Self-Powered Voltage Detection Circuit for Load Control
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Solution Overview
Problem
Existing electronic circuits for controlling voltage applied to loads are complex and expensive, making them undesirable for simple and cost-effective applications.
Innovation Solution
A simple electronic circuit with a controllable load switch element, voltage detection circuitry, and switch-on circuitry that uses a closed-loop control to maintain a constant average voltage at the load, eliminating the need for an external voltage supply and allowing for efficient energy use from batteries or accumulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a PWM control circuit is used to control voltage applied to a load, then the average voltage at the load can be varied, but the circuit becomes complex and expensive
Solution Approach 1:
The voltage detection circuitry is powered directly from the voltage applied to the load, eliminating the need for a separate external voltage supply. The circuit serves itself by using the load voltage to power its own detection components, thereby simplifying the overall circuit architecture and reducing component count while maintaining voltage control capability
Solution Approach 2:
The single switch element performs multiple functions: it controls the power supply to the load, powers the voltage detection circuitry, and enables the closed-loop control mechanism. This multi-functionality reduces the need for separate control circuits and external power supplies, thereby reducing circuit complexity
2Device complexity
If the voltage detection circuitry is powered by the voltage applied to the load, then the circuit becomes simpler and cheaper, but the circuit requires a determined period of time after initialization to become operational
Solution Approach 1:
The switch element is initialized in a predetermined switched-on state before normal operation begins. This preliminary action ensures that the voltage detection circuitry has sufficient time to become operational and detect the voltage applied to the load before the switch starts its normal switching cycle, thereby eliminating initialization delays during operation
3Power
If the load switch element is switched on and off repeatedly, then the average voltage at the load is reduced, but the load state varies with supply voltage fluctuations
Solution Approach 1:
The voltage detection circuitry continuously monitors the voltage applied to the load and provides feedback to control the switching of the load switch element. This closed-loop feedback mechanism adjusts the switching duty cycle to maintain a substantially constant average voltage at the load, compensating for supply voltage fluctuations and maintaining load state stability
Solution Approach 2:
The voltage detection circuitry is self-powered from the load voltage, enabling real-time monitoring and feedback control without requiring an external power supply. This self-service capability ensures continuous stabilization of the load state by automatically adjusting for supply voltage variations
Data Source
AI summary
The present invention is concerned with an electronic circuit that is connectable to a voltage source and a load. The circuit comprises a controllable load switch element that is arranged so that a supply voltage provided by the voltage source in a connected state is provided to the load when the load switch element is switched on and is not provided to the load when the load switch element is switched off and a voltage detection circuitry that in the connected state is coupled to the load so as to be energized by the voltage applied to the load. The circuit further comprises a switch-on circuitry that is coupled to the load switch element and is arranged to switch on the load switch element for a determined period of time after a switch arranged between the switch-on circuitry and the voltage source is closed. The proposed circuit allows for using a simple voltage detection circuit that is energized by the voltage to be measured by providing the switch-on circuitry.