Low-energy actuator diode detection circuit
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Solution Overview
Problem
Manufacturing errors such as missing or incorrectly polarized freewheeling diodes in low-energy actuators can lead to malfunction and potential fires, necessitating a reliable diode detection circuit that can operate with lower currents and reduce complexity and cost.
Innovation Solution
A low-side diode detection circuit using a current-limited voltage source, a low-energy actuator, and a switch-based peak detector coupled with an analog-to-digital converter to determine diode polarity, eliminating the need for comparators and digital filters, and utilizing low-voltage capacitors for frequency compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional diode detection circuits are used, then detection reliability is improved, but circuit complexity and cost increase
Solution Approach 1:
The patent extracts and removes unnecessary components (comparators, digital filters, high-voltage capacitors) from the traditional detection circuit, keeping only the essential elements (switch-based peak detector with ADC) needed for reliable diode detection, thereby reducing complexity while maintaining detection reliability
Solution Approach 2:
The patent replaces expensive, complex components with simpler, more cost-effective alternatives that can be easily integrated, such as using a switch-based peak detector with ADC instead of expensive comparator circuits, reducing both cost and complexity
2Measurement precision
If high current is used for detection, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic switching action in the peak detector circuit, where the switch alternates between connecting the capacitor to the detection node and disconnecting it, allowing accurate voltage measurement during the ON phase while consuming minimal energy during the OFF phase, thus achieving good detection accuracy with low energy consumption
Solution Approach 2:
The patent changes the detection parameter from direct current measurement to voltage measurement after capacitive storage, transforming the detection mode to achieve accurate diode status detection with minimal energy consumption by measuring the voltage across the capacitor rather than directly sensing current
3Speed
If voltage supply is increased, then detection speed is improved, but risk of voltage supply imbalance increases
Solution Approach 1:
The patent uses a single low-voltage supply for all circuit components, ensuring that all parts operate at the same voltage potential, which eliminates voltage supply imbalance issues while maintaining fast detection speed through optimized switching and capacitive measurement
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
The solution improves detectability, reduces circuit size and complexity, and minimizes the risk of voltage supply imbalances, ensuring accurate diode polarity detection and preventing potential fires, while being cost-effective and suitable for integration into larger systems like automobiles.
Implementation Method 1
the inductor acts essentially as a short so that current flows down from a positive terminal to a negative terminal. In a second state, the switch opens and suddenly reduces current flowing through the inductor. The inductor attempts to resist the sudden reduction in current by using its stored magnetic field energy to create its own voltage.
Implementation Method 2
Freewheeling diodes limit or eliminate that undesired electron arcing. Freewheeling diodes allow the inductor to draw current from itself in a continuous loop until the energy is dissipated through losses in the diode, a resistor, and wires.
Implementation Method 3
a peak detector coupled to the CLVS and the LEA, wherein the peak detector is a switch-based peak detector
Data Source
AI summary
A circuit comprises a CLVS, a LEA coupled to the CLVS, and a peak detector coupled to the CLVS and the LEA, wherein the peak detector is a switch-based peak detector. A method comprises closing a first switch for a period of time to provide a current to an actuator, opening the first switch after the period, measuring, after the opening, a voltage associated with the actuator, and determining, based on the measuring and using an ADC, whether a diode is present in the actuator and coupled with a correct polarity, is missing, or is present in the actuator and coupled with an incorrect polarity.