Switching Regulator Inductance Detection Circuit
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Solution Overview
Problem
Conventional switching regulators lack an appropriate protection mechanism to prevent damage from improper usage of outside components, such as incorrectly chosen resistors or inappropriate inductance, leading to potential malfunction or overvoltage issues.
Innovation Solution
A device and method for inductance detection using a controller, current pulse generator, and detector to generate and analyze a reflective signal, determining if the outside component is an inductor or resistor within a correct impedance range, and enabling or disabling the switching regulator accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switching regulator is used without component verification, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates due to potential component misuse and overvoltage damage
Solution Approach 1:
The system performs preliminary detection of the external inductor before enabling the switching regulator to operate. The controller generates a detection signal and measures the impedance of the external component to verify it is an inductor with appropriate inductance value before allowing normal operation, preventing component misuse damage
Solution Approach 2:
The system implements a feedback mechanism where the detector measures the impedance of the external component and feeds this information back to the controller. Based on the feedback, the controller determines whether to enable or disable the switching regulator, ensuring reliable operation
2Power
If an external inductor is used for voltage transformation, then the power transformation efficiency is improved, but the object-generated harmful factors worsen due to potential overvoltage damage to the switching regulator
Solution Approach 1:
The system applies preliminary anti-action by detecting the impedance of the external inductor before operation and comparing it with the expected range. If the impedance is outside the acceptable range, the controller prevents the switching regulator from operating, thereby counteracting the potential overvoltage damage before it can occur
3Volume of moving object
If passive components are made smaller to reduce volume, then the volume of the portable electronics product is reduced, but the ease of operation worsens due to difficulty in detecting and measuring component correctness
Solution Approach 1:
The system replaces manual or visual inspection methods with an automated electrical measurement system. The controller generates detection signals and the detector measures the impedance of the external component electrically, automatically determining whether it is an inductor with appropriate inductance value, making the detection process independent of component size
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
Prevents damage by accurately identifying and protecting against misuse of components, ensuring the switching regulator operates within safe parameters and avoids overvoltage situations.
Implementation Method 1
The current pulse generator is coupled to the controller and generates a current pulse signal to the object according to the control signal
Implementation Method 2
The detector is coupled to the object and the current pulse generator, and is used to detect a reflective signal responded by the object after the object receives the current pulse signal
Data Source
AI summary
A device of inductance detection, which includes: a controller, a current pulse generator, and a detector. The controller generates a control signal and an enable signal to the switching regulator according to a judge signal. The switching regulator then generates an output voltage. The current pulse generator is coupled to the controller and generates a current pulse signal to the object according to the control signal. The detector is coupled to the object and the current pulse generator, and is used to detect a reflective signal responded by the object after the object receives the current pulse signal. The detector then generates a judge signal according to the reflective signal.