Inductive Boost Converter Protection Circuit
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Solution Overview
Problem
Inductive boost converters face the risk of integrated circuits being burnt due to backward flow of charges when the diode is shorted, leading to hidden risks such as smoke and fire, as the stored charges flow back into the input terminal.
Innovation Solution
A protection circuit is introduced, comprising a detection circuit with an optical coupler and a control circuit with a shunt resistance, comparator, and field-effect tube, which detects short-circuit currents and cuts the connection between the charging circuit and ground to prevent charges from flowing backward, ensuring the safety of the inductive boost converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diode is shorted to improve current flow, then current transmission is improved, but charges flow backward into the input terminal causing integrated circuit damage
Solution Approach 1:
The patent introduces an optical coupler as an intermediary component between the transmission circuit and charging circuit. The optical coupler includes a light emitting diode that converts electrical signals to optical signals, and a triode that converts optical signals back to electrical signals. This intermediary optical coupling mechanism allows signal transmission while physically isolating the input terminal from backward charge flow, thus resolving the contradiction between current transmission reliability and preventing harmful backward charge flow.
2Power
If the control switch is turned off to increase output voltage, then voltage output is improved, but current soar occurs in the inductor
Solution Approach 1:
The patent implements preliminary protection actions by detecting short-circuit conditions before they cause damage. The detection circuit continuously monitors the transmission circuit for short-circuit conditions, and when detected, the control circuit preemptively adjusts the control switch duty cycle or turns it off to prevent current soar in the inductor. This preliminary detection and preventive control resolves the contradiction by preparing protective measures before the harmful effect occurs.
3Power
If the control switch is turned on to decrease output voltage, then voltage regulation is improved, but charges flow into the output capacitor through the diode causing voltage increase
Solution Approach 1:
The patent implements a feedback control mechanism where the detection circuit monitors the charging circuit's short-circuit condition and sends detection results to the control circuit. The control circuit adjusts the control switch duty cycle based on this feedback to regulate output voltage while preventing excessive charge accumulation in the output capacitor. This closed-loop feedback system resolves the contradiction by continuously adjusting operating parameters to maintain safe voltage levels while achieving voltage regulation.
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 protection circuit effectively prevents charges from flowing backward into the input terminal, thereby enhancing the security of the inductive boost converter and preventing damage to the integrated circuit, ensuring safe operation.
Implementation Method 1
a light emitting diode and a triode, a cathode of the light emitting diode and an anode of the diode of the transmission circuit are connected, an anode of the light emitting diode and the input terminal of the charging circuit are connected; the light emitting diode detects whether an input current from the transmission circuit is the short-circuit current, if the circuit is shorted, the light emitting diode will sent optical signals for triggering the triode to generate photocurrents
Implementation Method 2
the light emitting diode will sent optical signals for triggering the triode to generate photocurrents, resulting in turning on the triode
Data Source
AI summary
The invention provides a protection circuit applied in an inductive boost converter, the inductive boost converter includes a transmission circuit and a charging circuit, the protection circuit includes a detection circuit and a control circuit, an input terminal of the detection and an output terminal of the transmission circuit are connected, a first output terminal of the detection circuit and an input terminal of the charging circuit are connected, a second output terminal of the detection circuit and an input terminal of the control terminal are connected; the detection circuit detects whether an input current from the transmission circuit is a short-circuit current, if the circuit is shorted, the result will be sent to the control circuit, the control circuit cuts the connection of the charging circuit and ground, which can prevent charges stored in the charging circuit from flowing backward into the input terminal of the inductive boost converter.