Power Supply Switch Control for Parasitic Diode Current Faults
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Solution Overview
Problem
Existing power supply control devices can fail due to short circuits between semiconductor switches, leading to abnormal temperature increases and potential failures in other semiconductor switches, especially when the first semiconductor switch is off and current flows through its parasitic diode.
Innovation Solution
A power supply control device with a processing unit and switching circuit that switches the first semiconductor switch on if current flows through the path despite instructions to switch both switches off, preventing prolonged current flow through the parasitic diode and thus avoiding failures in the first semiconductor switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both semiconductor switches are switched off to stop current flow, then power supply control is achieved, but current may still flow through parasitic diodes in case of short circuits or incorrect battery connection
Solution Approach 1:
The control device continuously monitors the circuit conditions and detects when current flows through parasitic diodes despite both switches being off. Upon detection of abnormal current flow or short circuit conditions, the control device activates the appropriate switch to block the parasitic current path, maintaining both efficiency and reliability
Data Source
AI summary
A power supply control device controls power supply by switching on or off a first semiconductor switch and a second semiconductor switch that are arranged on a current path. A first diode and a second diode are connected between a drain and a source of the first semiconductor switch and the second semiconductor switch, respectively. Cathodes of the first diode and the second diode are arranged downstream and upstream of the respective anode on the current path. If current flows through the current path even though a microcomputer has given an instruction to switch the first semiconductor switch and the second semiconductor switch off, a first drive circuit switches the first semiconductor switch on.