Power Circuit Logic Determination Circuit Abnormal Signal Detection
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Solution Overview
Problem
Conventional switch power circuits lack a self-protection function, leading to chain reactions where component failures can cause additional components to burn out, especially in adverse environments or due to operation errors.
Innovation Solution
A power circuit with a self-protection function that includes a logic determination circuit to detect abnormal signal relations among PWM, UGATE, and LGATE signals, disabling the logic control circuit and preventing further damage by using a control unit, logic control circuit, first and second driver amplifiers, and a logic determination circuit to assess and respond to abnormal logical relations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switch power circuit is used without self-protection function, then the circuit structure is simple, but component failures can cause chain reactions and burn out other components
Solution Approach 1:
The logic determination circuit performs preliminary detection of signal logical relations before failures can propagate. By continuously monitoring whether PWM, UGATE, and LGATE signals meet expected logical relations, the system identifies abnormal states early and disables the logic control circuit proactively, preventing chain reactions before they occur.
Solution Approach 2:
The logic determination circuit acts as an intermediary between the driver circuit and the logic control circuit. It monitors the logical relations of signals and, when abnormalities are detected, generates a disable signal to the logic control circuit, thereby isolating the fault and preventing it from affecting other components through the normal control path.
2Reliability
If no logic determination circuit is added, then the device complexity is low, but the power circuit cannot detect abnormal states and prevent chain reactions
Solution Approach 1:
The logic determination circuit establishes a feedback mechanism by continuously monitoring the logical relations of PWM, UGATE, and LGATE signals and comparing them against expected relationships. When the logical relation becomes abnormal, the circuit generates feedback to disable the logic control circuit, creating a closed-loop protection system that automatically responds to detected anomalies.
3Reliability
If the logic control circuit is disabled upon detecting abnormal logical relations, then component protection is achieved, but the power circuit stops operation
Solution Approach 1:
The abnormal logical relation, which initially represents a harmful fault condition, is converted into a beneficial protection mechanism. By detecting the abnormal logical relation between PWM, UGATE, and LGATE signals, the system transforms the fault indication into an automatic disable command that protects components from further damage, turning a potentially destructive event into a protective action.
Data Source
AI summary
A power circuit includes a control unit, a logic control circuit, a first driver amplifier, a second driver amplifier and a logic determination circuit. The control unit is used to output a pulse width modulation (PWM) signal and an enable (EN) signal. The logic control circuit receives the PWM signal and the EN signal, and outputs a first voltage signal and a second voltage signal. The first driver amplifier receives the first voltage signal, and outputs a first gate (UGATE) drive signal. The second driver amplifier receives the second voltage signal, and outputs a second gate (LGATE) drive signal. The logic determination circuit receives the PWM signal and the first and second gate drive signals. When the PWM signal and the first and second gate drive signals meet an abnormal logical relation, the logic determination circuit disables the logic control circuit.