Voltage Converter Control Circuit for Reverse Voltage Protection
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Solution Overview
Problem
Conventional power supply circuits fail to promptly cut off the driving switch during instantaneous output voltage increases, leading to potential damage to circuit elements, and are unable to immediately turn off the switch when input voltage is zero or high impedance, also causing damage.
Innovation Solution
A voltage converting circuit with a control circuit that includes a voltage status comparator and a control signal generator, which compares input and output voltages to generate a control signal to turn the driving switch on or off, effectively activating a reverse voltage protection mechanism by detecting voltage statuses and generating a bias voltage to quickly turn off the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a de-bouncing operation with a range of 2-10 ms is performed to avoid miss operation, then false triggering is reduced, but the response time to cut off the driving switch during instantaneous output voltage increases becomes too slow, causing potential damage to circuit elements
Solution Approach 1:
The control circuit preliminarily prepares multiple control signals including a first control signal for normal operation and a second control signal for rapid shutdown. When reverse voltage is detected, the system immediately switches to the pre-prepared second control signal, eliminating the need for de-bouncing delay and enabling instant protection of circuit elements.
Solution Approach 2:
The control circuit dynamically adjusts its response based on voltage conditions. It monitors the relationship between input and output voltages in real-time and transitions between different control modes: normal operation mode with de-bouncing for stability, and rapid shutdown mode for protection, thereby optimizing both reliability and speed under different conditions.
2Stability of the object's composition
If the conventional power supply circuit uses a fixed de-bouncing time range of 2-10 ms, then operational stability is maintained under normal conditions, but the circuit cannot immediately respond when input voltage is zero or high impedance, leading to damage
Solution Approach 1:
The control circuit implements dynamic control by switching between different control signals based on detected voltage conditions. Under normal conditions, it uses the first control signal with de-bouncing for stability. When reverse voltage is detected (output voltage exceeds input voltage or input voltage is zero/high impedance), it immediately switches to the second control signal for rapid shutdown, thereby maintaining both stability and protection capability.
Solution Approach 2:
The system changes the control parameter (control signal) based on the detected voltage status. It monitors whether the output voltage exceeds the input voltage and adjusts the control signal accordingly, transitioning from a stable operation parameter to a protection parameter, thereby adapting to different operational conditions and ensuring circuit safety.
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 enables rapid activation of the reverse voltage protection mechanism, preventing damage to circuit elements by opportunistically turning off the driving switch during reverse voltage phenomena, ensuring the safety and stability of the voltage converting circuit.
Implementation Method 1
The voltage status comparator compares a voltage value of the output voltage and a voltage value of the input voltage or the base voltage according to a voltage status of the input voltage, and generates a comparison result
Implementation Method 2
The control signal generator generates a control signal according to the bias voltage and transmits the control signal to a control terminal of the driving switch, where the driving switch is turned on or turned off according to the control signal
Data Source
AI summary
A voltage converter and a control circuit thereof are provided. The control circuit includes a voltage status comparator and a control signal generator. The voltage status comparator receives an input voltage and an output voltage, and provides a base voltage. The voltage status comparator compares voltage values of the output voltage and the input voltage or compares voltage values of the output voltage and the base voltage according to a voltage status of the input voltage, and generates a comparison result. The voltage status comparator generates a bias voltage according to the comparison result. The control signal generator generates a control signal according to the bias voltage and transmits the control signal to a control terminal of a driving switch, where the driving switch is turned on or cut off according to the control signal.