Power Supply Surge Suppression Circuit with Relay-Resistor Bypass
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Solution Overview
Problem
Existing high-current power supply circuits for electric vehicles suffer from relay malfunction due to hardware control circuit damage, leading to potential module damage and surge currents upon switch-on.
Innovation Solution
A circuit with a relay connected in parallel to a variable resistance, controlled by a microcontroller and voltage detection module, adjusts the relay and resistance connection based on output voltage to manage surge currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a relay is completely controlled by a hardware control circuit, then the relay can be simply controlled, but the relay cannot work properly due to damages to any component in the hardware control circuit
Solution Approach 1:
The patent replaces the hardware control circuit with a microcontroller-based software control system. The microcontroller monitors the circuit state and controls the relay through software logic, eliminating the need for complex hardware control circuits with multiple components that are prone to damage. This substitution maintains ease of control while significantly improving reliability.
Solution Approach 2:
The patent introduces a microcontroller as an intermediary between the power supply module and the relay. The microcontroller acts as a smart mediator that processes circuit state information and makes intelligent control decisions, replacing the direct hardware control path and providing fault tolerance through software-based error handling and protection mechanisms.
2Speed
If a switch is powered on directly, then the power supply can start quickly, but a high surge current is generated
Solution Approach 1:
The patent implements preliminary monitoring and control actions before the power supply fully starts. The microcontroller detects the circuit state in advance and prepares the relay control strategy, allowing the system to start quickly while preventing surge currents through pre-planned control sequences and gradual power application.
Solution Approach 2:
The patent employs feedback control where the microcontroller continuously monitors the circuit state and power supply parameters, then adjusts the relay control in real-time. This closed-loop feedback mechanism detects potential surge conditions and responds by modulating the relay activation, maintaining fast startup while suppressing harmful surge currents through dynamic adjustment.
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
Effectively suppresses surge currents, protecting the power supply module and other components by reducing relay malfunction risks and ensuring stable operation.
Implementation Method 1
a variable resistance, and the relay is connected in parallel to the variable resistance and then connected between an external power supply and the power supply module
Implementation Method 2
the relay is connected in parallel to the variable resistance and then connected between an external power supply and the power supply module
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure provides a circuit and method for suppressing a power supply starting surge, a charging apparatus, and a storage medium. The circuit for suppressing a power supply starting surge includes: a power supply module, a relay, and a variable resistance. The relay is connected in parallel to the variable resistance and then connected between an external power supply and the power supply module. According to the present disclosure, the variable resistance is connected in parallel to both ends of the relay, so that a power supply starting surge can be effectively suppressed, the power supply module is controlled to output an appropriate power supply voltage, and normal operation of components in the circuit can be protected.