Stable Power Supply Device for High Voltage Battery Systems
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Solution Overview
Problem
High voltage battery systems in vehicles face instability and increased repair costs due to damage from overcurrent issues with conventional high capacity resistors used for precharge, which can lead to ignition failures and potential electric shocks from residual capacitor power.
Innovation Solution
A stable power supply device utilizing a heat generating resistor of a temperature raising system to gradually increase capacitor voltage at ignition and discharge remaining power after ignition, eliminating the need for a separate high capacity resistor and reducing costs by integrating the heat generating resistor as both a precharge and temperature raising component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high capacity resistor is used for precharge to supply stable power to high voltage components, then power stability is improved, but the resistor may be damaged due to overcurrent, leading to increased repair costs and ignition failures
Solution Approach 1:
The patent merges the precharge resistor function with the temperature raising system resistor by electrically connecting the temperature raising system resistor to the positive and negative terminals of the high voltage battery through relays. This combined resistor serves dual purposes: precharging capacitors in high voltage components and raising battery temperature, thereby eliminating the need for a separate high capacity resistor and reducing overcurrent damage risks.
Solution Approach 2:
The temperature raising system resistor is given multiple functions: it acts as both a precharge resistor for stabilizing power during ignition and a temperature raising element for heating the high voltage battery. This multi-functionality reduces component count and eliminates the vulnerability of single-function high capacity resistors to overcurrent damage.
2Reliability
If a separate high capacity resistor is installed for precharge, then power stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the precharge resistor function with the temperature raising system resistor by electrically connecting the temperature raising system resistor to the positive and negative terminals of the high voltage battery through relays. This combined resistor serves dual purposes: precharging capacitors in high voltage components and raising battery temperature, thereby eliminating the need for a separate high capacity resistor and reducing overcurrent damage risks.
Solution Approach 2:
The temperature raising system resistor is given multiple functions: it acts as both a precharge resistor for stabilizing power during ignition and a temperature raising element for heating the high voltage battery. This multi-functionality reduces component count and eliminates the vulnerability of single-function high capacity resistors to overcurrent damage.
3Duration of action of stationary object
If high voltage components remain powered after ignition off, then component operation is maintained, but safety risk increases due to potential electric shock from residual capacitor power
Solution Approach 1:
The patent introduces the temperature raising system resistor as an intermediary discharge path for capacitor energy after ignition is turned off. By controlling relays to connect the capacitor to the resistor, the residual energy is safely dissipated as heat, preventing electric shock hazards while maintaining system control through the relay switching mechanism.
Solution Approach 2:
The patent converts the harmful residual capacitor energy into a beneficial heating effect by directing it through the temperature raising system resistor. The energy that would otherwise pose an electric shock risk is transformed into controlled heat dissipation, simultaneously enhancing safety and potentially providing additional battery thermal management.
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
This solution prevents resistor damage from overcurrent, reduces costs by eliminating the need for a separate precharge resistor, and ensures system stability by quickly discharging residual capacitor power, thereby enhancing safety and reliability.
Implementation Method 1
a precharge heat generating resistor installed in the first branch circuit, the precharge heat generating resistor preventing a sudden flow of current by delaying an increase in voltage at an initial stage of ignition
Implementation Method 2
uses a heat generating resistor of a temperature raising system to gradually increase capacitor voltage at ignition and discharge remaining power after ignition
Data Source
AI summary
A stable power supply device for a high voltage battery system in a vehicle enables the voltage of a capacitor in a high voltage component to be gradually increased at an initial stage of ignition, using a heat generating resistor of a temperature raising system mounted to raise the temperature of a battery in the vehicle. Further, the stable power supply device enables a capacitor in a high voltage component to be discharged using a heat generating resistor of a temperature raising system after the ignition of the vehicle is off, thereby ensuring the stability of the system.