The lead-acid electric car six-light charger is a critical device for charging electric vehicles. These chargers are typically equipped with multiple protection mechanisms, among which over-temperature protection and over-current protection are core safeguards for their safety performance.
Working Principle and Trigger Conditions of Over-Temperature Protection
Over-temperature protection is designed to prevent the charger from being damaged or causing safety hazards due to excessive heat during the charging process. When the lead-acid electric car six-light charger is in operation, internal electronic components (such as transformers, MOS tubes, rectifiers, etc.) generate heat. If heat dissipation is poor or the ambient temperature is too high, the charger's temperature may rise sharply, affecting its performance or even causing a fire.
The core of over-temperature protection lies in the use of temperature sensors to monitor the temperature of key internal parts in real time. When the temperature reaches a preset safety threshold (usually between 70°C and 85°C), the charger's control circuit will immediately cut off the output current and stop charging. Once the temperature drops back to a safe range, the charger will automatically resume operation.
Common scenarios that trigger over-temperature protection include:
Prolonged high-load operation of the charger with poor heat dissipation;
High ambient temperatures, such as during summer heat;
Malfunction of the charger's internal fan or blockage of the heat dissipation channels;
Poor connection between the charger and the battery, leading to increased contact resistance and additional heat generation.
Working Principle and Trigger Conditions of Over-Current Protection
Over-current protection is designed to prevent the charger's output current from exceeding the capacity of the battery or the charger itself, thereby avoiding risks such as battery overcharging, charger damage, or even short circuits. Lead-acid batteries have strict requirements for charging current, as excessive current can cause corrosion of the battery plates, drying of the electrolyte, and shortened battery life.
Over-current protection works by using a current detection circuit to monitor the output current in real time. When the output current exceeds the rated value (e.g., 5A), the charger's control circuit will quickly reduce or cut off the output current to protect the battery and the charger. Some high-end chargers also dynamically adjust the output current based on the battery's charging state for more precise protection.
Common scenarios that trigger over-current protection include:
Internal short circuits or damage to the battery, causing abnormal increases in charging current;
Incorrect connection between the charger and the battery, such as reversed polarity;
Short circuits at the charger's output end, such as damaged or poorly connected charging cables;
Aging of the battery or insufficient electrolyte, leading to increased internal resistance and unstable charging current.
Synergistic Effect of Over-Temperature and Over-Current Protection
Over-temperature protection and over-current protection often work in synergy. When the lead acid battery charger reduces its output current due to over-current protection, its internal temperature will also decrease, thereby reducing the likelihood of triggering over-temperature protection. Conversely, if the charger stops working due to over-temperature protection, its output current will also be cut off, indirectly achieving over-current protection. This dual protection mechanism significantly enhances the safety and reliability of the charger.
Tianchang Chaochen electronic Technology Co., LTD. specializes in the production of electric bicycle battery chargers, motorcycle battery chargers, lithium battery chargers, power adapters, various lead-acid battery chargers, various lithium battery chargers, high-power battery pack chargers, and various agricultural machinery battery chargers, with over 1,000 models available. Our products are sold across five continents. If you are in need of a lead-acid electric car six-light charger, please feel free to contact us.
