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Pre-charge of the powerline voltages in a high voltage DC application is a preliminary mode which limits the inrush current during the power up procedure. A high-voltage system with a large capacitive load can be exposed to high electric current during initial turn-on. This current, if not limited, can cause considerable stress or damage to the system components. In some applications, the occasion to activate the system is a rare occurrence, such as in commercial utility power distribution. In other systems such as vehicle applications, pre-charge will occur with each use of the system, multiple times per day. Precharging is implemented to increase the lifespan of electronic components and increase reliability of the high voltage system.
Intelligent lithium ion / sodium ion battery pack BMS management system
ActiveCN224267054UBatteries circuit arrangementsEmergency protective arrangements for automatic disconnectionHemt circuitsPre-charge
The utility model discloses an intelligent lithium ion / sodium ion battery group BMS management system, include: battery group, power MOSFET pipe circuit, AFE battery group voltage / current acquisition circuit, pre charge and discharge circuit, slave discharge circuit, main current sampling circuit, zero current calibration circuit, operational amplifier reference voltage source circuit, current and voltage sampling amplification circuit, central control circuit, charge and discharge current sampling circuit, power reference voltage source circuit, communication circuit, central control circuit corresponding end is respectively connected with AFE battery group voltage / current acquisition circuit, power MOSFET pipe circuit, current and voltage sampling amplification circuit, pre charge and discharge circuit, slave discharge circuit, charge and discharge current sampling circuit, power reference voltage source circuit, communication isolation module corresponding end electric connection. The utility model discloses a high -power MOSFET replaces traditional relay scheme, and the working current of all systems on BMS board is gathered, and the collection accuracy is better than 50uA, and the charge and discharge main loop current collection accuracy range is 1mA 3000A, ensures SOC correct when battery group long -term storage or working.
Owner:SHENZHEN HUAYAN JINGCHUANG TECH CO LTD