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KS-AMU Applications in New Energy Vehicles

KS-AMU Applications in New Energy Vehicles

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AMU (Arc Management Unit) intelligent active electronic arc management unit is designed for arc detection, arc extinguishing (suppression), protection, fault information recording during the breaking and closing of the new energy vehicle parts such as switches, connectors, fuses and conductors, which can ensure the electrical service life of the switches to survive the service life of the vehicles. It can eliminate the risk of spontaneous combustion caused by the arc, improve the reliability and safety of vehicles and reduce the number of high-voltage relays required, thus reducing costs. 
 
Main Functions
 
Precharging relay K2 closing and breaking arc extinguishing 
Precharging load LOAD0, arc extinguishing during the closing and breaking of main relay K1 and K3
Arc extinguishing during the closing and breaking of relay K4, K5 and K6 
Precharging load LOAD1, LOAD2 and LOAD3 (optional)
Breaking arc extinguishing of battery-precharged relay K7
 
 
SW:Power electronic switch group        
CAP:Energy storage capacitor
IN:Input port (It is used to input control signal of control coil of high voltage relay, which can be omitted when CAN bus is used or when closing arc extinguishing is not required.)
OUT:Output port         
CAN:Communication module (optional)
MCU:Microprocessor             
DC/DC:Power supply module
 
Operation Principles
 
The external input control signals for controlling K2 and K3 are respectively connected to INO and IN5 ports of AMU. AMU controls K2 and K3 through OUT 1 port and OUT2 port respectively, and uses AMU to control K2 and K3 to perform self – checking of the loop. 
 
When K1 is closed, AMU first controls K2 and K3 to close, SW charges capacitor CAP for energy storage and load LOAD0, then K1 is closed, K2 and K3 also remain closed in K1 closed state, and external input control signals of K1, K2 and K3 are connected to AMU.
 
AMU controls SW to output an energy pulse with extremely high rise rate to LOAD0 according to the voltage change rate of LOAD0 at the moment of K1 breaking, so that the voltage at two ends of K1 contacts is not greater than the arcing voltage, achieving the purposes of preventing contact burn-out and adhesion, and improving the electrical life of relay, and then AMU controls K2 to break without arcing.
 
During the closing of AMU K4 (K5, K6), SW first supplies LOAD1 (LOAD2 and LOAD3) with working power, and then K4 (K5 and K6) is closed, so that the relay has no arc or tiny arc, achieving the purposes of overcoming contact burning and adhesion, and improving the electrical life of the relay.
 
SW outputs an energy pulse with extremely high rising rate to LOAD1 (LOAD2 and LOAD3) according to the voltage change rate of LOAD1 (LOAD2 and LOAD3) at the moment of breaking K4 (K5 and K6), so that the voltage at two ends of the contact of K3 is not greater than the arcing voltage, thus achieving the purposes of preventing contact burn-out and adhesion, and improving the electrical life of the relay.
 
When it’s required to extinguish the arc of battery charging relay K7, the control strategy requires K2 and K3 to be in the closed state, the energy pulse is supplied to the battery through K2 from AMU.
 
Main Technical Data
 
SW power electronic switch group
Withstand voltage > 1800 VDC
Leakage current < 1 mA (typical < 0.1 mA)   
Withstand current: 1000 A/ 500 μs
 
CAP Energy storage capacitor
Max. allowable output current: 1000 A
Withstand voltage > 1200 VDC
 
Insulation withstand voltage: 2000 VDC
Power consumption: 2 W
Ambient temperature: -40 ~ +85°C
 
Note: Considering the safety and gas leakage risks, it’s not recommended to use sealed inflatable relays.