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Working principle of the pre-charging circuit of the energy storage high voltage box

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Working principle of the pre-charging circuit of the energy storage high voltage box [PDF]

6 FAQs about [Working principle of the pre-charging circuit of the energy storage high voltage box]

How does pre-charge work?

At system power on, the controller in battery management system (BMS) disconnects the positive contactor first, and then powers the pre-charge units including pre-charge contactor and precharge resistor. The inrush current flows entirely through the pre-charge circuit, to slowly charge the downstream capacitor.

How does a pre-charge circuit function?

A pre-charge circuit works by allowing the inrush current to flow through it to slowly charge the downstream capacitor. Once the capacitor voltage reaches close to the battery voltage, the controller turns on the positive contactor, and then cuts off the pre-charge contactor, allowing all of the system current to pass through the main relay.

Why are pre-charge circuits necessary in high voltage systems?

Pre-charge circuits are necessary in high voltage systems in electric vehicles because they prolong the lifespan of the main relays and other electrical components dramatically by charging the DC link capacitor before the main contactor switches on.

Why do I need to pre-charge a DC high voltage power system?

Pre-charging the DC high voltage power system is necessary to limit inrush current at system power-up. Such large inrush current can exceed the nominal load current, often causing the burn-out of power system or closing switch contacts, and resulting in electric shock to the entire high-voltage circuits.

What is precharge circuit in EV HV System?

In an EV's high-voltage system, a precharge circuit is composed of a relay (precharge contactor) and a resistor. These components are wired in parallel and installed on the positive leg, in series with the main relay.

What does a pre-charge resistor protect against?

A pre-charge resistor integrates compressor energy storage protection circuit, reverse voltage protection circuits, residual voltage discharging circuit, and capacitive load precharge circuit to meet the pre-charging of electric compressor during the power-up procedure.

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