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Active Discharge Circuit for 800 V Systems

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AC05AT WSZ

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Active discharge is a method of discharging stored energy in a capacitor (or any other energy-storing element) in a controlled manner. This allows the system voltage to reach a safe value within a certain amount of time, thereby preventing the risk of electrical shock. Active discharge is distinguished from passive discharge or bleed resistors in such, that the discharge process is faster and actively initiated and therefore leads highe efficiency of the system during normal operation.

The solution uses an SiC MOSFET, driven by a photovoltaic gate driver, to enable discharge of a 800 V system through a pulse-prove resistor and can be easily tailored to the exact requriements.

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Active discharge is a method of discharging stored energy in a capacitor (or any other energy-storing element) in a controlled manner. This allows the system voltage to reach a safe value within a certain amount of time, thereby preventing the risk of electrical shock. Active discharge is distinguished from passive discharge or bleed resistors in such, that the discharge process is faster and actively initiated and therefore leads highe efficiency of the system during normal operation.

The solution uses an SiC MOSFET, driven by a photovoltaic gate driver, to enable discharge of a 800 V system through a pulse-prove resistor and can be easily tailored to the exact requriements.

Reference Design Files

Reference Board

Datasheet

Selected

AC05AT WSZ

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Reference

Functional Block Diagram

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Features

High pulse load surface-mounted wirewound resistors, carbon film MELF resistors, and thick film technology resistors

Low part count, isolated gate drive circuit without the need for an external power supply

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