Patent ID: 7358791
Filing Date: 2008-04-15
Classification: H02M

Abstract:
1. A discharge protection circuit for discharging a full-bridge circuit in a brushless DC fan, said brushless DC fan further comprising a control circuit for outputting at least one first control signal and at least one second control signal to said full-bridge circuit, said first control signal and said second control signal being reverse signals of each other, said discharge protection circuit comprising: a first impedance directly connected to the control circuit for receiving said first control signal; a second impedance connected to an input terminal of said full-bridge circuit for receiving the second control signal; and a switch having a first terminal and a second terminal; wherein said first terminal is connected to said first impedance for receiving said first control signal to control the status of said switch, said second terminal is connected to said second impedance for discharging said full-bridge circuit according to the status of said switch.