R/C speed controller with synchronous flyback circuit

Details R/C speed controller with synchronous flyback circuit R/C speed controller with synchronous flyback circuit

1999-06-28

2000-10-10

Martin, David

Electricity: motive power systems

Supplied or controlled by space-transmitted electromagnetic...

318139, 318380, 446456, H02P 710

Patent

active

061305138

ABSTRACT:
A radio controlled (R/C) speed controller with a synchronous flyback circuit includes a first node for connection to a first battery terminal and a first motor terminal, a second node for connection to a second battery terminal, and a third node for connection to a second motor terminal. A drive subcircuit is connected between the second and third nodes for switching between a DRIVE ON state a DRIVE OFF state, a brake subcircuit is connected between the first and third nodes for switching between a BRAKE ON state and a BRAKE OFF state, and a control subcircuit switches the drive and brake subcircuits under program control. The brake subcircuit includes a diode that is connected across the first and third nodes in order to conduct flyback current, the control subcircuit includes a sensing subcircuit for sensing when the diode is forward biased beyond a predetermined threshold level as an indication that the diode is conducting the flyback current, and the control subcircuit is programmed to switch the brake subcircuit to the BRAKE ON state in synchronism with the diode being forward biased beyond the predetermined threshold level in order to thereby more efficiently conduct the flyback current.

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patent: 5903130 (1999-05-01), Rice et al.
patent: 5925992 (1999-07-01), Orton

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