Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-09-06
1994-05-10
Wambach, Margaret R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307494, 307359, 318377, 318375, 318254, G06G 712, H03K 5153
Patent
active
053110692
ABSTRACT:
The present invention provides driver circuitry for commutated inductive loads, and in particular, inductive loads employed in multi-pole DC brushless motors. The preferred embodiment of the present invention typically implements three pull-up and three pull-down drivers for motor control. The pull-down driver circuit described in the present invention can be configured to be adjusted by an external component of the integrated circuit implementation in order for controlling turn-off transients. Voltage transients due to changes in load current in the control loop of the pull-down driver circuit can be minimized or deterministically controlled by controlling the rate of change of the input voltage. For the case of when the load current is to be completely switched from one inductor to another inductor, an additional unity gain buffer coupled to the input voltage is inserted into the control loop of the pull-down driver circuit for reducing the voltage transients that can result. The output voltage rise and fall times of the pull-up driver circuit of the present invention can be controlled by means of an accurate clock rate, a capacitance ratio value, an arbitrary voltage supply or by any combination of the above means. The present invention also provides circuitry for controlling the pull-up driver circuit and the pull-down driver circuits as required to assert the floating operation and as well dynamic breaking operation. The present invention is able to assert these operations by operating from either the power supply or from an energy storage capacitor that is charged to a value closely approximating the power supply voltage should the power supply be removed.
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Silicon Systems Inc.
Wambach Margaret R.
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