Pulse by pulse current limit and phase current monitor for a pul

Details Pulse by pulse current limit and phase current monitor for a pul Pulse by pulse current limit and phase current monitor for a pul

1990-04-17

1992-06-30

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318432, H02P 517

Patent

active

051266474

ABSTRACT:
An average current measuring circuit (40) in accordance with the invention includes a first switch (42) connected between a pair of reference potentials which has a duty cycle which is controlled by a control signal which pulse width modulates current flowing through the switch to a load and varies the current flowing through the switch in frequency; a first current transformer (44) coupled to the current flowing through the first switch for producing an output signal proportional to the current flow; a sampling circuit (46), coupled to the output signal, for sampling current magnitude when the switch is turned on; and an averaging circuit (60) coupled to the sampling circuit, for producing an average signal of successive samples of a current flow through the load.

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