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US07948194B2 Waveform current monitor using RDSon of low-side bridge FET 失效
使用低侧桥式FET的RDSon的波形电流监视器

Waveform current monitor using RDSon of low-side bridge FET
Abstract:
An apparatus for monitoring current for a motor drive including at least high-side and low-side switching transistors includes a driver circuit for driving a gate of the low-side switching transistor. First circuitry measures a drain to source voltage across the low-side switching transistor and generates a voltage output responsive thereto. Second circuitry has a first state of operation that samples the voltage output of the first circuitry when the low-side switching transistor is turned on and has a second state of operation to sample the voltage output of the first circuitry when the low-side switching transistor is turned off. The second circuitry further generates a monitored output current responsive to the sampled voltage output.
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