BridgeSwitch with built-in IPH simplifies motor drive design and increases efficiency

BridgeSwitch high-voltage motor driver ICs have built-in motor phase current (IPH) detection capabilities, which can significantly simplify motor drive design, improve efficiency and optimize motor control accuracy. The benefits of built-in IPH detection are demonstrated in our concurrently released new design kit (RDK-964), which is now available to order from our website. Designed for brushless DC motor drives, this 300W three-phase inverter offers 97% efficiency and supports multiple types of microcontrollers (MCUs) for sensorless field-oriented control (FOC).

Watch video: How to eliminate shunts and op amps in motor drives

To accurately control the motor, current feedback information needs to be fed into a microcontroller running the control algorithm. Traditional circuits provide current feedback through a sense resistor, which consumes a lot of energy, and a signal processing circuit, which amplifies the current information and unnecessary noise.

Each BridgeSwitch IC integrates two N-channel power FREDFETs, as well as low-side and high-side drivers. It mirrors the phase current flowing through the low-side FREDFET on the IPH pin, thereby amplifying the signal internally. Not only does this reduce noise and energy loss, it also reduces the number of components associated with the current feedback circuit from more than 20 to just three (one small-signal resistor per BridgeSwitch IC).

Another advantage of BridgeSwitch's IPH function is that it can achieve twice the finer current information sampling resolution compared to traditional solutions, thereby greatly improving the accuracy of motor control.

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