Differential driver for inductive load

摘要

A small and low-cost load driving circuit device that reduces common mode noise without using a transformer, has a first switching arrangement provided between a high potential source and a terminal of an electrical load; a second switching arrangement provided between ground and the other terminal of the electrical load; a control arrangement that controls the first and second switching arrangements so as to simultaneously disconnect each other with the same frequency and the same duty ratio; and a synchronization arrangement that synchronizes the disconnect timing of the first switching arrangement and the disconnect timing of the second switching arrangement.

主权项

1. A load driving circuit device that controls a supply of power to an electrical load, comprising:
a first switching arrangement connected between a terminal on a high potential side of a direct current power supply and a terminal of the electrical load; a second switching arrangement connected between a terminal on the low potential side of the direct current power supply and a further terminal of the electrical load; a control arrangement for controlling the first switching arrangement and second switching arrangement to disconnect each other simultaneously using respective PWM control signals having the same frequency and the same duty ratio; and a synchronization arrangement, comprising a first feedback circuit and a second feedback circuit, for synchronizing a disconnect timing of the first switching arrangement and a disconnect timing of the second switching arrangement wherein the first feedback circuit comprises a first capacitor in series with a first transistor and a second transistor, and the second feedback circuit comprises a second capacitor in series with a third transistor and a fourth transistor.