Dual fault-tolerant chopper circuit for driving magnetic levitation electromagnet

摘要

a to always detect a failure of the power switching device, the operating state of the power switching device malfunctions during operation status blocking the power switching device from the circuit and the standby state power switching device is driven to pay for magnetic levitation electromagnets to operate Wall redundant chopper circuit is disclosed. First chopper input pulse width modulating the current supplied to the load inductor pair of the first power switching device controlled in accordance with the signal, a pair of a pair of first connected between a first power switching device and the inductor each load resistance element, and the pair of determining whether the first occurrence of the failure of the pair of power switching device by detecting a voltage signal across the first resistive element and thereby on / off control is a pair of current supply to the load inductor comprises of a first solid-state electronic switch. A second chopper connected between a pair of a pair of the first power switching device and each of a pair of complementary action in the second power switching devices, a pair of second power switching devices and inductive loads, each of the first chopper determining a second resistive element, and a pair of a failure or absence of the second resistance element in the voltage across the pair of second power switching device by detecting a signal, and is in accordance with the on / off thereby controlling the current supply to the load inductor which includes a pair of second solid state electronic switch.