High-reliability isolation drive circuit suitable for wide duty cycle for spacecrafts

Abstract

A high-reliability isolation drive circuit suitable for wide duty cycle for spacecrafts relates to the field of spacecraft high-voltage power system protection and design. The isolation drive circuitincludes a drive generation circuit, a drive enhancement circuit, a drive isolation module, a rectifier module and an MOS tube parallel circuit. The drive generation circuit generates two pulse drivecurrents. The drive enhancement circuit enhances the two pulse drive currents, and provides a drive current required for switching on MOS tubes. The drive isolation module isolates the drive circuit from a spacecraft power supply and expands the duty cycle. The rectifier module provides a path for the switch-on voltage and switch-off current for driving the MOS tubes. The MOS tube parallel circuitexpands the duty cycle. The problems of burnout caused by the requirement of the high-voltage spacecraft system that the MOS tubes should be out of control in the process of abnormal power failure, the requirement for duty cycle of 0-98% and serious EMC interference are solved, and the working reliability of the spacecraft power control equipment is improved.

Description

technical field [0001] The invention relates to the protection design field of a high-voltage power supply system of a spacecraft, in particular to a high-reliability isolation drive circuit suitable for a wide duty cycle for a spacecraft. Background technique [0002] With the development of aerospace technology, the load power of spacecraft continues to increase. In order to reduce system power transmission loss and improve the utilization rate of space energy, for spacecraft power systems with large load power, generally choose high-voltage power bus, such as 100V or 100V above the power bus. In the spacecraft of this kind of high-voltage bus power supply, the bus voltage of the general power system is higher than the battery voltage, and is not much different from the battery voltage, so the MOS tube in the control equipment between the bus and the battery is in a wide duty cycle switching state. [0003] Due to the high reliability requirements of the high-voltage powe...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a high-reliability isolation drive circuit suitable for a wide duty cycle for spacecraft, and to solve the high-voltage spacecraft system requirements that the MOS tube is in an out-of-control state during the abnormal power-off process and burns out , the duty cycle is required to be between 0% and 98%, and EMC interference is serious, which effectively improves the reliability of the spacecraft power control equipment

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