Radiation-proof self-recovery over-current/short-circuit protection circuit for satellite

Abstract

The invention relates to a radiation-proof self-recovery over-current / short-circuit protection circuit for a satellite. On the basis of a line structure, the self-recovery over-current / short-circuit protection function is realized. Moreover, the circuit has advantages of reasonable design, small size, and light weight. The radiation-proof self-restoring over-current / short-circuit protection circuit is composed of a power supply module, a triode driver module, a VDMOS tube module including a VDMOS tube Q2, a current detection, amplifier and comparator module, a trigger feedback module having a D trigger U3, and a precision sampling resistor RS1 connected in series to a bus. The power supply module is used for providing power for the current detection, amplifier and comparator module and the trigger feedback module through buses. The input terminal of the triode driver module is connected with an input signal of the control circuit and the output terminal is connected with a gate terminal of the VDMOS tube Q2; and a source end of the VDMOS tube Q2 is connected with the bus by the precision sampling resistor RS1 and a drain end is grounded by a resistor R13. The current detection, amplifier and comparator module consists of a current detection chip U1 for current detection and signal amplification and a comparator U2.

Description

technical field [0001] The invention relates to the design technology of semiconductor hybrid integrated circuits, in particular to an anti-radiation self-recovery overcurrent / short circuit protection circuit for satellites. Background technique [0002] The spacecraft and its internal equipment need a precise temperature control system to ensure the effectiveness and reliability of its work. Therefore, it is necessary to design a heater drive control circuit with over-current / short-circuit protection to protect the busbar, so as to ensure that each The safety and reliability of the work of the instrument and equipment. The over-current / short-circuit protection function of the traditional star circuit is implemented by discrete devices, and the circuit is protected by a fuse for over-current. Due to the particularity of the satellite circuit, the circuit is required to have the characteristics of anti-radiation, overcurrent / short circuit protection and recovery, so the trad...

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Problems solved by technology

[0006] 2. The realization of the overcurrent / short circuit protection function depends on the fuse, and the overcurrent protection state cannot be self-recovered;

However, it cannot be self-recovered after the fuse is blown, and the fuse needs to be replaced manually, which is poor in operability for star circuits

[0008] 3. The anti-irradiation performance cannot meet the requirements of satellite circuits;

[0009] Due to the difficulty and high cost of purchasing imported chips of anti-irradiation VDMOS tubes for core components, there is no anti-irradiation current detection chip at home and abroad.

Therefore, the cost of the circuit that satisfies the overall anti-radiation characteristics of the circuit is high, and it cannot meet the use requirements of a large-scale satellite circuit

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