Reverse current detection circuit and method for sequential shunt regulating circuit

Abstract

The invention provides a reverse current detection circuit for sequential shunt regulating circuit (S3R). The reverse current detection circuit includes a bus diode D1, a reverse current sampling circuit, a protection circuit, a current limiting actuator, a current limiting inductance L1, a continuous current diode D2, a shunt MOS tube M1 and a shunt MOS tube M2, wherein the bus diode D1 and the reverse current sampling circuit are connected in series to a bus, one end of the reverse current sampling circuit is connected with an anode of the bus diode D1, the other end of the reverse current sampling circuit is connected with one end of the current limiting inductance L1, and the other end of the current limiting inductance L1 is connected with an anode of continuous current diode D2. Theinvention further provides a reverse current detection method for the sequential shunt regulating circuit (S3R). The reverse current detection circuit and method for the sequential shunt regulating circuit (S3R) have the beneficial effect of realizing short circuit protection of a single diode S3R circuit.

Description

technical field [0001] The invention relates to a reverse current detection circuit, in particular to a reverse current detection circuit and method for a sequence shunt regulation circuit. Background technique [0002] In the traditional S3R topology, two power diodes connected in series are connected to the busbar to avoid a short circuit from the busbar to ground due to the failure of one diode when the S3R is working. This kind of S3R has been used in the field of satellite power supply for many years due to its simplicity and reliability. [0003] With the passage of time, satellites have gradually improved the power supply efficiency requirements, so that the single-diode form S3R has been applied. This form of S3R has higher efficiency (≥99%) than the double-diode form. However, the risk of corresponding diode failure is also increased. Once the only diode short circuit fails, the bus will be short-circuited to ground through the MOSFET. If there is no protective meas...

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Problems solved by technology

However, the risk of corresponding diode failure is also increased. Once the only diode short circuit fails, the bus bar will be short-circuited to ground through the MOSFET. If there is no protective measure, the shunt MOSFET will be damaged by the short-circuit current of the bus bar to ground when it is turned on. Once a fault occurs on a running satellite, the bus of the entire star will be lost, and the satellite cannot work normally

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