The invention discloses a power distribution self holding circuit applied to
missile-borne equipment and achieves self holding or
cutting of power supply signals of the
missile-borne equipment based on control instructions. The power distribution self holding circuit comprises electromagnetic relays K1-K6, and each
relay comprises two groups of normally-opened contacts and two groups of normally-closed contacts. A network
cutting control signal is connected with positive ends of solenoids B5 and B6, and negative ends of solenoids B1-B6 are connected to a power supply negative
signal. A main power supply negative
signal and the power supply negative
signal are connected to a
bus bar negative signal. Common ends COM5-1, COM5-2, COM6-1 and COM6-2 are short connected and then are connected with a grid connected
control signal and the positive ends of the solenoids B3 and B4. Normally-closed contacts K5-1, K5-2, K6-1 and K6-2 and normally-opened contacts K3-1, K3-2, K4-1 and K4-2 are short connected and then are connected with the positive ends of the solenoids B1 and B2. Common ends COM1-1, COM1-2, COM2-1 and COM2-2 are short connected and then are connected with a power supply positive signal and a
bus bar positive signal. Normally-opened contacts K1-1, K1-2, K2-1 and K2-2 are short circuited and then are connected to a main power supply positive signal. Common ends COM3-1, COM3-2, COM4-1 and COM4-2 are short connected and then are connected with the main power supply positive signal.