Hybrid circuit breaker and pre-charge control method

A pre-charge control method for a DC circuit system, the DC circuit system comprising a switch circuit, a power source and a capacitor module, the switch circuit connected between the power source and the capacitor module, and the pre-charge control method comprising:

• providing the switch circuit, wherein the switch circuit comprises at least one electronic switch and at least one clamping circuit;
• controlling the at least one electronic switch in an off state;
• controlling the at least one electronic switch to turn on according to a pre-charge command;
• detecting a charging current flowing into the switch circuit;
• controlling the at least one electronic switch to turn off when the charging current reaching a limit current value, wherein the charging current is gradually reduced due to the limitation of the at least one clamping circuit;
• controlling the at least one electronic switch to turn on according to a pre-charge signal;
• and
• controlling the switch circuit to turn on when reaching a pre-charge end condition.

A pre-charge control method for a three-phase AC circuit system, and the three-phase AC circuit system comprising a first hybrid circuit breaker, a second hybrid circuit breaker, a third hybrid circuit breaker and an AC power source, the AC power source providing a three-phase voltage and comprising a first phase terminal, a second phase terminal and a third phase terminal, and the pre-charge control method comprising:

• providing a first phase voltage of the three-phase voltage to the first hybrid circuit breaker through the first phase terminal, providing a second phase voltage of the three-phase voltage to the second hybrid circuit breaker through the second phase terminal, and providing a third phase voltage of the three-phase voltage to the third hybrid circuit breaker through the third phase terminal;
• controlling the first hybrid circuit breaker, the second hybrid circuit breaker and the third hybrid circuit breaker in an off state;
• controlling the first hybrid circuit breaker to turn on when the first phase voltage of the three-phase voltage is equal to zero;
• controlling the second hybrid circuit breaker to turn on when the first phase voltage of the three-phase voltage is equal to the second phase voltage of the three-phase voltage;
• controlling the third hybrid circuit breaker to turn on when the third phase voltage of the three-phase voltage is equal to zero.