Patent ID: 7733619

Claim:
An overcurrent breaking controller for a lamp and lantern, one terminal of which is connected in series to a load and the other terminal is connected to AC power, comprises: a current transformer, one terminal of which is connected to the AC power, mainly comprising a primary coil with small number of coils, and a secondary coil with large number of coils, the primary coil being connected to the AC power; an overcurrent restraint unit being connected to the other terminal of current transformer and mainly comprising a half wave rectifier voltage division circuit, a voltage regulator circuit, a Silicon-Controlled Rectifier (SCR), and a bridge rectifier, in which Anode of the SCR is connected to the bridge rectifier and further to a DIAC of the trigger control unit, a terminal of the DIAC that is connected to a charging and discharging capacitor is connected to the bridge rectifier, Gate of the SCR is connected to the half wave rectifier voltage division circuit through the connected voltage regulator circuit, and the other terminal of the half wave rectifier voltage division circuit is connected to the secondary coil of current transformer; a phase delay unit, one terminal of which is connected to the half wave rectifier voltage division circuit and the other terminal of which is connected to the Anode terminal of SCR of the overcurrent restraint unit, in which when the SCR of the overcurrent restraint unit turns ON, the zero voltage generates a delay time constant Δt; a time setting unit, one terminal of which is connected to Anode of the SCR of the overcurrent restraint unit and the other terminal of which is connected to the bridge rectifier, in which the SCR of the overcurrent restraint unit may be detected and then the time setting unit generates a ground loop after determined time to make a circuit between the load and the AC power stay open; and a trigger control unit, one terminal of which is connected to the overcurrent restraint unit and the other terminal of which is connected to the load, mainly comprising a DIAC and a TRIAC, in which one terminal of the DIAC is connected to the bridge rectifier and the other terminal is connected to Gate of the TRIAC the other terminal of which is connected to the load.