Abstract: A dimming device includes: a communication unit to receive a control signal for controlling a lighting state of an illumination load; a dimming circuit to dim the illumination load; a dimming circuit driving unit to control the dimming circuit to change a dimming level of the illumination load in response to the control signal; a relay connected between the illumination load and the dimming circuit; a relay driving unit to control on/off of the relay according to the control signal; a measurement unit configured to measure a load state of the illumination load and a control unit to cause the notification unit to notify the overload state, when it is determined by the measurement unit that the illumination load is in the overload state.

Abstract: A leakage detection breaker includes a current transformer configured to detect a leakage current, and a leakage determination unit configured to determine DC and AC leakages based on an output signal from the current transformer. The leakage detection breaker further includes a power supply cut-off unit configured to cut off a supply of DC or AC power when the current leakage determination unit determines the occurrence of the DC or AC leakage.

Abstract: A dimming device includes: a communication unit to receive a control signal for controlling a lighting state of an illumination load; a dimming circuit to dim the illumination load; a dimming circuit driving unit to control the dimming circuit to change a dimming level of the illumination load in response to the control signal; a relay connected between the illumination load and the dimming circuit; a relay driving unit to control on/off of the relay according to the control signal; a measurement unit configured to measure a load state of the illumination load and a control unit to cause the notification unit to notify the overload state, when it is determined by the measurement unit that the illumination load is in the overload state.

Abstract: There is provided an AC/DC two-way switch connected between an AC power source or a DC power source and a load to control a power supply to the load. The AC/DC two-way switch includes: a bi-directional semiconductor switch element having a transistor structure connected in series between a power source and the load; a rectifying unit connected in parallel between the first input terminal and a second input terminal; a power source unit for converting an output voltage from the rectifying unit into a stable voltage; and a controller for controlling an entire operation of the AC/DC two-way switch. The AC/DC two-way switch further includes a driving unit for turning on the bi-directional semiconductor switch element in response to a control signal.

Abstract: A driver includes a converter section 2 which includes a switching element Q1 and which is configured to output a desired DC voltage by switching the switching element Q1, a control section 1 configured to control the switching operation of the switching element Q1, capacitors C1A, C1B charged by the output of the converter section 2, turn-on circuits 31A, 31B configured to supply gates of a bidirectional switch element 4 using electric charges stored in the capacitors CIA, C1B with drive powers to turn-on the bidirectional switch element 4, and turn-off circuits 32A, 32B configured to discharge the capacitors CIA, C1B to turn-off the bidirectional switch element 4 in response to the halt of the switching operation of the switching element Q1 by the control section 1.

Abstract: A load control device includes a switching unit which is connected to a power source and a load in series and has a switch device having a transistor structure, a control unit configured to control start-up and stop of the load, and a gate driving unit, which is electrically insulated from the control unit and outputs a gate driving signal to the gate electrode of the switch device. The control unit controls the gate driving unit to supply a higher driving power to the gate electrode of the switch device for a predetermined period of time starting at the start-up of the load than that in a steady state.

Abstract: Providing a driver for semiconductor switch element capable of securing a sufficient drive power and reliably turning off the semiconductor switch element. The driver includes a converter section 2 which includes a switching element Q1 and which is configured to output a desired DC voltage by switching the switching element Q1, a control section 1 configured to control the switching operation of the switching element Q1, capacitors C1A, C1B charged by the output of the converter section 2, turn-on circuits 31A, 31B configured to supply gates of a bidirectional switch element 4 using electric charges stored in the capacitors C1A, C1B with drive powers to turn-on the bidirectional switch element 4, and turn-off circuits 32A, 32B configured to discharge the capacitors C1A, C1B to turn-off the bidirectional switch element 4 in response to the halt of the switching operation of the switching element Q1 by the control section 1.

Abstract: A load control device includes a switching unit which is connected to a power source and a load in series and has a switch device having a transistor structure, a control unit configured to control start-up and stop of the load, and a gate driving unit, which is electrically insulated from the control unit and outputs a gate driving signal to the gate electrode of the switch device. The control unit controls the gate driving unit to supply a higher driving power to the gate electrode of the switch device for a predetermined period of time starting at the start-up of the load than that in a steady state.

Abstract: A charging monitor has a switch disposed between a load section having a storage battery and an external AC power supply supplying a current to the load section via a plurality of lines and interrupts the supply of the current from the external AC power supply to the load section; a current detection circuit; a suppression circuit that suppresses a DC component contained in the detection signal; a filter circuit that filters a plurality of frequency components contained in the detection signal so that attenuation increases as a frequency becomes high; a rectifier smoothing circuit that rectifies and smoothens an output signal; and an electric leakage determination circuit that detects an electric leakage and shuts off the switch.

Abstract: There is provided an AC/DC two-way switch connected between an AC power source or a DC power source and a load to control a power supply to the load. The AC/DC two-way switch includes: a bi-directional semiconductor switch element having a transistor structure connected in series between a power source and the load; a rectifying unit connected in parallel between the first input terminal and a second input terminal; a power source unit for converting an output voltage from the rectifying unit into a stable voltage; and a controller for controlling an entire operation of the AC/DC two-way switch. The AC/DC two-way switch further includes a driving unit for turning on the bi-directional semiconductor switch element in response to a control signal.

Abstract: A charging monitor has: a switch that is disposed between a load section having a storage battery and an external AC power supply supplying a current to the load section via a plurality of lines and interrupts the supply of the current from the external AC power supply to the load section; a current detection circuit that outputs a detection signal corresponding to a difference in level between currents flowing through the lines; a suppression circuit that suppresses a DC component contained in the detection signal; a filter circuit that filters a plurality of frequency components contained in the detection signal so that attenuation increases as a frequency becomes high; a rectifier smoothing circuit that rectifies and smoothens an output signal obtained when the detection signal passes through the filter circuit and the suppression circuit; and an electric leakage determination circuit that detects an electric leakage and shuts off the switch when the level of the signal smoothened by the rectifier smoothin