Abstract: A test signal is applied from a continuity test source to a photovoltaic (PV) panel string, to test electrical continuity in the PV panel string and between the PV panel string and an inverter that is coupled to the PV panel string. If the test signal is detected at a PV panel disconnect switch that is separate from the continuity test source and switchably couples one or more Direct Current (DC) PV panels in the PV panel string, then the PV panel disconnect switch is controlled to connect the one or more DC PV panels in the PV panel string. Otherwise, the PV panel disconnect switch is controlled to disconnect the one or more DC PV panels from the PV panel string. The test signal could be, for example, an Alternating Current (AC) signal tuned to a PV installation that includes the PV panel string and the inverter.

Abstract: A test signal is applied from a continuity test source to a photovoltaic (PV) panel string, to test electrical continuity in the PV panel string and between the PV panel string and an inverter that is coupled to the PV panel string. If the test signal is detected at a PV panel disconnect switch that is separate from the continuity test source and switchably couples one or more Direct Current (DC) PV panels in the PV panel string, then the PV panel disconnect switch is controlled to connect the one or more DC PV panels in the PV panel string. Otherwise, the PV panel disconnect switch is controlled to disconnect the one or more DC PV panels from the PV panel string. The test signal could be, for example, an Alternating Current (AC) signal tuned to a PV installation that includes the PV panel string and the inverter.

Abstract: A power supply arrangement includes a PFC converter, an LLC converter, a control unit and an offset unit. The control unit generates a control signal to control a duty cycle of a PWM (Pulse Width Modulation) signal to control the PFC converter. The control unit includes a PWM converter that generates the PWM signal to which a switching circuit is responsive to switch a current representing an input current of the PFC converter. An amplifier receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal. The variable offset signal is an offset current coupled to offset the current sense signal received at the input of the amplifier.

Abstract: A power supply arrangement includes a PFC converter, an LLC converter, a control unit and an offset unit. The control unit generates a control signal to control a duty cycle of a PWM (Pulse Width Modulation) signal to control the PFC converter. The control unit includes a PWM converter that generates the PWM signal to which a switching circuit is responsive to switch a current representing an input current of the PFC converter. An amplifier receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal. The variable offset signal is an offset current coupled to offset the current sense signal received at the input of the amplifier.

Abstract: An apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM switching signal that controls a switch in a PFC converter. The control unit includes a PWM converter to produce a PWM signal responsive to an output voltage of the PFC converter. A switching circuit switches a current representing an input current of the PFC converter in response to the PWM signal. A circuit generates the control signal in response to the switched current. The control unit includes an amplifier that receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to generate the control signal. The offset unit provides the offset signal as an offset current for offsetting a current at an input of the amplifier.

Abstract: An apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM switching signal that controls a switch in a PFC converter. The control unit includes a PWM converter to produce a PWM signal responsive to an output voltage of the PFC converter. A switching circuit switches a current representing an input current of the PFC converter in response to the PWM signal. A circuit generates the control signal in response to the switched current. The control unit includes an amplifier that receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to generate the control signal. The offset unit provides the offset signal as an offset current for offsetting a current at an input of the amplifier.

Abstract: Power factor correction converter control offset apparatus and methods are disclosed. In one aspect, an apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM (Pulse Width Modulation) switching signal that controls a switch in a PFC (Power Factor Correction) converter. An offset unit is also included and is coupled to the control unit, to generate a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal.

Abstract: Power factor correction converter control offset apparatus and methods are disclosed. In one aspect, an apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM (Pulse Width Modulation) switching signal that controls a switch in a PFC (Power Factor Correction) converter. An offset unit is also included and is coupled to the control unit, to generate a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal.