Abstract: An isolated DC-DC converter includes a transformer, a full-bridge switching circuit, a protective circuit, a control unit, an inductor, and an output circuit. The isolated DC-DC converter includes a first voltage detection unit that detects a voltage value between a first conductive path and a second conductive path, and a first current detection unit that detects a current value of the inductor. The control unit determines at least one of a first dead time and a second dead time on the basis of the voltage value detected by the first voltage detection unit and the current value detected by the first current detection unit, using a method that increases the dead time as the voltage value increases and reduces the dead time as the current value increases.

Abstract: A circuit is protected from sudden potential fluctuations that occur in a power ground. An in-vehicle protection apparatus includes a first Zener diode portion, a second Zener diode portion, a diode portion, and an intermediate conductive path. A voltage based on a power source is applied to the anode side of the diode portion. The intermediate conductive path is provided with a branch portion at one end, and forms a path between the cathode of the diode portion and the branch portion. The cathode of the first Zener diode portion is electrically connected to the branch portion and the anode of the first Zener diode portion is electrically connected to a power ground line. The cathode of the second Zener diode portion is electrically connected to the branch portion and the anode of the second Zener diode portion is electrically connected to a signal ground line.

Abstract: An isolated DC-DC converter includes a transformer, a full-bridge switching circuit, a protective circuit, a control unit, an inductor, and an output circuit. The isolated DC-DC converter includes a first voltage detection unit that detects a voltage value between a first conductive path and a second conductive path, and a first current detection unit that detects a current value of the inductor. The control unit determines at least one of a first dead time and a second dead time on the basis of the voltage value detected by the first voltage detection unit and the current value detected by the first current detection unit, using a method that increases the dead time as the voltage value increases and reduces the dead time as the current value increases.

Abstract: A circuit is protected from sudden potential fluctuations that occur in a power ground. An in-vehicle protection apparatus includes a first Zener diode portion, a second Zener diode portion, a diode portion, and an intermediate conductive path. A voltage based on a power source is applied to the anode side of the diode portion. The intermediate conductive path is provided with a branch portion at one end, and forms a path between the cathode of the diode portion and the branch portion. The cathode of the first Zener diode portion is electrically connected to the branch portion and the anode of the first Zener diode portion is electrically connected to a power ground line. The cathode of the second Zener diode portion is electrically connected to the branch portion and the anode of the second Zener diode portion is electrically connected to a signal ground line.

Abstract: An on-vehicle power supply circuit includes a first inner power supply unit that supplies power to a control unit based on power supplied from a first power storage unit, a second inner power supply unit that supplies power to the control unit based on power supplied from a second power storage unit, and an operation voltage adjustment unit. The operation voltage adjustment unit outputs an operation voltage to the control unit based on power from the second inner power supply unit when power supply from the second inner power supply unit is in a normal state, and outputs an operation voltage to the control unit based on power from the first inner power supply unit when power supply from the second inner power supply unit is not in a normal state.