Load driver

A load driver comprising:

• a power converter connected between a power supply line and a ground line, the power supply line connected to a battery, the power converter configured to supply converted power to a load by converting direct current power of the battery;
• a control circuit configured to control the power converter by a voltage applied from the battery;
• a reverse-connection protective relay being a semiconductor switching element and connected to the ground line, the reverse-connection protective relay configured to be turned off to interrupt a current flowing from the ground line to the power supply line via the power converter in a case where the battery is connected in a reverse direction;
• and
• an internal power supply generation circuit configured to apply a generated voltage to a gate of the reverse-connection protective relay based on a voltage applied from the battery to the power supply line,
• wherein a voltage required for turning on the reverse-connection protective relay is applied to the gate of the reverse-connection protective relay in a case where the battery is connected in a forward direction, and is not applied to the gate of the reverse-connection protective relay in a case where the battery is connected in the reverse direction.

A load driver comprising:

• a power converter connected between a power supply line and a ground line, the power supply line connected to a battery, the power converter configured to supply converted power to a load by converting direct current power of the battery;
• a control circuit configured to control the power converter by a voltage applied from the battery;
• a reverse-connection protective relay being a semiconductor switching element and connected to the ground line, the reverse-connection protective relay configured to be turned off to interrupt a current flowing from the ground line to the power supply line via the power converter in a case where the battery is connected in a reverse direction;
• and
• a Zener diode connected to a gate voltage application path of the reverse-connection protective relay, the Zener diode configured to interrupt a dark current,
• wherein a voltage required for turning on the reverse-connection protective relay is applied to the gate of the reverse-connection protective relay in a case where the battery is connected in a forward direction, and is not applied to the gate of the reverse-connection protective relay in a case where the battery is connected in the reverse direction.

A load driver comprising:

• a power converter including pairs of an upper arm switching element and a lower arm switching element, the upper arm switching element and the lower arm switching element being connected in series between a power supply line and a ground line, the pairs of the upper arm switching element and the lower arm switching element corresponding to respective phases of a load, the power supply line connected to a battery, the power converter configured to supply converted power to the load by converting direct current power of the battery;
• a control circuit configured to control the power converter by a voltage applied from the battery;
• a reverse-connection protective relay being a semiconductor switching element, the reverse-connection protective relay configured to be turned off to interrupt a current flowing from the ground line to the power supply line via the power converter in a case where the battery is connected in a reverse direction;
• and
• a multiphase pre-driver configured to control the pairs of the upper arm switching element and the lower arm switching element in the power converter by a voltage applied from the battery, the multiphase pre-driver having a charge pump configured to boost the voltage applied from the battery, the charge pump having an output end connected to a gate of the reverse-connection protective relay,
• wherein the reverse connection protective relay is further configured to be turned on by an output voltage of the charge pump during an operation of the charge pump.