Protection device, complementary protection device, signal output device, latch-up preventing method, and computer-readable medium

A protection device comprising:

• a serial element unit that includes a first switching element in a non-conduction state at a normal time and a resistive element series-connected to the first switching element, one end of the first switching element side of the serial element unit being connected to a control terminal of a protection-target switching element, the other end of the resistive element side of the serial element unit being connected to a first voltage line, the protection-target switching element including a first terminal connected to the first voltage line to which a first voltage is applied, a second terminal connected to a second voltage line to which a second voltage different from the first voltage is applied and an inductor unit having an inductor component, and the control terminal, the protection-target switching element switching a conduction state at the normal time to a non-conduction state between the first terminal and the second terminal that are in a non-conduction state at the normal time when an off-voltage is applied to the control terminal;
• a second switching element that is in a non-conduction state at the normal time, one end of the second switching element being connected to a connection portion of the first switching element and the resistive element, the other end of the second switching element being connected to the first voltage line;
• and
• a controller that performs control such that the first switching element is in a conduction state and the second switching element is in a conduction state if the protection-target switching element is put into a non-conduction state in a state in which an overcurrent is not passed through the protection-target switching element, and the controller performs control such that the first switching element is in the conduction state and the second switching element is in the non-conduction state if the protection-target switching element is put into the non-conduction state in a state in which the overcurrent is passed through the protection-target switching element.

A computer-readable medium in which a program causing a computer to execute processing is stored, the processing comprising:

• performing control such that a first switching element is in a conduction state and a second switching element is in a conduction state, if a protection-target switching element is put into a non-conduction state in a state in which an overcurrent is not passed through the protection-target switching element, the protection-target switching element including a first terminal connected to a first voltage line to which a first voltage is applied, a second terminal connected to a second voltage line to which a second voltage different from the first voltage is applied and an inductor unit having an inductor component, and a control terminal, the protection-target switching element switching a conduction state at a normal time to a non-conduction state between the first terminal and the second terminal when an off-voltage is applied to the control terminal, the first switching element which is in a non-conduction state at the normal time and a resistive element series-connected to the first switching element being included in a serial element unit, one end of the first switching element side of the serial element unit being connected to the control terminal of the protection-target switching element, the other end of the resistive element side of the serial element unit being connected to the first voltage line, the second switching element being in a non-conduction state at the normal time, one end of the second switching element being connected to a connection portion of the first switching element and the resistive element, and the other end of the second switching element being connected to the first voltage line;
• and
• performing control such that the first switching element is in a conduction state and the second switching element is in the non-conduction state if the protection-target switching element is put into the non-conduction state in a state in which the overcurrent is passed through the protection-target switching element.

A computer-readable medium in which a program causing a computer to execute processing is stored, the processing comprising:

• performing control such that a first switching element is in a conduction state and a second switching element is in a conduction state if a protection-target switching element is put into a non-conduction state in a state in which an overcurrent is not passed through the protection-target switching element, the protection-target switching element including a first terminal connected to a first voltage line to which a first voltage is applied, a second terminal connected to a second voltage line to which a second voltage different from the first voltage is applied and an inductor unit having an inductor component, and a control terminal, the protection-target switching element switching a conduction state at a normal time to the non-conduction state between the first terminal and the second terminal when an off-voltage is applied to the control terminal, the first switching element which is in a non-conduction state at the normal time and a resistive element series-connected to the first switching element being included in a serial element unit, one end of the first switching element side of the serial element unit being connected to the control terminal of the protection-target switching element, the other end of the resistive element side of the serial element unit being connected to the first voltage line, the second switching element being in a non-conduction state at the normal time, one end of the second switching element being connected to a connection portion of the first switching element and the resistive element, and the other end of the second switching element being connected to the first voltage line;
• performing control such that the first switching element is in a conduction state and the second switching element is in the non-conduction state if the protection-target switching element is put into the non-conduction state in a state in which the overcurrent is passed through the protection-target switching element;
• and
• performing control such that a third switching element is in a conduction state and a fourth switching element in a conduction state if a second protection-target switching element is put into the non-conduction state in a state in which the overcurrent is not passed through the second protection-target switching element, the second protection-target switching element including a corresponding first terminal that corresponds to the first terminal and that is connected to the second voltage line, a corresponding second terminal that corresponds to the second terminal and that is connected to the second terminal, and a corresponding control terminal corresponding to the control terminal, the second protection-target switching element switching a conduction state at the normal time to a non-conduction state between the corresponding first terminal and the corresponding second terminal when the off-voltage is applied to the corresponding control terminal, the third switching element which is in a non-conduction state at the normal time and a third resistive element series-connected to the third switching element being included in a second serial element unit, one end of the third switching element side of the second serial element unit being connected to the corresponding control terminal of the second protection-target switching element, the other end of the third resistive element side of the second serial element unit being connected to the second voltage line, the fourth switching element being in a non-conduction state at the normal time, one end of the fourth switching element being connected to a connection portion of the third switching element and the third resistive element, and the other end of the fourth switching element being connected to the second voltage line;
• and
• performing control such that the third switching element is in a conduction state and the fourth switching element in the non-conduction state if the second protection-target switching element is put into the non-conduction state in a state in which the overcurrent is passed through the second protection-target switching element.