Motor driving device

A motor driving device comprising:

• a bridge circuit that includes a plurality of series circuits connected between a power supply line and a ground, and is connected to a motor at a middle connecting point of each of the plurality of series circuits, the plurality of series circuits each being a series circuit of a high-side switching element and a low-side switching element, wherein
• the low-side switching element includes a first terminal, a second terminal, and a control terminal, and has a function of making an electrical connection between the first terminal and the second terminal when a voltage greater than or equal to a predetermined threshold is applied between the control terminal and the second terminal, the first terminal being connected to the high-side switching element, the second terminal being connected to the ground, and
• the motor driving device further comprises:
• a control circuit that outputs a drive signal for driving at least the low-side switching element;
• a voltage detection circuit that is connected between the power supply line and the control terminal of the low-side switching element, is put into a conducting state when a voltage between the power supply line and the control terminal of the low-side switching element reaches or exceeds a first predetermined value, and outputs a detection signal that is put into a first state when the voltage between the power supply line and the control terminal of the low-side switching element reaches or exceeds a second predetermined value;
• a driving switch that is connected between the control terminal and the second terminal of the low-side switching element, and opens or closes according to the drive signal;
• and
• a logic circuit that puts the driving switch into an open state regardless of the drive signal when the detection signal from the voltage detection circuit is put into the first state.

A motor driving device comprising:

• a bridge circuit that includes a plurality of series circuits connected between a power supply line and a ground, and is connected to a motor at a middle connecting point of each of the plurality of series circuits, the plurality of series circuits each being a series circuit of a high-side switching element and a low-side switching element, wherein
• the high-side switching element includes a first terminal, a second terminal, and a control terminal, and has a function of making an electrical connection between the first terminal and the second terminal when a voltage equal to or greater than a predetermined threshold is applied between the control terminal and the second terminal, the first terminal being connected to the power supply line, the second terminal being connected to the low-side switching element, and
• the motor driving device further comprises:
• a control circuit that outputs a drive signal for driving at least the high-side switching element;
• a voltage detection circuit that is connected between the power supply line and the control terminal of the high-side switching element, is put into a conducting state when a voltage between the power supply line and the control terminal of the high-side switching element reaches or exceeds a first predetermined value, and outputs a detection signal that is put into a first state when the voltage between the power supply line and the control terminal of the high-side switching element reaches or exceeds a second predetermined value;
• a driving switch that is connected between the control terminal and the second terminal of the high-side switching element, and opens or closes according to the drive signal;
• and
• a logic circuit that puts the driving switch into an open state regardless of the drive signal when the detection signal from the voltage detection circuit is put into the first state.