Semiconductor device and overcurrent protection device
AssigneeFuji Electric Co., Ltd.
InventorShigeki Sato
Life of this patent
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Abstract
A semiconductor device, including: an output element having a gate, the output element being configured to perform switching to thereby operate a load of the semiconductor device in accordance with a drive signal applied to the gate thereof; a current monitoring element having a gate and a sense emitter, the current monitoring element being configured to monitor a current flowing through the output element; and a voltage division circuit, which is connected between the gate of the output element and the sense emitter of the current monitoring element, which divides a voltage of the drive signal applied to the gate of the output element, and which applies an obtained voltage to the gate of the current monitoring element.
Claims8
A semiconductor device, comprising:
- an output element having a gate, the output element being configured to perform switching to thereby operate a load of the semiconductor device in accordance with a drive signal applied to the gate thereof;
- a current monitoring element having a gate and a sense emitter, the current monitoring element being configured to monitor a current flowing through the output element;
- and
- a voltage division circuit, which is connected between the gate of the output element and the sense emitter of the current monitoring element, which divides a voltage of the drive signal applied to the gate of the output element, and which applies an obtained voltage to the gate of the current monitoring element.
An overcurrent protection device having a power supply terminal and an output terminal, the overcurrent protection device comprising:
- an output element having a gate, the output element
- being connected via the power supply terminal to a power supply voltage,
- being connected via the output terminal to a load of the overcurrent protection device, and
- being configured to perform switching to thereby operate the load in accordance with a drive signal applied to the gate thereof;
- a current monitoring element having a gate and a sense emitter, the current monitoring element being configured to monitor a current flowing through the output element;
- a voltage division circuit, which is connected between the gate of the output element and the sense emitter of the current monitoring element, which divides a voltage of the drive signal applied to the gate of the output element, and which applies an obtained voltage to the gate of the current monitoring element;
- a control circuit which outputs the drive signal and which controls the switching of the output element;
- a current detection resistor configured to output a sense current detection signal, which is a voltage generated at the current detection resistor by a sense current output from the current monitoring element;
- and
- an overcurrent detection circuit which detects an overcurrent state of the output element by comparing the sense current detection signal with a reference voltage.
Dependencies are inferred from the claim text.