Semiconductor device and overcurrent protection device
AssigneeFuji Electric Co., Ltd.
InventorShigeki Sato
Life of this patent
Estimating the term…
Abstract
A semiconductor device includes an output element configured to switch on and off based on a drive signal, so as to drive a load, a current monitoring element configured to monitor a current that flows through the output element, and a voltage control circuit that includes a first diode configured to charge a gate voltage applied to a gate of the current monitoring element and a second diode configured to discharge the gate voltage, so that the voltage control circuit controls the gate voltage. An anode of the first diode is connected to a gate of the output element and a cathode of the second diode, and a cathode of the first diode is connected to an anode of the second diode and the gate of the current monitoring element.
Claims9
A semiconductor device, comprising:
- an output element configured to switch on and off based on a drive signal, so as to drive a load;
- a current monitoring element configured to monitor a current that flows through the output element;
- and
- a voltage control circuit that includes:
- a first diode configured to charge a gate voltage applied to a gate of the current monitoring element,
- a second diode configured to discharge the gate voltage, so that the voltage control circuit controls the gate voltage, and
- a capacitor including:
- a first end connected to a cathode of the first diode, an anode of the second diode, and the gate of the current monitoring element, and
- a second end connected to an emitter of the output element.
An overcurrent protection device, comprising:
- a power supply terminal connected to a power supply, and an output terminal connected to a load;
- an output element connected to the power supply terminal and being configured to receive a power supply voltage through the power supply terminal, the output element being connected to the output terminal and being configured to switch on and off based on a drive signal, so as to drive the load through the output terminal;
- a current monitoring element configured to monitor a current that flows through the output element;
- a voltage control circuit that includes:
- a first diode configured to charge a gate voltage applied to a gate of the current monitoring element,
- a second diode configured to discharge the gate voltage, so that the voltage control circuit controls the gate voltage, and
- a capacitor including:
- a first end connected to a cathode of the first diode, an anode of the second diode, and the gate of the current monitoring element, and
- a second end connected to an emitter of the output element;
- a control circuit configured to output the drive signal to the output element to control the switching of the output element;
- a current sensing resistor configured to convert a sense current output from the current monitoring element into a voltage and output a converted voltage as a sense current detection signal;
- and
- an overcurrent detection circuit configured to detect 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.