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US 12,683,600 B2Granted
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 according to a drive signal to drive a load, a current monitoring element configured to monitor a current flowing through the output element, and a capacitor having one end connected to a gate of the output element and another end connected to a gate of the current monitoring element. The semiconductor device further includes a current detection resistor configured to output a sense current detection signal obtained by converting a sense current output from the current monitoring element into a voltage, 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.
Claims13
A semiconductor device, comprising:
- an output element configured to switch on and off according to a drive signal to drive a load;
- a current monitoring element configured to monitor a current flowing through the output element;
- a capacitor having one end connected to a gate of the output element and another end connected to a gate of the current monitoring element;
- and
- a voltage divider including a first resistor and a second resistor connected in series, the voltage divider having one end connected to the gate of the output element and being configured to divide a gate voltage of the output element and apply a divided voltage to the gate of the current monitoring element, wherein
- the capacitor and the first resistor are connected in parallel between the gates of the output element and the current monitoring element.
3 more elements
A semiconductor device, comprising:
- an output element configured to switch on and off according to a drive signal to drive a load;
- a current monitoring element configured to monitor a current flowing through the output element;
- a voltage divider configured to divide a gate voltage of the output element and apply the divided voltage to a gate of the current monitoring element;
- and
- a capacitor, which is different from a parasitic capacitance present between the gate and a sense emitter of the current monitoring element, having one end connected to the gate of the current monitoring element and another end connected to the sense emitter of the current monitoring element.
2 more elements
An overcurrent protection device, comprising:
- a power supply terminal connected to a power supply;
- 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 according to a drive signal to drive the load through the output terminal;
- a current monitoring element configured to monitor a current flowing through the output element;
- a capacitor having one end connected to a gate of the output element and another end connected to a gate of the current monitoring element;
- a control circuit configured to output the drive signal to control the switching of the output element;
- a voltage divider including a first resistor and a second resistor connected in series, the voltage divider having one end connected to the gate of the output element and being configured to divide a gate voltage of the output element and apply a divided voltage to the gate of the current monitoring element;
- a current detection resistor configured to convert a sense current output from the current monitoring element into a voltage and output the 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, wherein
- the capacitor and the first resistor are connected in parallel between the gates of the output element and the current monitoring element.
8 more elements
An overcurrent protection device, comprising:
- a power supply terminal connected to a power supply;
- 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 according to a drive signal to drive the load through the output terminal;
- a current monitoring element configured to monitor a current flowing through the output element;
- a capacitor, which is different from a parasitic capacitance present between a gate and a sense emitter of the current monitoring element, having one end connected to the gate of the current monitoring element and another end connected to the sense emitter of the current monitoring element;
- a voltage divider configured to divide a gate voltage of the output element and apply the divided voltage to the gate of the current monitoring element;
- a control circuit configured to output the drive signal to control the switching of the output element;
- a current detection resistor configured to convert a sense current output from the current monitoring element into a voltage and output the 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.
7 more elements
Dependencies are inferred from the claim text.