Power supply circuit and switching control circuit
AssigneeFuji Electric Co., Ltd.
InventorMasashi Akahane
Life of this patent
Estimating the term…
Abstract
A power supply circuit configured to generate an output voltage at a target level from an input voltage thereof. The power supply circuit includes a wiring configured to receive the input voltage, a variable resistor provided between the wiring and a predetermined node, a voltage generation circuit configured to apply a voltage at a predetermined level to the predetermined node based on a current from the variable resistor, an output circuit configured to output the output voltage at the target level, in response to the voltage at the predetermined level being applied to the predetermined node, and an adjustment circuit configured to increase a resistance value of the variable resistor in response to a predetermined time period having elapsed since starting of generation of the output voltage.
Claims12
A power supply circuit configured to generate an output voltage at a target level from an input voltage thereof, the power supply circuit having a predetermined node therein, and comprising:
- a wiring configured to receive the input voltage;
- a variable resistor provided between the wiring configured to receive the input voltage and the predetermined node, the variable resistor being configured to pass a current from the wiring to the predetermined node;
- a voltage generation circuit configured to apply a voltage at a predetermined level to the predetermined node based on a current from the variable resistor;
- an output circuit configured to output the output voltage at the target level, in response to the voltage at the predetermined level being applied to the predetermined node;
- and
- an adjustment circuit electrically connected to the predetermined node through the variable resistor, the adjustment circuit being configured to increase a resistance value of the variable resistor in response to a predetermined time period having elapsed since starting of generation of the output voltage.
A switching control circuit configured to control switching of a first switching device on a power supply side and a second switching device on a ground side, the first and second switching devices being configured to drive a load, the switching control circuit comprising:
- a signal output circuit configured to output, in response to an input signal thereof,
- a set signal to turn on the first switching device and
- a reset signal to turn off the first switching device;
- a level shifter circuit configured to shift a level of each of the set signal and the reset signal;
- a driver circuit configured to drive the first switching device in response to an output from the level shifter circuit;
- and
- a power supply circuit configured to generate an output voltage at a target level from an input voltage thereof, and to supply the output voltage as a power supply voltage of the signal output circuit, wherein the power supply circuit has a predetermined node therein, and includes
- a wiring configured to receive the input voltage;
- a variable resistor provided between the wiring configured to receive the input voltage and the predetermined node, the variable resistor being configured to pass a current from the wiring to the predetermined node,
- a voltage generation circuit configured to apply a voltage at a predetermined level to the predetermined node based on a current from the variable resistor,
- an output circuit configured to output the output voltage at the target level, in response to the voltage at the predetermined level being applied to the predetermined node, and
- an adjustment circuit electrically connected to the predetermined node through the variable resistor, the adjustment circuit being configured to increase a resistance value of the variable resistor in response to a predetermined time period having elapsed since starting of generation of the output voltage.
A power supply circuit configured to generate an output voltage at a target level from an input voltage thereof, the power supply circuit having a predetermined node therein, and comprising:
- a wiring configured to receive the input voltage;
- a variable resistor provided between the wiring configured to receive the input voltage and the predetermined node;
- a voltage generation circuit configured to apply a voltage at a predetermined level to the predetermined node based on a current from the variable resistor;
- an output circuit configured to output the output voltage at the target level, in response to the voltage at the predetermined level being applied to the predetermined node;
- and
- an adjustment circuit configured to increase a resistance value of the variable resistor such that the current flowing from the variable resistor to the predetermined node decreases, in response to a predetermined time period having elapsed since starting of generation of the output voltage.
Dependencies are inferred from the claim text.