Power supply circuit for providing semiconductor integrated circuit device with a plurality of power supply voltages
AssigneeFujitsu Limited
InventorsHidekiyo Ozawa, Hidenobu Ito, Chikara Tsuchiya
Life of this patent
Estimating the term…
Abstract
A DC-DC converter for controlling the order for providing a semiconductor integrated circuit device with a plurality of power supply voltages. A switch control circuit controls activation and inactivation of a transistor of the switch circuit based on the comparison result of a first voltage and a reference voltage and a notification signal provided to the switch control circuit. The switch control circuit generates a second voltage that is higher than the first voltage when the first voltage is higher than the reference voltage and the notification signal indicates that other semiconductor integrated circuit devices are ready to operate.
Claims30
A power supply circuit for generating a plurality of voltages, including first and second voltages, with an input voltage, the power supply circuit comprising:
- a converter circuit for converting the input voltage into the first voltage;
- a switch circuit for outputting the input voltage as the second voltage;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for comparing the first voltage with a reference voltage and controlling the switch circuit based on the comparison result and a notification signal indicating the condition of the first voltage.
A power supply circuit for generating a plurality of voltages, including first and second voltages, with an input voltage, the power supply circuit comprising:
- a converter circuit for converting the input voltage into the first voltage;
- a switch circuit for outputting the input voltage as the second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to the first voltage.
A power supply circuit for generating a plurality of voltages, including first and second voltages, with an input voltage, the power supply circuit comprising:
- a converter circuit for converting the input voltage into the first voltage by performing pulse width modulation based on the voltage difference between the first voltage and a lower one of a reference voltage and voltage of a soft-start signal;
- a switch circuit for outputting the input voltage as a second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to either one of the first voltage and the voltage of the soft-start signal voltage.
A semiconductor integrated circuit device comprising:
- a power supply circuit for generating first and second voltages with an input voltage, wherein the power supply circuit includes;
- a converter circuit for converting the input voltage into the first voltage;
- a switch circuit for outputting the input voltage as the second voltage;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for comparing the first voltage with a reference voltage to control the switch circuit based on the comparison result and a notification signal indicating the condition of the first voltage;
- and
- a semiconductor circuit, connected to the power supply circuit, for receiving the first and second voltages.
A semiconductor integrated circuit device comprising:
- a power supply circuit for generating first and second voltages with an input voltage, wherein the power supply circuit includes;
- a converter circuit for converting the input voltage to the first voltage;
- a switch circuit for outputting the input voltage as the second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to the first voltage;
- and
- a semiconductor circuit, connected to the power supply circuit, for receiving the first and second voltages.
A semiconductor integrated circuit device comprising:
- a power supply circuit for generating first and second voltages with an input voltage, wherein the power supply circuit includes;
- a converter circuit for converting the input voltage to the first voltage by performing pulse width modulation based on the voltage difference between the first voltage and a lower one of a reference voltage and voltage of a soft-start;
- a switch circuit for outputting the input voltage as the second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to either one of the first voltage and the voltage of the soft-start signal voltage;
- and
- a semiconductor circuit, connected to the power supply circuit, for receiving the first and second voltages.
An electronic device comprising:
- a plurality of power supply circuits, each generating first and second voltages with an input voltage, wherein each of the power supply circuits includes:
- a converter circuit for converting the input voltage to the first voltage;
- a switch circuit for outputting the input voltage as the second voltage;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for comparing the first voltage with a reference voltage to control the switch circuit based on the comparison result and a notification signal indicating the condition of the first voltage, the notification signal being provided to each of the power supply circuits.
An electronic device comprising:
- a plurality of power supply circuits, each generating first and second voltages with an input voltage, wherein each of the power supply circuits includes:
- a converter circuit for converting the input voltage to the first voltage by performing pulse width modulation based on the difference between the first voltage and a lower one of a reference voltage and voltage of a soft-start signal;
- a switch circuit for outputting the input voltage as the second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to either one of the first voltage and the voltage of the soft-start signal, the soft-start signal being provided to each of the power supply circuits.
An electronic device comprising:
- a plurality of semiconductor integrated circuit devices, wherein each of the semiconductor integrated circuit device includes:
- a power supply circuit for generating a plurality of voltages including first and second voltages with an input voltage, the power supply circuit including:
- a converter circuit for converting the input voltage into the first voltage;
- a switch circuit for outputting the input voltage as the second voltage;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for comparing the first voltage with a reference voltage and controlling the switch circuit based of the comparison result and a notification signal indicating the condition of the first voltage;
- and
- a semiconductor circuit, connected to the power supply circuit, for receiving the first and second voltages, the notification signal being provided to the power supply circuit of each of the semiconductor integrated circuit devices.
An electronic device comprising:
- a plurality of semiconductor integrated circuit devices, wherein each of the semiconductor integrated circuit device includes:
- a power supply circuit for generating a plurality of voltages, including first and second voltages, with an input voltage, the power supply circuit including:
- a converter circuit for converting the input voltage to the first voltage by performing pulse width modulation based on the voltage difference between the first voltage and a lower one of a reference voltage and voltage of a soft-start signal;
- a switch circuit for outputting the input voltage as the second voltage, the switch circuit having a resistance value;
- and
- a switch control circuit, connected to the converter circuit and the switch circuit, for controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to either one of the first voltage and the voltage of the soft-start signal voltage;
- and
- a semiconductor circuit connected to the power supply circuit for receiving the first and second voltages, the soft-start signal being provided to the power supply circuit of each of the semiconductor integrated circuit devices.
A method for controlling a power supply circuit including a converter circuit, for converting an input voltage into a first voltage, and a switch circuit, for outputting the input voltage as a second voltage, the method comprising:
- comparing the first voltage with a reference voltage;
- providing a notification signal indicating the condition of the first voltage;
- and
- controlling the switch circuit based on the comparison result and the notification signal indicating the condition of the first voltage.
A method for controlling a power supply circuit including a converter circuit, for converting an input voltage into a first voltage, and a switch circuit, for outputting the input voltage as a second voltage, the switch circuit having a resistance value, the method comprising:
- detecting the first voltage;
- and
- controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to the first voltage.
A method for controlling a power supply circuit including a converter circuit, for converting an input voltage to a first voltage by performing pulse width modulation based on the voltage difference between the first voltage and the lower one of a reference voltage and voltage of a soft-start signal voltage, and a switch circuit, for outputting the input voltage as a second voltage, the switch circuit having a resistance value, the method comprising:
- detecting either one of the first voltage and the soft-start signal voltage;
- and
- controlling the resistance value of the switch circuit so that the second voltage is generated in proportion to either one of the first voltage and the soft-start signal voltage.
Dependencies are inferred from the claim text.