Switching power source circuit for independent per cycle control of ON/OFF time ratio
AssigneeFdk Corporation
InventorsFumiaki Nakao, Tetsuya Suzuki, Yasuo Yamashita, Kazuo Takehara
Life of this patent
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Abstract
A switching power supply circuit, which can respond to a rapid and large change in a load quickly and stably and ensure a power supply output having a predetermined voltage, is provided. In the power supply circuit which supplies an input current to a load while switching the input current periodically and controls an output voltage Vo supplied to the load to a predetermined target value by controlling an ON/OFF time ratio (t1/t2) of the switching variably, a control of the ON/OFF time ratio is performed for every one current supply cycle T independently.
Claims16
A switching power supply circuit which supplies an input current to a load while switching the input current periodically and controls an output voltage supplied to the load to a predetermined target value by controlling an ON/OFF time ratio of the switching,
- the switching power supply circuit comprising:
- a circuit performing a control of the ON/OFF time ratio for every one current supply cycle independently, wherein the control of the ON/OFF time ratio is performed based on a difference between the output voltage and a reference voltage immediately before each ON period starts.
A semiconductor circuit device constituting a principal part of a switching power supply circuit comprising a circuit which supplies an input current to a load while switching the input current periodically, and controls an output voltage supplied to the load to a predetermined target value by variably controlling an ON/OFF time ratio of switching, thus performing a control of the ON/OFF time ratio for every one current supply cycle independently, wherein a switching element for switching the input current periodically and at least a part of a control circuit for controlling the ON/OFF time ratio of the switching element for every current supply cycle independently are integrally formed on a single semiconductor substrate.
A switching power supply circuit, comprising:
- a switching element for switching an input current periodically;
- a driving circuit for ON/OFF driving the switching element;
- and
- a circuit for comparing an output voltage supplied to a load with a predetermined target value, and for independently controlling an ON/OFF time ratio of the driving circuit for every one current supply cycle based on a comparison result, wherein the control of the ON/OFF time ratio is performed based on a difference between the output voltaae and a reference voltage immediately before each ON period starts.
Dependencies are inferred from the claim text.