Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit
AssigneeHitachi, Ltd.
InventorsNaoki Maru, Hideho Yamamura, Koji Nisisu, Shigeo Oomae
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Abstract
In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current directions of power supplies solves the malfunction of the power supplies vibrating or diverging during changes in load state and during parallel operation, and thus implements stable operation. The direction of an output current I2 can be detected by using the current detection circuit 8 that has multiple switching elements S1 to S4 each operating synchronously with an inverter circuit.
Claims12
A current detection circuit for detecting an electric current of a switching power supply circuit in which an output of an inverter circuit is connected to a rectifier circuit via a transformer and an output of the rectifier circuit is connected to a smoothing circuit, the current detection circuit comprising:
- a switching circuit including a plurality of switching elements, wherein the switching circuit receives a current waveform or voltage waveform analogous to a waveform of a primary-side current of the transformer, and operates synchronously with the inverter circuit.
A parallel power supply system comprising at least two switching power supply units, wherein each of the switching power supply units includes:
- a switching power supply circuit in which an output of an inverter circuit is connected to a rectifier circuit via a transformer, the rectifier circuit having an output connected to a smoothing circuit;
- and
- a current detection circuit including plural switching elements each operating synchronously with the inverter circuit, the current detection circuit generating a current detection voltage by receiving an input signal having a current waveform or voltage waveform analogous to a waveform of a primary-side current of the transformer.
Dependencies are inferred from the claim text.