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Patent Searching and Data


Title:
POWER SUPPLY CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2018/147172
Kind Code:
A1
Abstract:
This power supply circuit 20 is provided with: a voltage boosting circuit 21 which boosts an input voltage Vin; a discharge circuit 22 which is connected to an output terminal of the voltage boosting circuit 21 and decreases the output voltage of the voltage boosting circuit 21 when power is turned off; and a detecting circuit 23 which is connected to the output terminal of the voltage boosting circuit 21 and detects, on the basis of the output voltage of the voltage boosting circuit 21, a discharge period that occurs while power is turned off. The voltage boosting circuit 21 stops an operation during the discharge period, which occurs while power is turned off, detected by the detecting circuit 23. The power supply circuit may be provided with a voltage lowering circuit instead of the voltage boosting circuit. Thus, a power supply circuit is provided which correctly operates even when power is turned on immediately after being turned off.

Inventors:
TSUNEKAWA TAKUYA
Application Number:
PCT/JP2018/003510
Publication Date:
August 16, 2018
Filing Date:
February 02, 2018
Export Citation:
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Assignee:
SHARP KK (JP)
International Classes:
H02M3/155; G09G3/20
Foreign References:
JP2010148234A2010-07-01
Attorney, Agent or Firm:
SHIMADA, Akihiro et al. (JP)
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