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Patent Searching and Data


Title:
POWER SUPPLY SWITCH WITH PROGRAMMABLE SWITCHING DECISION
Document Type and Number:
WIPO Patent Application WO/2019/095412
Kind Code:
A1
Abstract:
A programmable-threshold power supply selector has two power-supply inputs VDD1 and VDD2. The higher of these two voltages is pre-selected as a common supply that powers all transistors and circuitry in the programmable-threshold power supply selector, including substrates under transistors. An open-loop decision circuit is very stable since it uses no feedback. A tunable voltage divider divides VDD1 by a programmable divisor. The divided VDD is compared to a reference voltage to generate switch-control signals. The switch-control signals drive the gates of p-channel switch transistors that connect either VDD1 or VDD2 to an output supply voltage. The different programmable divisor values effectively cause VDD1 to be compared to a programmable threshold voltage VTH. The switch transistors switch the output supply voltage to VDD2 only when VDD1 falls below VTH. The output supply voltage remains at VDD1 even when VDD1 falls below VDD2, eliminating unnecessary power switching.

Inventors:
AU YEUNG CHUNG FAI (CN)
CHAN CHI HONG (CN)
YU HOK SAN (CN)
Application Number:
PCT/CN2017/112375
Publication Date:
May 23, 2019
Filing Date:
November 22, 2017
Export Citation:
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Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
H02J9/06
Foreign References:
CN106026358A2016-10-12
CN101841184A2010-09-22
CN106921211A2017-07-04
CN1423424A2003-06-11
CN201830014U2011-05-11
Attorney, Agent or Firm:
CHINA TRUER IP (CN)
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