IES950410A2 - Power supply control circuit - Google Patents

Power supply control circuit

Info

Publication number
IES950410A2
IES950410A2 IES950410A IES950410A2 IE S950410 A2 IES950410 A2 IE S950410A2 IE S950410 A IES950410 A IE S950410A IE S950410 A2 IES950410 A2 IE S950410A2
Authority
IE
Ireland
Prior art keywords
transistor
microprocessor
power supply
power
fet
Prior art date
Application number
Inventor
Mark Leyden
Original Assignee
Bmr Res & Dev Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bmr Res & Dev Ltd filed Critical Bmr Res & Dev Ltd
Priority to IES950410 priority Critical patent/IES950410A2/en
Priority to IE950561A priority patent/IE78005B1/en
Publication of IES65854B2 publication Critical patent/IES65854B2/en
Publication of IES950410A2 publication Critical patent/IES950410A2/en

Links

Landscapes

  • Direct Current Feeding And Distribution (AREA)
  • Power Sources (AREA)

Abstract

A power supply control circuit comprises a field effect transistor FET connected between a battery BAT and a microprocessor uP to be powered, and a bistable circuit 11 comprising cross-coupled transistors Q1 and Q2 connected to the power supply and to the switching device. When power is turned on by closing switch SW the circuit 11 assumes a state wherein transistor Q2 is on and transistor Q1 is off so that the current drawn by the transistor Q2 through a resistor R4 provides a voltage drop across the source-drain of the FET sufficient to turn the latter on to allow power to be supplied to the microprocessor. However, upon certain predetermined condition(s) being met the microprocessor turns transistor Q1 on by a signal at its base thereby turning transistor Q2 off so that the FET turns off to remove power from the microprocessor.
IES950410 1995-06-06 1995-06-06 Power supply control circuit IES950410A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IES950410 IES950410A2 (en) 1995-06-06 1995-06-06 Power supply control circuit
IE950561A IE78005B1 (en) 1995-06-06 1995-07-21 Power supply control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES950410 IES950410A2 (en) 1995-06-06 1995-06-06 Power supply control circuit

Publications (2)

Publication Number Publication Date
IES65854B2 IES65854B2 (en) 1995-11-29
IES950410A2 true IES950410A2 (en) 1995-11-29

Family

ID=11040779

Family Applications (1)

Application Number Title Priority Date Filing Date
IES950410 IES950410A2 (en) 1995-06-06 1995-06-06 Power supply control circuit

Country Status (1)

Country Link
IE (1) IES950410A2 (en)

Also Published As

Publication number Publication date
IES65854B2 (en) 1995-11-29

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Legal Events

Date Code Title Description
FD4E Short term patents deemed void under section 64