IES950410A2 - Power supply control circuit - Google Patents
Power supply control circuitInfo
- 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
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.
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) |
-
1995
- 1995-06-06 IE IES950410 patent/IES950410A2/en not_active IP Right Cessation
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 |