TW200634499A - Circuit for protecting electrical element - Google Patents
Circuit for protecting electrical elementInfo
- Publication number
- TW200634499A TW200634499A TW094108419A TW94108419A TW200634499A TW 200634499 A TW200634499 A TW 200634499A TW 094108419 A TW094108419 A TW 094108419A TW 94108419 A TW94108419 A TW 94108419A TW 200634499 A TW200634499 A TW 200634499A
- Authority
- TW
- Taiwan
- Prior art keywords
- transistor
- power
- electric potential
- power supply
- supply circuit
- Prior art date
Links
Landscapes
- Electronic Switches (AREA)
- Semiconductor Integrated Circuits (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A protecting circuit for protecting an electrical element is connected to an input terminal of a power supply circuit. The power supply circuit receives a first control signal for generating a working voltage to the electrical element. The protecting circuit comprises a first transistor and a second transistor. The first transistor comprises a first base for receiving a power detection signal, a first emitter connected to the ground, anda first collector for receiving a second control signal. The second transistor comprises a second base collected to the first collector, a second emitter connected to the ground, and a second collector for receiving the first control signal. Wherein the power detection signal has a high electric potential when a computer is power on. It makes the first transistor conducting and the second transistor blocking. The input terminal of the power supply circuit outputs ahigh electric potential signal. When the computer is power off, the power detection signal changes to a low electric potential immediately. It makes the first transistor blocking and the second transistor conducting. The input terminal of the power supply circuit outputs a low electric potential signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW94108419A TWI274989B (en) | 2005-03-18 | 2005-03-18 | Circuit for protecting electrical element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW94108419A TWI274989B (en) | 2005-03-18 | 2005-03-18 | Circuit for protecting electrical element |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200634499A true TW200634499A (en) | 2006-10-01 |
TWI274989B TWI274989B (en) | 2007-03-01 |
Family
ID=38624236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW94108419A TWI274989B (en) | 2005-03-18 | 2005-03-18 | Circuit for protecting electrical element |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI274989B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI460578B (en) * | 2007-11-02 | 2014-11-11 | Hon Hai Prec Ind Co Ltd | Adaptation circuit of power supply |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI416312B (en) * | 2009-09-22 | 2013-11-21 | Hon Hai Prec Ind Co Ltd | Electronic apparatus and power-off protecting method |
-
2005
- 2005-03-18 TW TW94108419A patent/TWI274989B/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI460578B (en) * | 2007-11-02 | 2014-11-11 | Hon Hai Prec Ind Co Ltd | Adaptation circuit of power supply |
Also Published As
Publication number | Publication date |
---|---|
TWI274989B (en) | 2007-03-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |