| Original document(15 pages) 中文版 |
The present invention provides a power supply unit (regulator circuit) capable of preventing thermal breakdown of a driven transistor that may be caused accidentally in case the collector output of the transistor is grounded. A power supply unit (10) for supplying a driving current to a base of a transistor (20) to thereby drive the same has a lower threshold comparator (14) which compares an actual collector output Vin of the transistor (20) with a lower threshold of 0.5 Vref, and sends a stop signal to a current controller (18) if the collector output Vin is less than the lower threshold of 0.5 Vref. Thus, when the collector output of the transistor (20) is grounded directly without via a load circuit (40), the collector output Vin is rendered under the lower threshold of 0.5 Vref, so that the current controller (18) receives the stop signal from the lower threshold comparator (14) and then stops the supply of the driving current to the transistor (20). Consequently, it becomes possible to prevent thermal breakdown of the transistor (20) that may otherwise be caused by any excessive supply of the driving current. |
Application Number
申请号 |
01804556 |
Application Date
申请日 |
2001.11.29 |
| Title 名称 |
Power supply device, transistor driving method, recording medium |
Publication Number
公开号 |
1398365 |
Publication Date
公开日 |
2003.02.19 |
| Approval Pub. Date |
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Granted Pub. Date |
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| International Classification 分类号 |
G05F1/56 |
Applicant(s) Name
申请人 |
Sony Corp |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Sudo Kazuo |
| Attorney & Agent 代理人 |
li qiang |
| More information 更 多 信 息 |
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