发明名称 |
POLARITY REVERSAL PROTECTION CIRCUIT FOR A FINAL ELECTRONIC POWER STAGE |
摘要 |
<p>A polarity reversal protective circuit for an electronic power output stage that can be driven via a drive circuit is described. In the case of an incorrect polarization of a supply voltage, power FETs are used in at least one supply terminal to interrupt a connection of the wrongly applied supply voltage to the drive circuit and the power output stage. A definite polarity reversal protection is obtained using a circuit that is improved with respect to cost and space requirement. A single N-channel power FET is looped, with its source-drain path, into the positive supply terminal of the supply voltage. The source terminal of the N-channel power FET is connected with the positive supply terminal. The gate terminal of the N-channel power FET is connected to a collector of a PNP transistor, which is additionally connected to an output of the drive circuit via a current-limiting resistor. An emitter of the PNP transistor is connected-via a diode that is conductive when the supply voltage is wrongly applied-to the positive supply terminal. The base of the PNP transistor is connected-via a base resistor-to a negative (ground) supply terminal of the supply voltage.</p> |
申请公布号 |
EP1046207(A1) |
申请公布日期 |
2000.10.25 |
申请号 |
EP19990968742 |
申请日期 |
1999.09.03 |
申请人 |
ROBERT BOSCH GMBH |
发明人 |
BRAUN, PETER;KERN, ROBERT |
分类号 |
H02H11/00;(IPC1-7):H02H11/00;H02H3/18 |
主分类号 |
H02H11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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