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Kline-RS232 circuit with function of preventing reverse connection

An anti-reverse connection and circuit technology, which is applied in the direction of logic circuit connection/interface layout, etc., can solve the problems that the circuit system is easy to burn, cannot fully apply the mainstream on-board diagnostic system, and increases the cost of developers.

Active Publication Date: 2010-01-13
SHANGHAI HIGH ENERGY AUTO ELECTRONIC CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many kinds of conversion circuits with the same function on the market, but none of them can be fully applied to mainstream vehicle diagnostic systems, because mainstream vehicle power supplies include 12V and 24V systems, and these conversions are either suitable for 12V systems or 24V systems. Difficult to apply to both power systems at the same time
At the same time, due to the complexity of the vehicle circuit, when the circuit is connected to the ECU terminal, the entire circuit system is easily burned, resulting in a waste of user time and an increase in developer costs.

Method used

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  • Kline-RS232 circuit with function of preventing reverse connection

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Embodiment 1

[0018] Such as figure 1 As shown, a new Kline to RS232 conversion is characterized in that the circuit is mainly composed of three parts: a mutual conversion circuit between KlineTTL level and RS232 negative logic level, a 12V and 24V adaptive circuit, and an anti-reverse connection protection circuit; The mutual conversion circuit between the Kline TTL level and the RS232 negative logic level is composed of D2, R2, R3, D3, D4, Q2, R10, R6, R7, R8, R9, Q1 and R4; The 12V and 24V adaptive circuit is composed of D2, R2, R3, Q2, R10, R6, R7, R8, R9, Q1 and R4, and is realized through the resistance matching of the whole system; the anti-reverse connection protection circuit is composed of D2, D3, D4 composition.

[0019] The conversion circuit between the Kline TTL level and the RS232 negative logic level, when the TxPIN3 pin of RS232 outputs a high level, Q2 enters a saturated conduction state, and at this time the K-line pin outputs a low level; when the RS232 The Tx PIN3 pin...

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Abstract

The invention relates to a Kline-RS232 circuit with a function of preventing reverse connection, which mainly comprises three parts including a mutually-converting circuit, 12V and 24V self-adapting circuits and an anti-reverse-connection protective circuit between a Kline TTL level and an RS232 negative logic level. Compared with the prior art, the Kline-RS232 circuit has the characteristics of having adaptability for 12V and 24V systems and the function of preventing the reverse connection and the like.

Description

technical field [0001] The invention relates to a level conversion circuit, in particular to a conversion circuit for converting the TTL level of the Kline bus into the negative logic level of RS232. Background technique [0002] At present, there are many kinds of conversion circuits with the same function on the market, but none of them can be fully applied to mainstream vehicle diagnostic systems, because mainstream vehicle power supplies include 12V and 24V systems, and these conversions are either suitable for 12V systems or 24V systems. It is difficult to apply to both power systems at the same time. At the same time, due to the complexity of the vehicle-mounted circuit, when the wiring terminal connected to the ECU end of the circuit is wrongly connected, the entire circuit system is easily burned, resulting in a waste of user time and an increase in developer costs. Contents of the invention [0003] The object of the present invention is to provide a Kline-to-RS2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 卓斌唐航波冒晓建王俊席李付相
Owner SHANGHAI HIGH ENERGY AUTO ELECTRONIC CO LTD
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