CN202178745U - Isolated driving bidirectional analog switch circuit - Google Patents
Isolated driving bidirectional analog switch circuit Download PDFInfo
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- CN202178745U CN202178745U CN2011202769994U CN201120276999U CN202178745U CN 202178745 U CN202178745 U CN 202178745U CN 2011202769994 U CN2011202769994 U CN 2011202769994U CN 201120276999 U CN201120276999 U CN 201120276999U CN 202178745 U CN202178745 U CN 202178745U
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- bidirectional analog
- divider resistance
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Abstract
The utility model relates to an isolated driving bidirectional analog switch circuit which connects source electrodes of two field-effect transistors, T1and T2, with a resistor R2, and grid electrodes with the other end of the resistor R2 and a resistor R1. An emitting electrode of an optical coupler T3 is connected with the other end of the resistor R1, and a collector electrode is connected with a high voltage terminal, a cathode is connected with a resistor R3, and the anode voltage is maintained as logic 1. The other end of the resistor R3 is connected with a switch control terminal. When the switch control terminal is input into a logic 0 voltage signal, the optical coupler T3 is conducted, and a voltage signal input by a high voltage terminal turns on the field-effect transistors, T1 and T2, after the voltage division by divider resistors R1 and R2, and two input/output terminals are conducted. When a logic 1 voltage signal is input into the switch control terminal, the optical coupler T3 is cut off, the field-effect transistors, T1 and T2, are cut off, and the two input/output terminals are also cut off.
Description
Affiliated technical field
The utility model relates to a kind of bidirectional analog switching circuit that adopts optical couple isolation drive circuit.
Background technology
Analog switch is a kind of circuit that often uses in the analog circuit, in electronic equipments such as communication, radar, computer, control automatically, measuring instrument, is widely used.At present, the bidirectional analog switching circuit is mainly realized through devices such as application-specific integrated circuit (ASIC), optical relays.But all exist the conducting electric current little, by withstand voltage shortcoming such as low.
Summary of the invention
Little in order to overcome existing bidirectional analog switching circuit conducting electric current, by withstand voltage low deficiency, the utility model provides a kind of bidirectional analog switching circuit, and this circuit mainly adopts high pressure, big electric current FET, can improve the conducting electric current and end withstand voltage.Adopt optical couple isolation drive circuit simultaneously, simplified the complexity of circuit, reduced failure rate.
The utility model solves the technical scheme that its technical problem adopted: the source electrode of two N type switched field effect pipe T1, T2 is connected with divider resistance R2, and the other end and the divider resistance R1 of grid and divider resistance R2 are connected.The emitter of optocoupler T3 connects the other end of divider resistance R1, and collector electrode connects high voltage end, and the negative electrode of input light-emitting diode connects current-limiting resistance R3, and anode connects the logical one level.The other end of current-limiting resistance R3 connects the switch control end.The drain electrode of N type switched field effect pipe T1, T2 is two I/O ends of bidirectional analog switch.The high voltage end input voltage is much larger than the voltage of two I/O ends.When switch control end input voltage signal is logical zero, optocoupler T3 conducting, the voltage signal of high voltage end input is opened FET T1 and T2 through the dividing potential drop of switching tube divider resistance R1 and R2, makes the conducting of two I/O ends.When switch control end input voltage signal was logical one, optocoupler T3 ended, and voltage is 0 between the grid source electrode of FET T1 and T2, and FET T1 and T2 end, and two I/O ends are ended.
The beneficial effect of the utility model is, adopts high pressure, big electric current FET in the circuit, makes the conducting electric current of bidirectional analog switch and improves greatly by withstand voltage.Adopt optocoupler control analog switch simultaneously, simplified the complexity of circuit, reduced failure rate.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the circuit theory diagrams of the utility model.
Among the figure, T1.N type switched field effect pipe one, T2.N type switched field effect pipe two, T3. optocoupler, R1. divider resistance one, R2. divider resistance two, R3. current-limiting resistance.
Embodiment
In Fig. 1, N type switched field effect pipe one T1 is connected divider resistance two R2 with the source electrode of N type switched field effect pipe two T2.Their grid connects the other end and divider resistance one R1 of divider resistance two R2.The emitter of optocoupler T3 connects the other end of divider resistance one R1, and collector electrode connects high voltage end, and the negative electrode of input light-emitting diode connects current-limiting resistance R3, and the anode level remains logical one.The other end of current-limiting resistance R3 connects the switch control end.
As shown in Figure 1, when switch control end input voltage signal is logical zero, optocoupler T3 conducting, the voltage between its collector and emitter is approximately 0.Because the input voltage of high voltage end is much larger than the voltage of two I/O ends; The input voltage of high voltage end produces enough big gate source voltage through the parasitic diode of divider resistance one R1, divider resistance two R2 and N type switched field effect pipe one T1 and N type switched field effect pipe two T2 on N type switched field effect pipe one T1 and N type switched field effect pipe two T2; Make N type switched field effect pipe one T1 and the two T2 conductings of N type switched field effect pipe, i.e. two I/O ends conducting.
When switch control end input voltage signal was logical one, optocoupler T3 ended.Therefore, the gate-source voltage of N type switched field effect pipe one T1 and N type switched field effect pipe two T2 is 0, and N type switched field effect pipe one T1 and N type switched field effect pipe two T2 are ended, and promptly two I/O ends end.
Claims (3)
1. bidirectional analog switching circuit that adopts light-coupled isolation to drive is characterized in that: the source electrode of two N type switched field effect pipe T1, T2 is connected with divider resistance R2, and the other end and the divider resistance R1 of grid and divider resistance R2 are connected.
2. bidirectional analog switching circuit according to claim 1; It is characterized in that: the emitter of optocoupler T3 connects the other end of divider resistance R1; Collector electrode connects high voltage end, and the negative electrode of input light-emitting diode connects current-limiting resistance R3, and anode connects the logical one level.
3. bidirectional analog switching circuit according to claim 1 is characterized in that: the other end of current-limiting resistance R3 connects the switch control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202769994U CN202178745U (en) | 2011-08-02 | 2011-08-02 | Isolated driving bidirectional analog switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202769994U CN202178745U (en) | 2011-08-02 | 2011-08-02 | Isolated driving bidirectional analog switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202178745U true CN202178745U (en) | 2012-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202769994U Expired - Fee Related CN202178745U (en) | 2011-08-02 | 2011-08-02 | Isolated driving bidirectional analog switch circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202178745U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857209A (en) * | 2012-09-29 | 2013-01-02 | 黑龙江大学 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
| CN103166617A (en) * | 2011-12-14 | 2013-06-19 | 赵恩海 | Analog switch circuit driven by optical coupling |
| CN107666017A (en) * | 2016-07-27 | 2018-02-06 | 三星Sdi株式会社 | Battery system for motor vehicle driven by mixed power |
-
2011
- 2011-08-02 CN CN2011202769994U patent/CN202178745U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166617A (en) * | 2011-12-14 | 2013-06-19 | 赵恩海 | Analog switch circuit driven by optical coupling |
| CN102857209A (en) * | 2012-09-29 | 2013-01-02 | 黑龙江大学 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
| CN102857209B (en) * | 2012-09-29 | 2015-03-04 | 黑龙江大学 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
| CN107666017A (en) * | 2016-07-27 | 2018-02-06 | 三星Sdi株式会社 | Battery system for motor vehicle driven by mixed power |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhao Enhai Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Zhao Enhai Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120328 Termination date: 20130802 |