CN202145638U - High voltage simulation switch circuit - Google Patents
High voltage simulation switch circuit Download PDFInfo
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- CN202145638U CN202145638U CN201120291704U CN201120291704U CN202145638U CN 202145638 U CN202145638 U CN 202145638U CN 201120291704 U CN201120291704 U CN 201120291704U CN 201120291704 U CN201120291704 U CN 201120291704U CN 202145638 U CN202145638 U CN 202145638U
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Abstract
The utility model relates to a simulation switch circuit applied under a high voltage environment, wherein the source electrode of a field effect transistor T1 is connected with a resistor R2 and the positive pole of a voltage-stabilizer tube D1, the grid electrode is connected with the other end of a resistor R1, the other end of the resistor R2 and the negative pole of the voltage-stabilizer tube D1, the emitter electrode of an optical coupler T2 is connected with the other end of the resistor R1, the collector electrode is connected with a high voltage end, the cathode is connected with a resistor R3, the anode voltage is kept to be logic ''1'', and the other end of the resistor R3 is connected with a switch control end. When the input voltage signal of the switch control end is logic ''0'', the optical coupler T2 is conductive, the voltage signal input from the high voltage end is divided by the resistor R1, the resistor R2 and the voltage-stabilizer tube D1, and the field effect transistor T1 is turned on to enable two input/output ends to be conductive. When the input voltage signal of the switch control end is logic ''1'', the optical coupler is cut off, the field effect transistor T1 is cut off, and current can not flow from the drain electrode of the field effect transistor T1 to the source electrode.
Description
Affiliated technical field
The utility model relates to a kind of analog switching circuit that is applied under the high voltage environment.
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 there is the shortcoming that under low-voltage, little current condition, to use.
Summary of the invention
Can only be applied in the deficiency under low-voltage, the little current condition in order to overcome existing analog switching circuit, the utility model provides a kind of 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 the voltage-regulator diode protection FET, FET can be operated under the high voltage condition.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 a N type FET T1 connects the positive pole of divider resistance R2 and voltage-stabiliser tube D1, and grid connects divider resistance R1, the other end of divider resistance R2 and the negative pole of voltage-stabiliser tube D1.The emitter of optocoupler T2 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.Two I/O ends that the drain electrode of N type switched field effect pipe T1 and source electrode are the bidirectional analog switch respectively.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 T2 conducting, the voltage signal of high voltage end input is opened FET T1 through the dividing potential drop of switching tube divider resistance R1, R2 and voltage-stabiliser tube D1, makes the conducting of two I/O ends.When switch control end input voltage signal was logical one, optocoupler T2 ended, and voltage is 0 between the grid source electrode of FET T1, and FET T1 ends, and made electric current flow to source electrode from the drain electrode of FET T1.
The beneficial effect of the utility model is, adopts high pressure, big electric current FET in the circuit, makes the conducting electric current of analog switch and improves greatly by withstand voltage.Adopt voltage stabilizing didoe to protect and expand FET, FET can be operated under the high voltage condition.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. FET, T2. optocoupler, D1. voltage-stabiliser tube, R1. divider resistance one, R2. divider resistance two, R3. current-limiting resistance.
Embodiment
In Fig. 1, the source electrode of FET T1 connects the positive pole of divider resistance two R2 and voltage-stabiliser tube D1, and grid connects divider resistance one R1, the other end of divider resistance two R2 and the negative pole of voltage-stabiliser tube D1.The emitter of optocoupler T2 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 T2 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 divider resistance one R1, divider resistance two R2 and voltage-stabiliser tube D1 on FET T1; Make FET T1 conducting, i.e. two I/O ends conducting.
When switch control end input voltage signal was logical one, optocoupler T2 ended.Therefore, the gate-source voltage of FET T1 is 0, makes FET T1, and electric current can't flow to source electrode from the drain electrode of FET T1.
Claims (3)
1. an analog switching circuit that is applied under the high voltage environment is characterized in that: the source electrode connection divider resistance R2 of a N type FET T1 and the positive pole of voltage-stabiliser tube D1, grid connection divider resistance R1, the other end of divider resistance R2 and the negative pole of voltage-stabiliser tube D1.
2. analog switching circuit according to claim 1 is characterized in that: the emitter of optocoupler T2 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.
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 |
|---|---|---|---|
| CN201120291704U CN202145638U (en) | 2011-08-12 | 2011-08-12 | High voltage simulation switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120291704U CN202145638U (en) | 2011-08-12 | 2011-08-12 | High voltage simulation switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202145638U true CN202145638U (en) | 2012-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120291704U Expired - Fee Related CN202145638U (en) | 2011-08-12 | 2011-08-12 | High voltage simulation switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202145638U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166618A (en) * | 2011-12-14 | 2013-06-19 | 赵恩海 | Isolating-driving high-voltage analog switch circuit |
| CN107612534A (en) * | 2017-09-18 | 2018-01-19 | 深圳市沃特沃德股份有限公司 | On-off circuit and terminal device |
-
2011
- 2011-08-12 CN CN201120291704U patent/CN202145638U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166618A (en) * | 2011-12-14 | 2013-06-19 | 赵恩海 | Isolating-driving high-voltage analog switch circuit |
| CN107612534A (en) * | 2017-09-18 | 2018-01-19 | 深圳市沃特沃德股份有限公司 | On-off circuit and terminal device |
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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: 20120215 Termination date: 20130812 |