CN103166618A - Isolating-driving high-voltage analog switch circuit - Google Patents
Isolating-driving high-voltage analog switch circuit Download PDFInfo
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- CN103166618A CN103166618A CN2011104181731A CN201110418173A CN103166618A CN 103166618 A CN103166618 A CN 103166618A CN 2011104181731 A CN2011104181731 A CN 2011104181731A CN 201110418173 A CN201110418173 A CN 201110418173A CN 103166618 A CN103166618 A CN 103166618A
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- voltage
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- optocoupler
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- divider resistance
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Abstract
The invention discloses an analog switch circuit which is driven by photon coupled isolating and is used in high-voltage environment. A source electrode of a field effect tube T1 is connected with a resistor R2 and an anode of a voltage-regulator tube D1. A grid electrode of the field effect tube T1 is connected with a resistor R1, the other end of the resistor R2 and a cathode of the voltage-regulator tube D1. An emitting electrode of an optocoupler T2 is connected with the other end of the resistor R1. A collector electrode of the optocoupler T2 is connected with a high-voltage end. A cathode of the optocoupler T2 is connected with a resistor R3. An anode voltage is kept in a state of logic '1'. The other end of the resistor R3 is connected with a switch control end. When an input voltage signal of the switch control end is logic '0', the optocoupler T2 is conducted, a voltage signal input by a high-voltage end turns on the field effect tube T1 by voltage splitting through the resistor R1, the resistor R2 and the voltage-regulator tube D1, and accordingly two input/output ends are conducted. When the input voltage signal of the switch control end is logic '1', the optocoupler T2 ends, the field effect tube T1 ends, and a current cannot flow from a drain electrode of the field effect tube T1 to a source electrode of the field effect tube T1.
Description
Affiliated technical field
The present invention relates to a kind of employing light-coupled isolation and drive, be applied in the analog switching circuit under high voltage environment.
Background technology
Analog switch is a kind of circuit that often uses in analog circuit, in the electronic equipments such as communication, radar, computer, control automatically, measuring instrument, is widely used.At present, bidirectional analog switch circuit is mainly realized by devices such as application-specific integrated circuit (ASIC), optical relays.But all there is the shortcoming that to use under low-voltage, little current condition.
Summary of the invention
Can only be applied in deficiency under low-voltage, little current condition in order to overcome existing analog switching circuit, the invention provides a kind of analog switching circuit, this main circuit will adopt high pressure, large electric current field effect transistor, can improve On current and cut-off is withstand voltage.Adopt the voltage-regulator diode protection field effect transistor, field effect transistor can be operated under high voltage condition.Adopt simultaneously optical couple isolation drive circuit, simplified the complexity of circuit, reduced failure rate.
The technical solution adopted for the present invention to solve the technical problems is: the source electrode of a N-type field effect transistor 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, anodic bonding logical one level.The other end connecting valve control end of current-limiting resistance R3.The drain electrode of N-type switched field effect pipe T1 and source electrode are respectively 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 T2 conducting, the voltage signal of high voltage end input is opened field effect transistor T1 by 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 is logical one, optocoupler T2 cut-off, between the grid source electrode of field effect transistor T1, voltage is 0, field effect transistor T1 cut-off makes electric current flow to source electrode from the drain electrode of field effect transistor T1.
The invention has the beneficial effects as follows, adopt high pressure, large electric current field effect transistor in circuit, make On current and the withstand voltage raising greatly of cut-off of analog switch.Adopt the voltage-regulator diode protection field effect transistor, field effect transistor can be operated under high voltage condition.Adopt simultaneously optocoupler control simulation switch, simplified the complexity of circuit, reduced failure rate.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is circuit theory diagrams of the present invention.
In figure, T1. field effect transistor, 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 field effect transistor 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 hold is logical one.The other end connecting valve control end of current-limiting resistance R3.
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.Due to the input voltage of the high voltage end voltage much larger than two I/O ends, the input voltage of high voltage end upward produces enough large gate source voltage by divider resistance one R1, divider resistance two R2 and voltage-stabiliser tube D1 being on the scene effect pipe T1, make field effect transistor T1 conducting, i.e. two I/O ends conducting.
When switch control end input voltage signal is logical one, optocoupler T2 cut-off.Therefore, the gate-source voltage of field effect transistor T1 is 0, makes field effect transistor T1, and electric current can't flow to source electrode from the drain electrode of field effect transistor T1.
Claims (3)
1. one kind is adopted optocoupler to drive, be applied in the analog switching circuit under high voltage environment, it is characterized in that: the source electrode of a N-type field effect transistor 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.
2. analog switching circuit according to claim 1, is characterized in that: the other end of the emitter connection divider resistance R1 of optocoupler T2, collector electrode connection high voltage end, the negative electrode connection current-limiting resistance R3 of input light-emitting diode, anodic bonding logical one level.
3. bidirectional analog switch circuit according to claim 1, is characterized in that: the other end connecting valve control end of current-limiting resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104181731A CN103166618A (en) | 2011-12-14 | 2011-12-14 | Isolating-driving high-voltage analog switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104181731A CN103166618A (en) | 2011-12-14 | 2011-12-14 | Isolating-driving high-voltage analog switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103166618A true CN103166618A (en) | 2013-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104181731A Pending CN103166618A (en) | 2011-12-14 | 2011-12-14 | Isolating-driving high-voltage analog switch circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348826B1 (en) * | 2005-03-18 | 2008-03-25 | Qspeed Semiconductor Inc. | Composite field effect transistor |
| CN202145638U (en) * | 2011-08-12 | 2012-02-15 | 赵恩海 | High voltage simulation switch circuit |
-
2011
- 2011-12-14 CN CN2011104181731A patent/CN103166618A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348826B1 (en) * | 2005-03-18 | 2008-03-25 | Qspeed Semiconductor Inc. | Composite field effect transistor |
| CN202145638U (en) * | 2011-08-12 | 2012-02-15 | 赵恩海 | High voltage simulation switch circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 211106, room 1002, building 17, Qingjiang, Xiyuan, 418 Jiangdong North Road, Xiaguan District, Jiangsu, Nanjing Applicant after: Zhao Enhai Address before: 211106 No. 20, Qinhuai Road, Jiangning District, Jiangsu, Nanjing 305 Applicant before: Zhao Enhai |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130619 |