CN206759408U - A kind of on-off circuit - Google Patents
A kind of on-off circuit Download PDFInfo
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- CN206759408U CN206759408U CN201720542512.XU CN201720542512U CN206759408U CN 206759408 U CN206759408 U CN 206759408U CN 201720542512 U CN201720542512 U CN 201720542512U CN 206759408 U CN206759408 U CN 206759408U
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- circuit
- electronic switch
- depletion type
- nmos tube
- signal
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Abstract
The utility model discloses a kind of on-off circuit, including：Signal input part, controllable electronic switch, ON-OFF control circuit and signal output part, the signal input part is connected by controllable electronic switch with signal output part, the output end of the ON-OFF control circuit is connected with controllable electronic switch, and the controllable electronic switch is in normally closed conducting state when electric on not.The utility model is in normally closed conducting state when electric on not by using controllable electronic switch, it is the technical problem being not turned in initial state to overcome existing electronic switch, realize the electronic switch of the normally closed conducting of initial state, mechanical switch is replaced in certain application field, and circuit structure is simple, the volume of equipment can be not only greatly reduced, and the noise of electronic switch and interference are small, circuit influence on periphery is small, has good economic and social benefit.
Description
Technical field
It the utility model is related to signal transmission controlling switch field, more particularly to a kind of on-off circuit.
Background technology
Depletion type NMOS tube：Depletion type N-channel field-effect transistor.
Negative pressure charge pump circuit:It is obtained by theoretical promote of Dickson charge pump, general principle and Dickson charge pump
Consistent, but utilize electric capacity both end voltage difference will not saltus step characteristic, when circuit keeps charge and discharge state, electric capacity two
The voltage difference at end will keep constant.Original hot end is grounded in this case, so that it may obtain the output of negative voltage.
The element for making contact disconnecting circuit, connection circuit, change-over circuit by mechanically actuated claims mechanical switch.Electronic switch
Refer to the running unit that connecting and disconnecting of the circuit is realized using electronic circuit and power electronic devices, including at least a controllable electronics
Driving element, such as IGCT, transistor, FET, controllable silicon, relay.But in actual use, electronic switch
It is primarily referred to as the switch elements such as soft-touch control, inductive switch, audio-switch, wireless switching.
Current existing mechanical switch initial state can be achieved on conducting；And traditional alternative or the electronics of multiselect one
The initial state of class switch is (electric drive device is in cut-off state under non-power-up state) being not turned on, in certain field
Mechanical switch can not be inside replaced, limits the use of electrical type switch.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of electricity realized initial state and can turned on
Sub switch.
Technical scheme is used by the utility model：
A kind of on-off circuit, including：Signal input part, controllable electronic switch, ON-OFF control circuit and signal output part, institute
State signal input part to be connected with signal output part by controllable electronic switch, the output end and controllable electric of the ON-OFF control circuit
Sub switch connects, and the controllable electronic switch is in normally closed conducting state when electric on not.
Preferably, the controllable electronic switch is depletion type NMOS tube, and the drain electrode of the depletion type NMOS tube and signal are defeated
Enter end connection, the source electrode of the depletion type NMOS tube is connected with signal output part, the grid and switch of the depletion type NMOS tube
Control circuit connects.
Preferably, the ON-OFF control circuit is negative pressure charge pump circuit, and it is defeated that the negative pressure charge pump circuit includes power supply
Enter end, control terminal and control signal output, the power input is used to access power supply signal, and the control terminal is used to access
High/low level controling signal, the control signal output are connected with the grid of depletion type NMOS tube.
Preferably, the power supply signal is 3.3V, and the high-level control signal is 3.3V, low level signal 0V, right
Answer, the negative level of the control signal output output of the negative pressure charge pump circuit is -3.3V.
Preferably, the depletion type NMOS tube uses the depletion type NMOS tube that threshold voltage is -0.7V.
Preferably, the on-off circuit is the integrated circuit with chip package.
The beneficial effects of the utility model are：
The utility model is in normally closed conducting state when electric on not by using controllable electronic switch, overcomes existing electricity
Sub switch is the technical problem being not turned in initial state, realizes the electronic switch of the normally closed conducting of initial state, in certain application neck
Mechanical switch is replaced in domain, and circuit structure is simple, can not only greatly reduce the volume of equipment, and electronic switch is made an uproar
Sound and interference are small, and the circuit influence on periphery is small, has good economic and social benefit.
The utility model can be widely applied to various electronic switching circuits.
Brief description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is a kind of electrical block diagram of embodiment of the utility model.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.
As shown in figure 1, in the present embodiment, on-off circuit uses chip package, controllable electronic switch Q1, ON-OFF control circuit
I1 is encapsulated in chip internal, and external interface includes signal input part IN, signal output part OUT, power input VDD, control
Hold VSC and earth terminal GND.Controllable electronic switch is depletion type NMOS tube Q1, and depletion type NMOS tube Q1 drain electrode connecting valve is electric
The signal input part IN on road, the signal output part OUT of source electrode connecting valve circuit；Depletion type NMOS tube Q1 grid connection negative pressure
Charge pump circuit I1 control signal output VGC.
When on-off circuit does not access power input VDD, when chip is not powered, i.e. power input VDD is not applied
In the case of power up signal, the input and output end of on-off circuit are conductings, when power input VDD apply electric signal it
Afterwards, if the control terminal VSC of negative pressure charge pump circuit is low level, negative pressure charge pump circuit I1 control signal output
VGC outputs are high level, and depletion type NMOS is held on；When the control terminal VSC of negative pressure charge pump circuit is high level, negative pressure
Charge pump circuit I1 control signal output VGC outputs are negative levels, depletion type NMOS stoppings.
Depletion type NMOS tube Q1 is using the pipe that exhausts that threshold voltage is -0.7V, and negative pressure charge pump circuit is using typical
The charge pump circuit of Dickson structures, power input vdd voltage are 3.3V, then negative pressure charge pump circuit I1 generations -3.3V
Voltage.
When power input VDD does not apply electric signal, because depletion type NMOS tube is to turn on, therefore IN and OUT
It is conducting, 0~3.3V of input signal can be transferred to output end OUT terminal by on-off circuit；Therefore default state is to lead
Logical.
When power input VDD is applied with 3.3V electric signals, when VSC is low level 0V, Dickson negative pressure charge pump circuits
I1 output is high level 3.3V, and depletion type NMOS tube Q1 is held on；When control terminal VSC is high level 3.3V, Dickson is born
Pressure charge pump circuit I1 control signal output VGC outputs are negative level -3.3V, depletion type NMOS tube Q1 stoppings.
In audio and other field of signal transmissions, the utility model can substitute traditional mechanical switch, realize electricity
The transmission signal of road small size, low noise and low distortion.
Above is preferably implement to be illustrated to of the present utility model, but the invention is not limited to the reality
Example is applied, those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to the utility model spirit
Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (6)
- A kind of 1. on-off circuit, it is characterised in that including：Signal input part, controllable electronic switch, ON-OFF control circuit and signal Output end, the signal input part are connected by controllable electronic switch with signal output part, the output of the ON-OFF control circuit End is connected with controllable electronic switch, and the controllable electronic switch is in normally closed conducting state when electric on not.
- 2. on-off circuit according to claim 1, it is characterised in that the controllable electronic switch is depletion type NMOS tube, The drain electrode of the depletion type NMOS tube is connected with signal input part, and source electrode and the signal output part of the depletion type NMOS tube connect Connect, the grid of the depletion type NMOS tube is connected with ON-OFF control circuit.
- 3. on-off circuit according to claim 2, it is characterised in that the ON-OFF control circuit is negative pressure charge pump electricity Road, the negative pressure charge pump circuit include power input, control terminal and control signal output, and the power input is used for Power supply signal is accessed, the control terminal is used to access high/low level controling signal, the control signal output and depletion type The grid connection of NMOS tube.
- 4. on-off circuit according to claim 3, it is characterised in that the power supply signal is 3.3V, the high level control Signal processed is 3.3V, low level signal 0V, and corresponding, the control signal output output of the negative pressure charge pump circuit is born Level is -3.3V.
- 5. on-off circuit according to claim 4, it is characterised in that the depletion type NMOS tube using threshold voltage is- 0.7V depletion type NMOS tube.
- 6. according to the on-off circuit described in claim any one of 1-5, it is characterised in that the on-off circuit is to be sealed with chip The integrated circuit of dress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720542512.XU CN206759408U (en) | 2017-05-16 | 2017-05-16 | A kind of on-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720542512.XU CN206759408U (en) | 2017-05-16 | 2017-05-16 | A kind of on-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206759408U true CN206759408U (en) | 2017-12-15 |
Family
ID=60618392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720542512.XU Active CN206759408U (en) | 2017-05-16 | 2017-05-16 | A kind of on-off circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206759408U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379071A (en) * | 2018-12-20 | 2019-02-22 | 上海艾为电子技术股份有限公司 | A kind of analog switching circuit |
-
2017
- 2017-05-16 CN CN201720542512.XU patent/CN206759408U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379071A (en) * | 2018-12-20 | 2019-02-22 | 上海艾为电子技术股份有限公司 | A kind of analog switching circuit |
| CN109379071B (en) * | 2018-12-20 | 2023-09-19 | 上海艾为电子技术股份有限公司 | Analog switch circuit |
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