CN102420597B - Voltage selector - Google Patents
Voltage selector Download PDFInfo
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- CN102420597B CN102420597B CN 201110391358 CN201110391358A CN102420597B CN 102420597 B CN102420597 B CN 102420597B CN 201110391358 CN201110391358 CN 201110391358 CN 201110391358 A CN201110391358 A CN 201110391358A CN 102420597 B CN102420597 B CN 102420597B
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Abstract
The application discloses voltage selector, voltage selector is in add the supplementary branch road that switches on of first switch in the first switch circuit, add the supplementary branch road that switches on of second switch in the second switch circuit, when this voltage selector output switches over, in voltage switch earlier stage, the supplementary branch road that switches on of switch in the switch circuit at the voltage place of treating the output switches on with the switch owner and switches on the branch road and all switch on, carry out quick charge for the output of this voltage selector, thereby make output voltage rise fast, and then can make voltage selector's output voltage transition to the voltage of treating the output fast, voltage selector's switching speed has been accelerated.
Description
Technical field
The application relates to the voltage selector technical field, particularly relates to a kind of voltage selector that can fast conducting.
Background technology
The major function of voltage selector is to select a required voltage output from two existing voltages, under some workplace, need the output voltage fast transition to selected voltage, this just requires voltage selector can realize the quick switching of voltage, export fast required voltage, but, traditional voltage selector is realized the output of selected voltage usually by a road actuating switch, the conducting speed of this conducting method is limited, and output voltage can not realize that fast transition arrives selected voltage.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of voltage selector, so that solution/to realize, technical scheme is as follows:
A kind of voltage selector comprises: the first switching circuit and second switch circuit, wherein, during described the first switching circuit conducting, by the first Voltage-output, during described second switch circuit turn-on, second voltage is exported;
Described the first switching circuit comprises that the leading logical branch road of the first switch is connected with the auxiliary conducting branch circuit parallel connection of the first switch the first parallel branch obtained, and an end of this first parallel branch is inputted the first voltage, and the other end connects output;
Described second switch circuit comprises that the leading logical branch road of second switch is connected with the auxiliary conducting branch circuit parallel connection of second switch the second parallel branch obtained, an end input second voltage of this second parallel branch, and the other end connects output.
Preferably, the leading logical branch road of described the first switch comprises: the first switching tube be connected in series and second switch pipe, wherein, the first end of described the first switching tube is inputted described the first voltage, the second end connects the second end of described second switch pipe, the first end of described second switch pipe connects described output, and the control end of described the first switching tube inputs the first control signal, and the control end of described second switch pipe is inputted the second control signal.
Preferably, the auxiliary conducting branch road of described the first switch comprises: the 3rd switching tube, the first end of described the 3rd switching tube connects described output, the second end is inputted described the first voltage, control end input the 3rd control signal.
Preferably, described the first switching circuit also comprises: the first bias pressure circuit, and this first bias pressure circuit comprises: the 4th switching tube be connected in series and the 5th switching tube, wherein:
The second end of described the 4th switching tube is inputted described the first voltage, and first end connects the second end of described the 5th switching tube, and this first end connects the second end of described second switch pipe, and control end connects the first end of described the 3rd switching tube;
The first end of described the 5th switching tube connects described output, and control end is inputted described the first voltage.
Preferably, the leading logical branch road of described second switch comprises: the 6th switching tube be connected in series and the 7th switching tube, the first end of described the 6th switching tube is inputted described second voltage, and the second end connects the second end of described the 7th switching tube, control end input the 4th control signal;
The first end of described the 7th switching tube connects output, control end input the 3rd control signal.
Preferably, the auxiliary conducting branch road of described second switch comprises: the 8th switching tube, and its first end connects described output, and the second end is inputted described second voltage, and control end is inputted described the second control signal.
Preferably, described second switch branch road also comprises: the second bias pressure circuit, and this second bias pressure circuit comprises: the 9th switching tube be connected in series and the tenth switching tube, wherein,
The second end of described the 9th switching tube is inputted described second voltage, and first end connects the second end of described the tenth switching tube, and control end connects the first end of described the 8th switching tube;
The first end of described the tenth switching tube connects described output, and control end is inputted described second voltage.
Preferably, the described logic control element that also comprises, for generation of described the first control signal, the second control signal, the 3rd control signal and the 4th control signal.
Preferably, described the 3rd switching tube is N-type metal-semiconductor field effect metal-oxide-semiconductor, and first end is that source electrode, the second end are drain electrode, and control end is grid.
Preferably, described the 8th switching tube is the N-type metal-oxide-semiconductor, and described first end is that source electrode, the second end are grid for drain electrode, described control end.
The technical scheme provided from above the embodiment of the present application, described voltage selector is set up the auxiliary conducting branch road of the first switch in described the first switching circuit, set up the auxiliary conducting branch road of second switch in the second switch circuit, when this voltage selector output is switched, in the voltage switching in earlier stage, the leading logical equal conducting of branch road of the auxiliary conducting branch road of switch in the switching circuit at voltage place to be exported and switch, for the output of this voltage selector carries out quick charge, thereby make the output end voltage fast rise, and then the output voltage fast transition that can make voltage selector is to voltage to be exported, accelerated the switch speed of voltage selector.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The electrical block diagram that Fig. 1 is a kind of voltage selector of the embodiment of the present application;
The oscillogram of the control signal that Fig. 2 is the embodiment of the present application voltage selector;
Oscillogram corresponding to output charging process when the voltage selector that Fig. 3 provides for the embodiment of the present application switches to the first voltage by second voltage.
Embodiment
The embodiment of the present application provides a kind of voltage selector, comprises the first switching circuit and second switch circuit, wherein, during described the first switching circuit conducting, by the first Voltage-output, during described second switch circuit turn-on, second voltage is exported; Described the first switching circuit comprises that the leading logical branch road of the first switch is connected with the auxiliary conducting branch circuit parallel connection of the first switch the first parallel branch obtained, and an end of this first parallel branch is inputted the first voltage, and the other end connects output; Described second switch circuit comprises that the leading logical branch road of second switch is connected with the auxiliary conducting branch circuit parallel connection of second switch the second parallel branch obtained, an end input second voltage of this second parallel branch, and the other end connects output.
Described voltage selector has been set up respectively the auxiliary conducting branch road of a switch in two switching circuits, when voltage selector is switched, the leading logical branch road of switch in the switching circuit at voltage place to be exported and the auxiliary equal conducting of conducting branch road of switch, output is carried out to quick charge, make the voltage fast rise of output, and then fast transition is to voltage to be exported, thereby accelerated the switch speed of voltage selector.
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all should belong to the scope of the application's protection.
Refer to Fig. 1, show the electrical block diagram of a kind of voltage selector of the embodiment of the present application, this voltage selector comprises the first switching circuit 100 and second switch circuit 200, wherein:
Described the first switching circuit 100 comprises the leading logical branch road of the first switch and the auxiliary conducting branch road of the first switch, and the leading logical branch road of described the first switch comprises the first switching tube M1 and second switch pipe M2, and the auxiliary conducting branch road of described the first switch is the 3rd switching tube M3.
Described the first switching tube M1 connects with described second switch pipe M2, and wherein, the input of the first end of described the first switching tube M1 has described the first voltage V1, and the second end connects the second end of described second switch pipe M2, and the control end input has the first control signal C1;
The first end of described second switch pipe M2 connects the output end vo of this voltage selector, and the control end input has the second control signal C2.
The first end of described the 3rd switching tube M3 connects described output end vo, and the second end input has described the first voltage V1, and the control end input has the 3rd control signal C3.
Described second switch circuit 200 comprises the leading logical branch road of second switch and the auxiliary conducting branch road of second switch, and the leading logical branch road of described second switch comprises the 6th switching tube M6 and the 7th switching tube M7, and the auxiliary conducting branch road of described second switch is the 8th switching tube M8.
Described the 6th switching tube M6 connects with described the 7th switching tube M7, and wherein, the input of the first end of described the 6th switching tube M6 has second voltage V2, the second end to connect the second end of described the 7th switching tube M7, and the control end input has the 4th control signal C4;
The first end of described the 7th switching tube M7 connects described output end vo, and the control end input has described the 3rd control signal C3.
The auxiliary conducting branch road of described second switch comprises the 8th switching tube M8, and its first end connects described output, and the second end input has described second voltage V2, and the control end input has described the second control signal C2.
Concrete, the course of work of this voltage selector is as follows:
When the output voltage of this voltage selector switches to the first voltage V1 by described second voltage V2, now, the first switching circuit 100 is in conducting state, second switch circuit 200 is in cut-off state, concrete, the first control signal C1 controls described the first switching tube M1 conducting, the second control signal C2 controls second switch pipe M2 conducting, the 3rd control signal C3 controls the 3rd switching tube M3 conducting, like this in switching in earlier stage, the first voltage V1 is by the first switching tube M1, the leading logical branch road of the first switch that second switch pipe M2 forms, and the auxiliary conducting branch road of the first switch of the 3rd switching tube M3 formation is that output end vo is charged, make the voltage on output end vo be climbed to described the first voltage V1 and then output.
In like manner, when described voltage selector switches to second voltage V2 by the first voltage V1, second switch circuit 200 is in conducting state, the first switching circuit 100 is in cut-off state, concrete, the 4th control signal C4 controls the 6th switching tube M6 conducting, the 3rd control signal C3 controls the 7th switching tube M7 conducting, the second control signal C2 controls the 8th switching tube M8 conducting, now, second voltage V2 is charged to output end vo through the leading logical branch road of second switch and the auxiliary conducting branch road of second switch, make the voltage on output end vo reach fast second voltage V2 output, realize that the output voltage fast transition of voltage selector is to second voltage V2.
Preferably, the first switching tube M1 in the present embodiment, second switch pipe M2, the 6th switching tube M6 and the 7th switching tube M7 are P type metal-oxide-semiconductor, and first end is that source electrode, the second end are grid for drain electrode, control end.
The 3rd switching tube M3 and the 8th switching tube M8 are the N-type metal-oxide-semiconductor, and first end is that source electrode, the second end are grid for drain electrode, control end.
Refer to Fig. 2, show the waveform schematic diagram of four tunnel control signals,
Described the first control signal C1, the second control signal C2, the 3rd control signal C3 and the 4th control signal C4 specifically can send by logic control circuit.This logic control circuit can be by microcontroller implementations such as single-chip microcomputers.
The control signal that the first control signal C1 and the 3rd control signal C3 are the low and high level complementation, the second control signal C2 and the 4th control signal C4 are also the control signal of low and high level complementation.
When the first control signal C1 is low level, the first switching tube M1 conducting, when the 3rd control signal C3 is high level, the 3rd switching tube M3 conducting;
When the second control signal C2 is low level, second switch pipe M2 conducting, when the 4th control signal C4 is high level, the 8th switching tube M8 conducting.
To be grid voltage Vg be greater than threshold voltage vt h to the bias voltage of source voltage Vs to the turn-on condition of the 3rd switching tube M3 and the 8th switching tube M8, when grid voltage Vg is less than threshold voltage vt h to the bias voltage of source voltage Vs, N-type metal-oxide-semiconductor cut-off, therefore, in the switching early stage that is switched to the first voltage V1 by second voltage V2, along with the voltage of output end vo end rises gradually, the source voltage of the 3rd switching tube M3 rises gradually, when the difference of the grid voltage of the 3rd switching tube M3 and source voltage is less than described threshold voltage, described the 3rd switching tube cut-off, after this, the leading logical branch road of the first switch is still in conducting state, by the leading logical branch road of the first switch, output end vo is charged.
Above-mentioned carry out charging process as shown in Figure 3 for output, by second voltage V2, be switched in the situation of the first voltage V1, in switching in earlier stage, i.e. in the RS stage, by the leading logical branch road of the first switch and the auxiliary conducting branch road of the first switch, output end vo is carried out to quick charge, charge rate is large, at the S point, due to the 3rd switching tube M3 cut-off, therefore, the ST stage is charged to output end vo by the leading logical branch road of the first switch, until output reaches the first voltage V1.In like manner, when the output voltage of voltage selector is switched to second voltage V2 by the first voltage V1, identical with above-mentioned charging process to the charging process of output end vo, also be divided into two stages, repeat no more herein.
Preferably, refer to Fig. 1, the first switching circuit in described voltage selector also comprises the first bias pressure circuit 300, and described second switch circuit also comprises the second bias pressure circuit 400.
Described the first bias pressure circuit 300 comprises the 4th switching tube M4 and the 5th switching tube M5 be connected in series.
The second end of described the 4th switching tube M4 is inputted described the first voltage V1, and first end connects the second end of described the 5th switching tube M5, and this first end connects the second end of described the first switching tube, and control end connects the first end of described the 3rd switching tube M3; The first end of described the 5th switching tube M5 connects described output end vo, and the control end input has described the first voltage V1.
The effect of described the first bias pressure circuit 300 is the first switching tube M1 and the second switch pipe M2 on the leading logical branch road of protection the first switch; concrete; when the output voltage V o of voltage selector switches to second voltage V2 by the first voltage V1, the first switching circuit 100 is in cut-off state.The 4th switching tube M4 in the first bias pressure circuit and the 5th switching tube M5 are equivalent to two resistance and are serially connected between the first voltage V1 and output end vo, because output end voltage now is V2, the A terminal potential is the dividing potential drop of equivalent resistance to the first voltage V1 and second voltage V2, like this, during voltage selector output voltage V o switches to the first voltage V1 by second voltage V2, the A point can be in floating dummy status, but be tending towards gradually a stable potential, burn out the generation of the phenomenon of the first switching tube M1 or second switch pipe M2 thereby the current potential of having avoided A to order is too high, therefore, this the first bias pressure circuit 300 plays the effect of protection the first switching tube M1 and second switch pipe M2.
Described the second bias pressure circuit 400 comprises the 9th switching tube M9 and the tenth switching tube M10 be connected in series.
The second end of described the 9th switching tube M9 is inputted described second voltage V2, and first end connects the second end of described the tenth switching tube M10, and control end connects the first end of described the 8th switching tube M8; The first end of described the tenth switching tube M10 connects described output end vo, and control end is inputted described second voltage V2.
The effect of the second bias pressure circuit 400 is protection the 6th switching tube M6 and the 7th switching tube M7, and concrete, when the output voltage V o of voltage selector switches to the first voltage V1 by second voltage, the second switch circuit is in cut-off state.The 9th switching tube M9 in the second bias pressure circuit 400 and the tenth switching tube M10 are equivalent to two resistance and are connected between second voltage V2 and output end vo, because output end voltage now is V1, the B terminal potential is the dividing potential drop of equivalent resistance to second voltage V2 and the first voltage V1, during voltage selector output voltage V o switches to the first voltage V1 by second voltage V2, the B point can be in floating dummy status, but be tending towards gradually a stable potential, burn out the generation of the phenomenon of the 9th switching tube M9 or the tenth switching tube M10 thereby the current potential of having avoided B to order is too high, therefore, this the second bias pressure circuit 400 plays the effect of protection the 9th switching tube M9 and the tenth switching tube M10.
It should be noted that, the substrate of the N-type metal-oxide-semiconductor in the embodiment of the present application connects earth terminal, guarantees the normal operation of N-type metal-oxide-semiconductor.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and between each embodiment, identical similar part is mutually referring to getting final product, and each embodiment stresses is the difference with other embodiment.Those of ordinary skills in the situation that do not pay creative work, can understand and implement.
It should be noted that, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operating space, and not necessarily requires or imply between these entities or operation the relation of any this reality or sequentially of existing.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (4)
1. a voltage selector, is characterized in that, comprising: the first switching circuit and second switch circuit, wherein, during described the first switching circuit conducting, by the first Voltage-output, during described second switch circuit turn-on, second voltage is exported;
Described the first switching circuit comprises the leading logical branch road of the first switch, the auxiliary conducting branch road of the first switch and the first bias pressure circuit, wherein:
Described second switch circuit comprises the leading logical branch road of second switch and the auxiliary conducting branch road of second switch;
The leading logical branch road of described the first switch comprises: the first switching tube be connected in series and second switch pipe, the first end of described the first switching tube is inputted described the first voltage, the second end connects the second end of described second switch pipe, the first end of described second switch pipe connects the output of this voltage selector, and the control end of described the first switching tube is inputted the first control signal, the control end of described second switch pipe is inputted the second control signal;
The auxiliary conducting branch road of described the first switch comprises: the 3rd switching tube, and the first end of described the 3rd switching tube connects described output, the second end is inputted described the first voltage, control end input the 3rd control signal;
Described the first bias pressure circuit comprises: the 4th switching tube be connected in series and the 5th switching tube, the second end of described the 4th switching tube is inputted described the first voltage, first end connects the second end of described the 5th switching tube, and this first end connects the second end of described second switch pipe, and control end connects the first end of described the 3rd switching tube; The first end of described the 5th switching tube connects described output, and control end is inputted described the first voltage;
Described second switch circuit comprises the leading logical branch road of second switch, the auxiliary conducting branch road of second switch and the second bias pressure circuit, wherein:
The leading logical branch road of described second switch comprises: the 6th switching tube be connected in series and the 7th switching tube, and the first end of described the 6th switching tube is inputted described second voltage, and the second end connects the second end of described the 7th switching tube, control end input the 4th control signal; The first end of described the 7th switching tube connects output, control end input the 3rd control signal;
The auxiliary conducting branch road of described second switch comprises: the 8th switching tube, and its first end connects described output, and the second end is inputted described second voltage, and control end is inputted described the second control signal;
Described the second bias pressure circuit comprises: the 9th switching tube be connected in series and the tenth switching tube, the second end of described the 9th switching tube is inputted described second voltage, first end connects the second end of described the tenth switching tube, and described the 9th switching tube is connected the common port of described the 6th switching tube and described the 7th switching tube with the common port of described the tenth switching tube, control end connects the first end of described the 8th switching tube; The first end of described the tenth switching tube connects described output, and control end is inputted described second voltage.
2. voltage selector according to claim 1, is characterized in that, described voltage selector also comprises logic control element, for generation of described the first control signal, the second control signal, the 3rd control signal and the 4th control signal.
3. voltage selector according to claim 1, is characterized in that, described the 3rd switching tube is N-type metal-semiconductor field effect metal-oxide-semiconductor, and first end is that source electrode, the second end are drain electrode, and control end is grid.
4. voltage selector according to claim 1, is characterized in that, described the 8th switching tube is the N-type metal-oxide-semiconductor, and described first end is that source electrode, the second end are grid for drain electrode, described control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110391358 CN102420597B (en) | 2011-11-30 | 2011-11-30 | Voltage selector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110391358 CN102420597B (en) | 2011-11-30 | 2011-11-30 | Voltage selector |
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| CN102420597A CN102420597A (en) | 2012-04-18 |
| CN102420597B true CN102420597B (en) | 2013-12-25 |
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| CN117811371B (en) * | 2024-02-28 | 2024-06-25 | 杰华特微电子股份有限公司 | Maximum input voltage selection output circuit, method and chip using same |
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| CN1703120A (en) * | 2004-05-24 | 2005-11-30 | 三星Sdi株式会社 | Light emission device and power supply therefor |
| CN1988388A (en) * | 2005-12-22 | 2007-06-27 | 三洋电机株式会社 | Voltage selecting circuit |
| CN101630955A (en) * | 2009-06-09 | 2010-01-20 | 中国人民解放军国防科学技术大学 | High-performance level switch circuit with accelerating tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070111791A (en) * | 2006-05-19 | 2007-11-22 | 삼성전자주식회사 | Display device, and driving apparatus and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1703120A (en) * | 2004-05-24 | 2005-11-30 | 三星Sdi株式会社 | Light emission device and power supply therefor |
| CN1988388A (en) * | 2005-12-22 | 2007-06-27 | 三洋电机株式会社 | Voltage selecting circuit |
| CN101630955A (en) * | 2009-06-09 | 2010-01-20 | 中国人民解放军国防科学技术大学 | High-performance level switch circuit with accelerating tube |
Non-Patent Citations (2)
| Title |
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| 傅秋儒.常规电压切换回路存在问题及改进措施.《福建电力与电工》.1997,第17卷(第3期),全文. |
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