CN102435820B - Overvoltage detection circuit - Google Patents
Overvoltage detection circuit Download PDFInfo
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- CN102435820B CN102435820B CN 201110391552 CN201110391552A CN102435820B CN 102435820 B CN102435820 B CN 102435820B CN 201110391552 CN201110391552 CN 201110391552 CN 201110391552 A CN201110391552 A CN 201110391552A CN 102435820 B CN102435820 B CN 102435820B
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Abstract
The application discloses an overvoltage detection circuit that comprises a voltage sampling circuit, a setting circuit, a decision circuit, a first control switch, a second control switch, a third control switch, a first voltage-controlled current generation unit and a second current generation unit. When the overvoltage detection circuit detects that an input voltage is higher than a preset voltage, an output low level signal controls the second control switch to be broken, so that the overvoltage detection circuit will not detect an input voltage signal; therefore, it is avoided that a noise signal is input into the overvoltage detection circuit and thus the anti-noise performance of the overvoltage detection circuit can be strengthened; meanwhile, power consumption of the overvoltage detection circuit can also be reduced.
Description
Technical field
The application relates to the voltage detecting technical field, particularly relates to over-voltage detection circuit.
Background technology
Over-voltage detection circuit is the circuit that produces output signal when input voltage surpasses predeterminated voltage.Traditional over-voltage detection circuit is made up of comparer and sampling resistor, comparer is mimic channel, its noise tolerance is more weak, if over-voltage detection circuit is operated under the big noise circumstance, and near comparer turn threshold point during detection signal, if comparer speed is enough fast, near the energy response noises, and noise is also under the bigger situation, output terminal can produce bigger noise, be the output signal of output terminal can be between high-low level unordered beating, the power consumption of over-voltage detection circuit also can obviously increase.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of over-voltage detection circuit, and to solve the problem that existing over-voltage detection circuit noise is big, power consumption is big, technical scheme is as follows:
A kind of over-voltage detection circuit comprises: voltage sampling circuit, setting circuit, decision circuit, first gauge tap, second gauge tap, the 3rd gauge tap, the first voltage controlled current generation unit and second current generating unit,
The input end input of described voltage sampling circuit has input voltage, output terminal to connect first end of described first gauge tap, is used for obtaining the input voltage sampled signal;
Second end of described first gauge tap connects the control end of the described first voltage controlled current generation unit, the control end input control signal of first gauge tap;
The positive pole of the described first voltage controlled current generation unit connects first end of described second gauge tap, and negative pole connects earth terminal;
Second end of described second gauge tap connects the negative pole of described second current generating unit by described the 3rd gauge tap, wherein, second end of described the 3rd gauge tap connects the negative pole of described second current generating unit, first end connects second end of described second gauge tap, the positive pole of second current generating unit connects direct supply, and the control end of described the 3rd gauge tap is imported described control signal;
Described setting circuit connects first end of described the 3rd gauge tap, and control end connects described control signal, is used for controlling the current potential that improves this first end when this setting circuit is opened in described control signal;
Described decision circuit one end connects first end of described the 3rd gauge tap, the other end connects the control end of described second gauge tap, the duty that is used for described second gauge tap of control, and this other end is exported corresponding signal as the output terminal of this over-voltage detection circuit, control end is imported described control signal, this decision circuit is used for when detecting input voltage sampled signal that described voltage sampling circuit collects greater than preset value, produce low level signal, and control described second gauge tap disconnection.
Preferably, described voltage sampling circuit comprises: first divider resistance and second divider resistance, one end of described first divider resistance is imported described input voltage as the input end of this voltage sampling circuit, the other end links to each other with an end of described second divider resistance, and this other end is as the output terminal of this voltage sampling circuit, and the other end of described second divider resistance connects earth terminal.
Preferably, described setting circuit comprises: first switching tube, and first end of this first switching tube connects first end of described the 3rd gauge tap, and second end connects described direct supply, and control end is imported described control signal.
Preferably, described decision circuit comprises: first phase inverter, first rejection gate, second rejection gate and second phase inverter, wherein,
The input end of described first phase inverter connects first end of described the 3rd gauge tap, and output terminal connects the first input end of described first rejection gate;
The output terminal of described first rejection gate connects the first input end of described second rejection gate, and output terminal connects the input end of described second phase inverter, and this output terminal connects second input end of described first rejection gate; Second input end of described second rejection gate is imported described control signal as the control end of this decision circuit;
The output terminal of described second phase inverter connects the control end of described second gauge tap.
Preferably, the described first voltage controlled current generation unit is: the second switch pipe, and first end connects earth terminal, and second end connects first end of described second gauge tap, and control end connects second end of described first gauge tap.
Preferably, described second current generating unit is: the 3rd switching tube, and first end of described the 3rd switching tube connects second end of described the 3rd gauge tap, and second end of described the 3rd switching tube connects described direct supply, and control end connects described direct supply.
Preferably, described first gauge tap is: the 4th switching tube, and first end connects the output terminal of described voltage sampling circuit, and second end connects the control end of the described first voltage controlled current generation unit, and control end is imported described control signal.
Preferably, described second gauge tap is: the 5th switching tube, and first end connects the positive pole of the described first voltage controlled current generation unit, and second end connects first end of described the 3rd gauge tap, and control end connects the output terminal of described decision circuit.
Preferably, described the 3rd gauge tap comprises: the 3rd phase inverter and the 6th switching tube, wherein,
First end of described the 6th switching tube connects second end of described second gauge tap, second end connects the negative pole of described second current generating unit, control end links to each other with the output terminal of described the 3rd phase inverter, and the input end of described the 3rd phase inverter is imported described control signal.
Preferably, described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube or the 5th switching tube are N-type metal semiconductor field effect transis metal-oxide-semiconductor, and first end is that source electrode, second end are grid for drain electrode, control end;
Described the 6th switching tube is P type metal-oxide-semiconductor, and described first end is that source electrode, second end are grid for drain electrode, control end.The technical scheme that is provided by above the embodiment of the present application as seen, when described over-voltage detection circuit detects input voltage and is higher than predeterminated voltage, the low level signal of output is controlled described second gauge tap and is disconnected, make this over-voltage detection circuit no longer detect input voltage signal, thereby avoided this over-voltage detection circuit of input of noise signal, and then strengthened the noise robustness of over-voltage detection circuit, simultaneously, reduced the power consumption of this over-voltage detection circuit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of over-voltage detection circuit of the embodiment of the present application;
Fig. 2 is the particular circuit configurations synoptic diagram of a kind of over-voltage detection circuit of the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand technical scheme among the application better, 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 only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
See also Fig. 1, show a kind of structural representation of over-voltage detection circuit, mainly comprise: voltage sampling circuit 100, setting circuit 200, decision circuit 300, the first gauge tap S1, the second gauge tap S2, the 3rd gauge tap S3, the first voltage controlled current generation unit I1 and the second current generating unit I2.
The input of the input end of described voltage sampling circuit 100 has input voltage vin, and output terminal connects the control end of the described first voltage controlled current generation unit I1 by first gauge tap, wherein,
First end of the first gauge tap S1 connects the output terminal of described voltage sampling circuit, and second end connects the control end of the described first voltage controlled current generation unit, the control end input control signal C1 of first gauge tap.
The positive pole of the described first voltage controlled current generation unit I1 connects first end of the described second gauge tap S2, negative pole connects earth terminal, second end of the described second gauge tap S2 connects first end of described the 3rd gauge tap S3, and control end connects the output terminal of described decision circuit 300.
Second end of described the 3rd gauge tap S3 connects the negative pole of the described second current generating unit I2, and the positive pole of the second current generating unit S2 connects direct supply VDD, and the control end of described the 3rd gauge tap S3 is imported described control signal C1.
Described setting circuit 200 connects first end of described the 3rd gauge tap S3, and control end is imported described control signal C1, when control signal is controlled these setting circuit 200 work, first end of described the 3rd gauge tap S3 is set to noble potential.
The input end of described decision circuit 300 connects first end of described the 3rd gauge tap S3, and output terminal is as the output terminal of this over-voltage detection circuit, and control end is imported described control signal C1.Simultaneously, the output terminal of described decision circuit connects the control end of the described second gauge tap S2, is used for the duty of described second gauge tap of control.
Concrete, the course of work of this over-voltage detection circuit is as follows:
When input voltage vin is detected, control signal C1 controls the described first gauge tap S1, the 3rd gauge tap S3 and opens, and the current potential of first end of the 3rd gauge tap S3 is high level, after handling by decision circuit, the output high level is controlled the second gauge tap S2 and is opened, and this over-voltage detection circuit enters the voltage detecting state.At this moment, the sampled signal of the input voltage vin that voltage sampling circuit 100 collects is passed to the first voltage controlled current generation unit by the first gauge tap S1, thereby control the size of the electric current of first voltage controlled current generation unit I1 output, when electric current that the electric current of this first voltage controlled current generation unit I1 output produces greater than the described second current generating unit I2, be that the numerical value of detected input voltage is during greater than the numerical value of predeterminated voltage, because the negative pole of the first voltage controlled current generation unit I1 connects earth terminal, so the current potential of first end of the 3rd gauge tap S3 is dragged down, make decision circuit 300 output low levels, simultaneously, controlling the described second gauge tap S2 disconnects, at this moment, noise signal can't enter described decision circuit, therefore, the output terminal of this over-voltage detection circuit can not produce noise signal, and then, reduced the power consumption of over-voltage detection circuit.
When electric current that the electric current of first voltage controlled current generation unit I1 output produces less than the described second current generating unit I2, the current potential of the 3rd gauge tap S3 first end is high level, after handling through decision circuit, and output terminal output high level.
See also Fig. 2, show a kind of concrete electrical block diagram of over-voltage detection circuit.
Described voltage sampling circuit 100 comprises: the first divider resistance R1 and the second divider resistance R2, the end input of the described first divider resistance R1 has described input voltage vin, the other end connects the described second divider resistance R2, simultaneously, this other end connects first end of the first gauge tap S1 as the output terminal of this voltage sampling circuit; The other end of the second divider resistance R2 connects earth terminal.
Described setting circuit 200 is the first switching tube M1, and first end of this first switching tube M1 connects first end of described the 3rd gauge tap S3, and second end of the first switching tube M1 connects described direct supply VDD, and the control end input has control signal C1.
The input end of the first phase inverter I3 connects first end of described the 3rd gauge tap S3, output terminal connects the first input end of the first rejection gate I4, the output terminal of the first rejection gate I4 connects the first input end of the described second rejection gate I5, second input end input of the second rejection gate I5 has control signal C1, the output terminal of second rejection gate connects the input end of the described second phase inverter I6, simultaneously, this output terminal connects second input end of the first rejection gate I4, and the output terminal of the second phase inverter I6 is the output terminal of this over-voltage detection circuit.
The first voltage controlled current generation unit I1 is second switch pipe M2, and its first end connects earth terminal, and second end connects first end of described second gauge tap, and control end connects second end of described first gauge tap.
The described second current generating unit I2 is the 3rd switching tube M3, and its first end connects second end of described the 3rd gauge tap, and second end of the 3rd switching tube M3 connects described direct supply VDD, and control end connects described direct supply VDD.And the electric current that this second current generating unit I2 produces is relevant with described predeterminated voltage, by changing the numerical value that electric current that the second current generating unit I2 produces changes the predeterminated voltage of this over-voltage detection circuit.
The described first gauge tap S1 is the 4th switching tube M4, and first end of the 4th switching tube, second end, control end are respectively first end, second end, the control end of the described first gauge tap S1.
The described second gauge tap S2 is the 5th switching tube M5, and first end of the 5th switching tube, second end, control end are respectively first end, second end, the control end of the described second gauge tap S2.
Described the 3rd gauge tap S3 comprises the 3rd phase inverter I7 and the 6th switching tube M6, described control signal carries out offering after anti-phase the control end of the 6th switching tube M6 through described the 3rd phase inverter I7, and first end of the 6th switching tube, second end are respectively first end, second end of described the 3rd gauge tap S3.
Preferably, described the first, second, third, fourth, the 5th switching tube is the NMOS pipe, and first end is that source electrode, second end are grid for drain electrode, control end; Described the 6th switching tube is the PMOS pipe, and first end is that source electrode, second end are grid for drain electrode, control end.
The course of work of this over-voltage detection circuit is as follows:
When control signal C1 is the low level voltage signal, the first switching tube M1 ends, become the high level voltage signal after control signal C1 is anti-phase through the 3rd phase inverter I7, thereby drive the 6th switching tube M6 conducting, because the 3rd switching tube is connected with direct supply VDD, so first end of the 6th switching tube M6, namely the c point is pulled to high level among the figure, anti-phase through the first phase inverter I3 after, the p point is low level, because the current potential of each point is low level when initial, therefore, the output terminal q point of the first rejection gate I4 is high level, second or the output terminal r point of non-I5 be low level, the output terminal s point of the second phase inverter I6 is high level, and at this moment, the 5th switching tube M5 opens;
After the 5th switching tube M5 opens, the sampled voltage signal of input voltage vin transfers to the control end of second switch pipe M2 by the 4th switching tube M4, control second switch pipe M2 opens, along with the electric current on the second switch pipe M2 increases, when the electric current on the second switch pipe M2 surpasses electric current on the 3rd switching tube M3, the current potential that c is ordered is pulled low to low level rapidly, thereby making the p point is high level, the q point is low level, again because control signal C1 is high level, therefore the r point is high level, so the s point is low level, thereby the 5th switching tube M5 is ended.At this moment, noise signal can't enter described decision circuit, and therefore, the output terminal of this over-voltage detection circuit can not produce noise signal, and then, reduced the power consumption of over-voltage detection circuit.
If control signal C1 is high level signal, the 4th switching tube M4 ends, and at this moment, can't detect the state of input voltage vin.Simultaneously, the 6th switching tube M6 ends, the first switching tube M1 conducting, and the current potential that c is ordered is set to high level, and finally making the s point is high level, and namely over-voltage detection circuit is exported high level when not detecting the state of input voltage Vn.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses is difference with other embodiment.
Need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.
The above only is the application's embodiment; 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 domain.
Claims (9)
1. an over-voltage detection circuit is characterized in that, comprising: voltage sampling circuit, setting circuit, decision circuit, first gauge tap, second gauge tap, the 3rd gauge tap, the first voltage controlled current generation unit and second current generating unit,
The input end input of described voltage sampling circuit has input voltage, output terminal to connect first end of described first gauge tap, is used for obtaining the input voltage sampled signal;
Second end of described first gauge tap connects the control end of the described first voltage controlled current generation unit, the control end input control signal of first gauge tap;
The positive pole of the described first voltage controlled current generation unit connects first end of described second gauge tap, and negative pole connects earth terminal;
Second end of described second gauge tap connects the negative pole of described second current generating unit by described the 3rd gauge tap, wherein, second end of described the 3rd gauge tap connects the negative pole of described second current generating unit, first end connects second end of described second gauge tap, the positive pole of second current generating unit connects direct supply, and the control end of described the 3rd gauge tap is imported described control signal;
Described setting circuit connects first end of described the 3rd gauge tap, and control end connects described control signal, is used for controlling the current potential that improves this first end when this setting circuit is opened in described control signal;
Described decision circuit one end connects first end of described the 3rd gauge tap, the other end connects the control end of described second gauge tap, the duty that is used for described second gauge tap of control, and this other end is exported corresponding signal as the output terminal of this over-voltage detection circuit, control end is imported described control signal, this decision circuit is used for when detecting input voltage sampled signal that described voltage sampling circuit collects greater than preset value, produce low level signal, and control described second gauge tap disconnection.
2. over-voltage detection circuit according to claim 1, it is characterized in that, described voltage sampling circuit comprises: first divider resistance and second divider resistance, one end of described first divider resistance is imported described input voltage as the input end of this voltage sampling circuit, the other end links to each other with an end of described second divider resistance, and this other end is as the output terminal of this voltage sampling circuit, and the other end of described second divider resistance connects earth terminal.
3. over-voltage detection circuit according to claim 2, it is characterized in that described setting circuit comprises: first switching tube, first end of this first switching tube connects first end of described the 3rd gauge tap, second end connects described direct supply, and control end is imported described control signal.
4. over-voltage detection circuit according to claim 3 is characterized in that, described decision circuit comprises: first phase inverter, first rejection gate, second rejection gate and second phase inverter, wherein,
The input end of described first phase inverter connects first end of described the 3rd gauge tap, and output terminal connects the first input end of described first rejection gate;
The output terminal of described first rejection gate connects the first input end of described second rejection gate, and the output terminal of described second rejection gate connects the input end of described second phase inverter, and this output terminal connects second input end of described first rejection gate; Second input end of described second rejection gate is imported described control signal as the control end of this decision circuit;
The output terminal of described second phase inverter connects the control end of described second gauge tap.
5. over-voltage detection circuit according to claim 1, it is characterized in that the described first voltage controlled current generation unit is: the second switch pipe, first end connects earth terminal, second end connects first end of described second gauge tap, and control end connects second end of described first gauge tap.
6. over-voltage detection circuit according to claim 1, it is characterized in that, described second current generating unit is: the 3rd switching tube, first end of described the 3rd switching tube connects second end of described the 3rd gauge tap, second end of described the 3rd switching tube connects described direct supply, and control end connects described direct supply.
7. over-voltage detection circuit according to claim 1, it is characterized in that described first gauge tap is: the 4th switching tube, first end connects the output terminal of described voltage sampling circuit, second end connects the control end of the described first voltage controlled current generation unit, and control end is imported described control signal.
8. over-voltage detection circuit according to claim 1, it is characterized in that, described second gauge tap is: the 5th switching tube, first end connects the positive pole of the described first voltage controlled current generation unit, second end connects first end of described the 3rd gauge tap, and control end connects the output terminal of described decision circuit.
9. over-voltage detection circuit according to claim 1 is characterized in that, described the 3rd gauge tap comprises: the 3rd phase inverter and the 6th switching tube, wherein,
First end of described the 6th switching tube connects second end of described second gauge tap, second end connects the negative pole of described second current generating unit, control end links to each other with the output terminal of described the 3rd phase inverter, and the input end of described the 3rd phase inverter is imported described control signal.
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| CN 201110391552 CN102435820B (en) | 2011-11-30 | 2011-11-30 | Overvoltage detection circuit |
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| CN 201110391552 CN102435820B (en) | 2011-11-30 | 2011-11-30 | Overvoltage detection circuit |
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| CN102435820B true CN102435820B (en) | 2013-08-07 |
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| US6127879A (en) * | 1998-02-26 | 2000-10-03 | Lockheed Martin Corporation | Multi-channel overvoltage protection circuit |
| CN2842837Y (en) * | 2005-11-22 | 2006-11-29 | 深圳市核达中远通电源技术有限公司 | Switch powersupply parallel operation system and its output overvoltage protective circuit |
| JP2007329998A (en) * | 2006-06-06 | 2007-12-20 | Ricoh Co Ltd | Overvoltage protection circuit, overvoltage protection method of overvoltage protection circuit, and semiconductor device having overvoltage protection circuit |
| CN101868105B (en) * | 2010-05-28 | 2013-12-11 | 浙江大邦科技有限公司 | Electronic ballast and overvoltage protection method thereof |
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Effective date of registration: 20210416 Address after: 243000 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, economic and Technological Development Zone, Ma'anshan City, Anhui Province Patentee after: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. Address before: 100029 Beijing city Chaoyang District Beitucheng West Road No. 3 Patentee before: Institute of Microelectronics, Chinese Academy of Sciences |
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Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |