CN103066574A - Over-voltage protection (OVP) protection line of multiple groups of voltage - Google Patents
Over-voltage protection (OVP) protection line of multiple groups of voltage Download PDFInfo
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- CN103066574A CN103066574A CN2012105469878A CN201210546987A CN103066574A CN 103066574 A CN103066574 A CN 103066574A CN 2012105469878 A CN2012105469878 A CN 2012105469878A CN 201210546987 A CN201210546987 A CN 201210546987A CN 103066574 A CN103066574 A CN 103066574A
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Abstract
The invention provides an over-voltage protection (OVP) protection line of multiple groups of voltage. The OVP protection line of the multiple groups of voltage comprises a multivoltage sampling circuit, a voltage detecting circuit and a delayed self-locking protection circuit, wherein the multivoltage sampling circuit, the voltage detecting circuit and the delayed self-locking protection circuit are connected in series in sequence. The multivoltage sampling circuit is used for inputting the highest voltage of multiple groups of voltage into the voltage detecting circuit. The voltage detecting circuit judges whether the received voltage exceeds critical voltage. When the actual voltage exceeds the critical voltage, the delayed self-locking protection circuit is triggered. When the delayed self-locking protection circuit is triggered, a whole system is powered off, and the whole line is in a protection state. Compared with the prior art, the OVP protection line of the multiple groups of voltage can detect multiple groups of voltage, and meanwhile has delayed and self-locking functions, and can effectively save cost.
Description
Technical field
The present invention relates to many group voltage overload resist technologies field, specifically a kind of OVP protection circuit of many group voltages.
Background technology
Now people's life has be unable to do without electronic product; and the fail safe of electronic product and people's life is also closely bound up; the research staff will consider when hardware breaks down when design; how to realize self-protection; protecting on the one hand whole circuit to be without prejudice can be from recovery when fixing a breakdown, and the opposing party protects end user's safety.Some famous brand products also propose higher requirement: smokeless without fiery free from extraneous odour.So protection circuit is very important in hardware designs, voltage protection is a protection circuit part, and special-purpose protection chip is generally adopted in now main flow voltage protection, and cost and design flexibility and recoverability are had a lot of drawbacks.Thereby, needing now a kind of low cost, the multichannel detecting is easily regulated, and certainly recovers the protection circuit of lockout.
Summary of the invention
Technical assignment of the present invention is to solve the deficiencies in the prior art, and a kind of low cost is provided, and the multichannel detecting is easily regulated, self-healing many group voltage OVP protection circuits.
Technical scheme of the present invention realizes that in the following manner the OVP protection circuit of these a kind of many group voltages comprises multivoltage sample circuit, voltage detection circuit and time-delay self-locking protective circuit that order is connected, wherein
The multivoltage sample circuit is responsible for being input to voltage detection circuit with organizing voltage the highest in the voltage more;
Voltage detection circuit judges whether the voltage that receives surpasses critical voltage, when virtual voltage surpasses critical voltage, and the Time delay self-locking protective circuit;
When the time-delay self-locking protective circuit touches, the whole system outage, whole circuit is in guard mode.
Described multivoltage sample circuit comprises some component volt circuits parallel with one another; the concrete structure of described every component volt circuit is: be connected with divider resistance at voltage input end; the output of this divider resistance connects the positive pole of diode and the input of another protective resistance; the negative pole of described diode connects voltage detection circuit, the output head grounding of another protective resistance.
Multivoltage sample circuit in technique scheme utilizes the electric resistance partial pressure voltage that high voltage transitions one-tenth is lower (if voltage is original just enough low, then without the divider resistance dividing potential drop, be directly connected to diode), and then utilize the one-way conduction characteristic of diode, will make voltage high pass through the VDD pin that diode arrives detecting voltage IC chip in the following technical proposals, so as long as one tunnel overtension will cause the VDD pin voltage of detecting voltage IC chip of diode rear end too high.
Described voltage detection circuit comprises detecting voltage IC chip, a metal-oxide-semiconductor, the input of described detecting voltage IC chip connects the voltage of multivoltage sample circuit output, the output of this chip connects the grid of metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, drain electrode connect delay self-lock circuit, the output of said chip also connects 5VAUX and ground by two resistance respectively, and described 5VAUX refers to normal 5V power supply.
Voltage by diode in the technique scheme is input to detecting voltage IC chip, and the function of this chip is when the voltage of input pin is lower than 2.5V, and output pin can be dragged down; When the voltage of input pin is higher than 2.5V, its output pin will be set to high impedance.In case so any one overtension of front and make the voltage of diode back surpass 2.5V, the output pin of chip will be set to high impedance, the metal-oxide-semiconductor in the voltage detection circuit will conducting.
Described delay self-lock circuit comprises reverse delayer U8A, U8C, the U8B of three order series connection, the voltage of voltage detection circuit output connects U8A and input U8B, U8A, U8C, U8B all are connected with power supply VBT by same resistance, the output of U8B connects the grid of a metal-oxide-semiconductor, and the source ground of this metal-oxide-semiconductor, drain electrode connect the electric power starting end.
After the metal-oxide-semiconductor conducting in the voltage detection circuit, the meeting of U8A input is low level, through U8A, U8B exports high level behind three reverse delayers of U8C, and opens the metal-oxide-semiconductor in this circuit, and the electric power starting end signal dragged down, making system cut-off, whole system can't be started shooting.And then finish OVP point trigger protection, and lock it in guard mode.
Metal-oxide-semiconductor in above-mentioned voltage detection circuit and the voltage detection circuit is the N-channel MOS pipe.
The beneficial effect that the present invention compared with prior art produces is:
The OVP protection circuit of a kind of many group voltages of the present invention can be organized detecting voltage more; have simultaneously time-delay and auto-lock function: its plurality of voltages detecting function can be saved cost; time-delay can allow circuit can not disturbed by the niose in the external world and cause misoperation; when occuring whole system can be locked behind the OVP; improve the fail safe when breaking down; thereby the present invention is easy to promote the use of.
Description of drawings
Accompanying drawing 1 is overall structure schematic block diagram of the present invention.
Multivoltage sample circuit figure of the present invention during accompanying drawing 2.
Accompanying drawing 3 is voltage detection circuit figure of the present invention.
Accompanying drawing 4 is delay self-lock circuit figure of the present invention.
Embodiment
Be described in detail below below in conjunction with the OVP protection circuit of accompanying drawing to a kind of many group voltages of the present invention.
As shown in Figure 1, the OVP protection circuit of these a kind of many group voltages comprises multivoltage sample circuit, voltage detection circuit and time-delay self-locking protective circuit that order is connected, wherein
The multivoltage sample circuit is responsible for being input to voltage detection circuit with organizing voltage the highest in the voltage more;
Voltage detection circuit judges whether the voltage that receives surpasses critical voltage, and described critical voltage refers to 2.5V, when virtual voltage surpasses critical voltage, and the Time delay self-locking protective circuit;
When the time-delay self-locking protective circuit touches, the whole system outage, whole circuit is in guard mode.
As shown in Figure 2; described multivoltage sample circuit comprises N component volt circuit parallel with one another; suppose that the 1st～(N-1) group voltage is high voltage; N group voltage is low-voltage; (N-1) group voltage utilizes resistance to carry out dividing potential drop then; its concrete dividing potential drop mode is: every group of voltage input end is connected with divider resistance, and the output of this divider resistance connects the positive pole of diode and the input of another protective resistance, the output head grounding of this another protective resistance.N group voltage then is directly connected to diode, the negative pole access voltage detection circuit of described 1～N group diode.
As shown in Figure 3, described voltage detection circuit comprises detecting voltage IC chip, N-channel MOS pipe Q10, the model of this detecting voltage IC chip is: S-80925CNMC-G8V-T2G, 1～5 pin of described detecting voltage IC chip is respectively output pin, the access pin, ground pin, blank pipe pin and CD pin, wherein the 2nd pin connects the voltage of multivoltage sample circuit input, the 1st pin connects the grid of Q10, the source ground of Q10, drain electrode connects delay self-lock circuit, above-mentioned the 1st pin is also by resistance R 13, R12 connects respectively 5VAUX and ground, and described 5VAUX refers to normal 5V power supply.
As shown in Figure 4, described delay self-lock circuit comprises reverse delayer U8A, U8C, the U8B of three order series connection, the voltage of voltage detection circuit output connects U8A and input U8B, the ∞ pin of U8A, U8C, U8B all is connected with power supply VBT by resistance R 7, the output of U8B connects the grid of a N-channel MOS pipe Q18, and the source ground of Q18, drain electrode meet Power_ON.
After the Q10 conducting, the Pin1 of U8A input will be low level, through U8A, U8B, and an output high level behind three reverse delayers of U8C, and open MOS Q18, and signal is dragged down, make system cut-off (the 1st～N group voltage and 5VAUX will not have electricity this moment).The 5PIN of the PIN of U8A and U8B links to each other in addition, the 1st pin and U8B the 5th pin of U8A can be locked in low level state, and then the output Pin2 of U8B is locked in high level, at last Q18 is locked in conducting state.Then Power_on will drag down always.As long as VBT exists, Power_on is just dragged down always like this, and whole system just can't be started shooting.
The method that unlocks is exactly that the power supply of VBT is restarted, just the grid of Q18 can be returned to low level, and it is normal that circuit recovers.
Claims (5)
1. the OVP protection circuit of the voltage of group more than a kind is characterized in that: comprise multivoltage sample circuit, voltage detection circuit and the time-delay self-locking protective circuit of order series connection, wherein
The multivoltage sample circuit is responsible for being input to voltage detection circuit with organizing voltage the highest in the voltage more;
Voltage detection circuit judges whether the voltage that receives surpasses critical voltage, when virtual voltage surpasses critical voltage, and the Time delay self-locking protective circuit;
When the time-delay self-locking protective circuit touches, the whole system outage, whole circuit is in guard mode.
2. the OVP protection circuits of a kind of many group voltages according to claim 1; it is characterized in that: described multivoltage sample circuit comprises some component volt circuits parallel with one another; the concrete structure of described every component volt circuit is: be connected with divider resistance at voltage input end; the output of this divider resistance connects the positive pole of diode and the input of another protective resistance; the negative pole of described diode connects voltage detection circuit, the output head grounding of another protective resistance.
3. the OVP protection circuits of a kind of many group voltages according to claim 1 and 2; it is characterized in that: described voltage detection circuit comprises detecting voltage IC chip, a metal-oxide-semiconductor; the input of described detecting voltage IC chip connects the voltage of multivoltage sample circuit output; the output of this chip connects the grid of metal-oxide-semiconductor; the source ground of described metal-oxide-semiconductor, drain electrode connect delay self-lock circuit; the output of said chip also connects 5VAUX and ground by two resistance respectively, and this 5VAUX refers to normal 5V power supply.
4. the OVP protection circuits of a kind of many group voltages according to claim 3; it is characterized in that: described delay self-lock circuit comprises reverse delayer U8A, U8C, the U8B of three order series connection; the voltage of voltage detection circuit output connects U8A and input U8B; U8A, U8C, U8B all are connected with power supply VBT by same resistance; the output of U8B connects the grid of a metal-oxide-semiconductor, and the source ground of this metal-oxide-semiconductor, drain electrode connect the electric power starting end.
5. the OVP protection circuits of a kind of many group voltages according to claim 4, it is characterized in that: the metal-oxide-semiconductor in above-mentioned voltage detection circuit and the voltage detection circuit is the N-channel MOS pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105469878A CN103066574A (en) | 2012-12-17 | 2012-12-17 | Over-voltage protection (OVP) protection line of multiple groups of voltage |
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| CN2012105469878A CN103066574A (en) | 2012-12-17 | 2012-12-17 | Over-voltage protection (OVP) protection line of multiple groups of voltage |
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| CN2012105469878A Pending CN103066574A (en) | 2012-12-17 | 2012-12-17 | Over-voltage protection (OVP) protection line of multiple groups of voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9466974B2 (en) | 2014-04-30 | 2016-10-11 | Dell Products L.P. | Systems and methods for inductive overvoltage protection of PFC bulk capacitors in power supplies |
| CN107179433A (en) * | 2017-06-07 | 2017-09-19 | 上海乐野网络科技有限公司 | A kind of electric voltage observation circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CH620795A5 (en) * | 1976-09-22 | 1980-12-15 | Aeg Telefunken Oesterr | Network protection device having a power circuit breaker which switches on again automatically in high-voltage overhead lines which have been disturbed, in very high-voltage networks whose star point is earthed |
| CN1472863A (en) * | 2002-08-02 | 2004-02-04 | 华为技术有限公司 | Single-deck power supply backup method and backup system |
| CN101119021A (en) * | 2006-05-10 | 2008-02-06 | 三星电子株式会社 | Over voltage protection circuit and method thereof |
| CN101447666A (en) * | 2007-11-27 | 2009-06-03 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and power overvoltage safety protection control method |
| CN201466667U (en) * | 2009-07-31 | 2010-05-12 | 北京七星华创电子股份有限公司 | Protective device of direct current (DC) power supply and load |
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2012
- 2012-12-17 CN CN2012105469878A patent/CN103066574A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH620795A5 (en) * | 1976-09-22 | 1980-12-15 | Aeg Telefunken Oesterr | Network protection device having a power circuit breaker which switches on again automatically in high-voltage overhead lines which have been disturbed, in very high-voltage networks whose star point is earthed |
| CN1472863A (en) * | 2002-08-02 | 2004-02-04 | 华为技术有限公司 | Single-deck power supply backup method and backup system |
| CN101119021A (en) * | 2006-05-10 | 2008-02-06 | 三星电子株式会社 | Over voltage protection circuit and method thereof |
| CN101447666A (en) * | 2007-11-27 | 2009-06-03 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and power overvoltage safety protection control method |
| CN201466667U (en) * | 2009-07-31 | 2010-05-12 | 北京七星华创电子股份有限公司 | Protective device of direct current (DC) power supply and load |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9466974B2 (en) | 2014-04-30 | 2016-10-11 | Dell Products L.P. | Systems and methods for inductive overvoltage protection of PFC bulk capacitors in power supplies |
| CN107179433A (en) * | 2017-06-07 | 2017-09-19 | 上海乐野网络科技有限公司 | A kind of electric voltage observation circuit |
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Application publication date: 20130424 |