CN103994862A - Leakage detecting circuit - Google Patents
Leakage detecting circuit Download PDFInfo
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- CN103994862A CN103994862A CN201410245797.1A CN201410245797A CN103994862A CN 103994862 A CN103994862 A CN 103994862A CN 201410245797 A CN201410245797 A CN 201410245797A CN 103994862 A CN103994862 A CN 103994862A
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- comparer
- leak detection
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Abstract
The invention provides a leakage detecting circuit which is characterized in that a humidity signal collecting unit, a comparer and a switch element are included, the humidity signal collecting unit is used for collecting humidity signals, the output voltage of the humidity signal collecting unit changes according to humidity, a first input end of the comparer is connected with reference voltage, a second input end of the comparer is connected with the output end of the humidity signal collecting unit, the output end of the comparer drives the switch element to be in a connected state, and leakage is judged according to state changing of the switch element. The corresponding voltages at the two ends of a hygristor are used as input of one end of the comparer, when the output end of the comparer outputs voltage, the switch element is driven to be in a connected state, then leakage is judged, and system safety and reliability are improved.
Description
Technical field
The present invention relates to electric vehicle engineering field, relate in particular to a kind of leak detection circuit.
Background technology
In order to reduce the dependence to traditional energy, the research of the actively developing new forms of energy problem that becomes international.At automotive field, to the development of electric automobile and exploitation, be enjoying popular confidence of electric vehicle industrialization.
For electric automobile, utilize accumulator that power is provided, accumulator need to charge frequently and discharge, while there is drainage in battery pack, can cause car load insulation resistance to reduce, there is short circuit in battery cell, even can have influence on driver and crew's life security.Therefore, whether the sealing of battery pack and insulativity be good, all most important for normal work and the safety of car load.
For this reason, be necessary to propose a kind of leak detection circuit of accumulator of electric automobile, to guarantee the security of car load.
Summary of the invention
Based on the problems referred to above, the invention provides a kind of leak detection circuit, realized the leak detection of the accumulator of electric automobile.
In order to achieve the above object, the invention provides following technical scheme:
A leak detection circuit, comprising: moisture signal collecting unit, comparer and on-off element;
Infiltration signal gathering unit, for gathering moisture signal, its output voltage changes with humidity;
Comparer, its first input end connects reference voltage, the output terminal of its second input termination moisture signal collecting unit;
The output terminal driving switch element of comparer, in conducting state, is judged the generation of infiltration by the state variation of on-off element.
Preferably, described on-off element is field effect transistor, and the output terminal of comparer is connected to the control end of field effect transistor.
Preferably, also comprise d type flip flop, the current output terminal of on-off element is connected to the preset end PR of d type flip flop, is embodied the state variation of on-off element by the state variation of the output terminal of d type flip flop.
Preferably, the current output terminal of on-off element be connected to pull-up resistor.
Preferably, the reset terminal of described d type flip flop is defaulted as high level, is low level during reset operation.
Also comprise clamping circuit, be attempted by the second input end input voltage two ends.
Preferably, described moisture signal collecting unit comprises humidity sensitive resistance, and the voltage of the second input end is with the change in voltage at humidity sensitive resistance two ends.
The leak detection circuit that the embodiment of the present invention provides, by the input of device one end as a comparison of the corresponding voltage in hygristor two ends, when comparator output terminal output voltage, driving switch element is in conducting state, and then, the generation of judgement seepage, the safety and reliability of raising system.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of the leak detection circuit of the embodiment of the present invention.
Embodiment
For above-mentioned purpose, the feature and advantage of invention can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
A lot of details have been set forth in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here and implement, those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that, so the present invention is not subject to the restriction of following public specific embodiment.
In the solution of the present invention, a kind of hardware implementations of leak detection has been proposed, in this circuit, shown in figure 1, comprising: moisture signal collecting unit, comparer UC1 and on-off element QC1;
Temperature signal collection unit, for gathering moisture signal, its output voltage changes with humidity;
Comparer UC1, its first input end meets reference voltage V1, the output terminal of its second input termination moisture signal collecting unit;
The output terminal output driving switch element QC1 of comparer, in conducting state, is judged the generation of infiltration by the state variation of on-off element.
In the present invention, by the voltage signal changing with the humidity input of device one end as a comparison, when comparator output terminal output voltage, driving switch element is in conducting state, and then the generation of judgement seepage, improves the safety and reliability of system
For a better understanding of the present invention, below will be described in detail with specific embodiment.
In the present embodiment, as shown in Figure 1, moisture signal collecting unit adopts the bleeder circuit that comprises humidity sensitive resistance 100, this humidity collection unit comprises from the first resistance R C2 and the humidity sensitive resistance R B1 of power supply VCC serial connection, humidity sensitive resistance R B1 other end ground connection, comparer UC1 the second input end 3 is connected between the first resistance R C2 and humidity sensitive resistance R B1, with the voltage V2 at the humidity sensitive resistance R B1 two ends input voltage signal of device UC1 the second input end as a comparison; The first input end 1 of comparer UC1 meets reference voltage V1, and this V1 is provided by divider resistance circuit 300, in a specific embodiment, by the 3rd resistance R C3, the 4th resistance R C6, the dividing potential drop of power supply VCC is obtained.Clamping diode circuit 200 is gone back and be connected to the second input end 3 at comparer.In the present embodiment, the positive input that first input end is comparer, the reverse input end that the second input end is comparer.
The output terminal 4 of comparer UC1 is connected to the control end 3 of field effect transistor QC1, in the present embodiment, this field effect transistor is n type field effect transistor, at the drain electrode end 1 of this n type field effect transistor QC1, connect voltage and draw high resistance circuit 400, in specific embodiment, connecting resistance RC3 and power supply VCC successively, source terminal 2 ground connection of n type field effect transistor QC1.
From the drain electrode end 1 of field effect transistor QC1, be connected to the preset end PR of d type flip flop UC1A, the D end of d type flip flop and CLK end ground connection or unsettled, the reset terminal CLR of d type flip flop connects reset circuit 500, by its output terminal
output carry out the judgement of seepage.The power supply of d type flip flop is provided by power circuit 600.
Reference voltage V1 sets a reference voltage according to concrete circuit conditions, in this embodiment, when not having seepage to occur, the resistance value of humidity sensitive resistance is larger, and the voltage of the negative input end of comparer is larger, like this, comparer does not have Voltage-output, now, and not conducting of field effect transistor QC1, the voltage of the drain electrode end 1 of n type field effect transistor QC1 is high voltage, and the set end PR at d type flip flop obtains a high level.
And when having seepage to occur, the resistance value of humidity sensitive resistance diminishes, it is the voltage decreases of the negative input end of comparer, when it is less than reference voltage V1, comparer has Voltage-output, this output voltage makes field effect transistor QC1 in conducting state, and the voltage transition that makes the drain electrode end 1 of n type field effect transistor QC1 is low-voltage, and the set end PR at d type flip flop changes low level into by high level.
The truth table of table 1D trigger
As table 1, in these cases, at the reset terminal CLR of d type flip flop, be high level, PR end during for high level, output terminal Q will follow the pin state of PR, and when there is seepage, PR port becomes low level from high level, and Q is high level by low level upset immediately,
for being high level by low level upset, this process realized circuit by normal operating conditions to the change procedure detecting after malfunction, when there is seepage fault, d type flip flop pass through Q and
form with low and high level latchs seepage malfunction.
When the reseting port CLR of d type flip flop is high level, port PR is high level, and Q is low level,
during for high level; Add a low level to reseting port CLR, Q and
level state overturn separately, thereby the system that returns to is corresponding, do not have out of order state, this process is reseting procedure, can be by inputting a lasting low level at reseting port place by CLEAR FLT port, by the effect that discharges and recharges of capacitor C C3, at reseting port CLR, obtain one and continue low level signal, thereby complete the reset of d type flip flop state.The power supply of d type flip flop is provided by feed circuit.
In the present embodiment, reset circuit 500 comprises successively along the earth terminal, the first diode, the second diode, power supply, the resistance R C7 that connect, the output terminal of resistance R C7 is connected with the end points between the first diode, the second diode, and from this end points, be connected to the reseting port CLR of d type flip flop, this end points place is connected with capacitor C C3, this electric capacity has input port CLEAR FLT, completes the homing action of d type flip flop to input a lasting low level.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.
Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (7)
1. a leak detection circuit, is characterized in that, comprising: moisture signal collecting unit, comparer and on-off element;
Infiltration signal gathering unit, for gathering moisture signal, its output voltage changes with humidity;
Comparer, its first input end connects reference voltage, the output terminal of its second input termination moisture signal collecting unit;
The output terminal driving switch element of comparer, in conducting state, is judged the generation of infiltration by the state variation of on-off element.
2. leak detection circuit according to claim 1, is characterized in that, described on-off element is field effect transistor, and the output terminal of comparer is connected to the control end of field effect transistor.
3. leak detection circuit according to claim 1, is characterized in that, also comprises d type flip flop, and the current output terminal of on-off element is connected to the preset end PR of d type flip flop, is embodied the state variation of on-off element by the state variation of the output terminal of d type flip flop.
4. leak detection circuit according to claim 3, is characterized in that, the current output terminal of on-off element is also connected to pull-up resistor.
5. leak detection circuit according to claim 3, is characterized in that, the reset terminal of described d type flip flop is defaulted as high level, is low level during reset operation.
6. leak detection circuit according to claim 1, is characterized in that, also comprises clamping circuit, is attempted by the second input end input voltage two ends.
7. according to the leak detection circuit described in any one in claim 1-6, it is characterized in that, described moisture signal collecting unit comprises humidity sensitive resistance, and the voltage of the second input end is with the change in voltage at humidity sensitive resistance two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410245797.1A CN103994862A (en) | 2014-06-04 | 2014-06-04 | Leakage detecting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410245797.1A CN103994862A (en) | 2014-06-04 | 2014-06-04 | Leakage detecting circuit |
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| CN103994862A true CN103994862A (en) | 2014-08-20 |
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| CN201410245797.1A Pending CN103994862A (en) | 2014-06-04 | 2014-06-04 | Leakage detecting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679894A (en) * | 2015-11-06 | 2017-05-17 | 北京中电科电子装备有限公司 | Water leakage detecting method and water leakage detecting device for scribing machine |
| CN110207913A (en) * | 2019-07-03 | 2019-09-06 | 北京嘀嘀无限科技发展有限公司 | Hermetization testing method, device and storage medium, the automobile of battery pack |
| CN110749623A (en) * | 2019-10-28 | 2020-02-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Underwater environment discrimination circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567000A (en) * | 1979-06-25 | 1981-01-24 | Kansai Electric Power Co Inc:The | Detector for leakage of vapor |
| JPH0787827B2 (en) * | 1990-02-28 | 1995-09-27 | ホシザキ電機株式会社 | Deep-fried food frying detection device and deep-fried food frying time display device in cooker for deep-fried food |
| CN101106264A (en) * | 2006-07-14 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | Waterproof automatic protection device of electronic device |
| CN202142836U (en) * | 2011-04-29 | 2012-02-08 | 中国电子科技集团公司第三十六研究所 | Over-current signal detection circuit |
| CN102565514A (en) * | 2010-12-14 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Voltage drop detecting circuit |
| CN203869823U (en) * | 2014-06-04 | 2014-10-08 | 安徽江淮汽车股份有限公司 | Seepage detection circuit |
-
2014
- 2014-06-04 CN CN201410245797.1A patent/CN103994862A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567000A (en) * | 1979-06-25 | 1981-01-24 | Kansai Electric Power Co Inc:The | Detector for leakage of vapor |
| JPH0787827B2 (en) * | 1990-02-28 | 1995-09-27 | ホシザキ電機株式会社 | Deep-fried food frying detection device and deep-fried food frying time display device in cooker for deep-fried food |
| CN101106264A (en) * | 2006-07-14 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | Waterproof automatic protection device of electronic device |
| CN102565514A (en) * | 2010-12-14 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Voltage drop detecting circuit |
| CN202142836U (en) * | 2011-04-29 | 2012-02-08 | 中国电子科技集团公司第三十六研究所 | Over-current signal detection circuit |
| CN203869823U (en) * | 2014-06-04 | 2014-10-08 | 安徽江淮汽车股份有限公司 | Seepage detection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679894A (en) * | 2015-11-06 | 2017-05-17 | 北京中电科电子装备有限公司 | Water leakage detecting method and water leakage detecting device for scribing machine |
| CN110207913A (en) * | 2019-07-03 | 2019-09-06 | 北京嘀嘀无限科技发展有限公司 | Hermetization testing method, device and storage medium, the automobile of battery pack |
| CN110749623A (en) * | 2019-10-28 | 2020-02-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Underwater environment discrimination circuit |
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Application publication date: 20140820 |