CN104793046A - System and method for detecting high voltages - Google Patents
System and method for detecting high voltages Download PDFInfo
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- CN104793046A CN104793046A CN201510201198.4A CN201510201198A CN104793046A CN 104793046 A CN104793046 A CN 104793046A CN 201510201198 A CN201510201198 A CN 201510201198A CN 104793046 A CN104793046 A CN 104793046A
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Abstract
The invention provides a system and a method for detecting high voltages. The system for detecting the high voltages comprises a sampling signal changeover switch module, a signal acquiring and processing module, a signal isolation module and a can (controller area network) bus communication module. The system and the method have the advantages that the production cost and unnecessary resource wastage can be reduced, signals of on-off states of high-voltage bus switches can be safely and reliably fed, and the same circuit module can have a total voltage detecting function, a float voltage detecting function and a high-voltage bus on-off state detecting function by the aid of the system and the method.
Description
Technical field
The present invention relates to the safety monitoring technology field in high voltage electrical system, particularly relate to a kind of high pressure detection system and method.
Background technology
As everyone knows, in the industry relating to high-pressure system, especially new energy electric motor vehicle industry; Total voltage, this technical indicator of floating voltage are extremely important, can be directly connected to a series of aspects problems such as production, safety.And all can at one or more bus switch of the upper series connection of every root high voltage bus (as Fig. 1) element of the Switch such as air switch (this can be relay also can be) in all high-pressure systems, can this bus switch normally closed and shutoff, also directly has influence on the series of problems such as production and personal safety.
At present, total voltage detection, floating voltage detecting and high voltage bus on off state detect and are detected by three kinds of mutual independently detection modules.Can increase a lot of hardware cost unavoidably like this, while increase detection module, mating in the algorithm arrangement that verifies of module and intermodule also can be allowed to become more complicated, virtually also can increase more human cost, cause the limited wasting of resources.
Present high voltage bus switch is divided into 2 kinds, and a kind of do not have signal feedback, and a kind of is carry signal feedback (built-in feedback is got an electric shock).Every band signal feedback, its feedback contact can be with high voltage bus switch in parallel, also can be the switch state signal feedback utilizing electromagnetic induction etc. to carry out high voltage bus switch.But in high voltage bus switching process, because a series of uncertainties such as various electric arc effect, mechanical strain cause the non-normal working of the main contacts of high voltage bus switch, (non-normal working here refers to: time needs close, still remain open state, or closed not thorough etc. can not normally closed situation; When needing to disconnect, be still kept closed, or disconnect not thorough etc. can not normally open situation).Now the feedback contact of high voltage bus switch cannot the failure message of its switch of Normal Feedback, as the high voltage bus switch of electromagnetic relay type.Easily cause misjudgment.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of high pressure detection system.
The invention provides a kind of high pressure detection system, comprising:
Sampled signal change-over switch module, is responsible for switching mutually at high voltage bus end and floating end realizing successively gathering total voltage, floating voltage, high voltage bus switch state signal;
Signal acquisition process module, be connected with described sampled signal change-over switch module, it is for the collection of signal;
Signal isolation module, is transferred to can bus communication module after being isolated by the signal in described signal acquisition process module;
Can bus communication module comprises processing module and can bus transceiver, and described processing module is used for that the signal after described signal isolation module is dealt into bus by can bus transceiver and gets on; Simultaneously described processing module is used for controlling all gate-controlled switches of described sampled signal change-over switch module, is gathered the on off state of total voltage signal, floating voltage signal and high voltage bus switch by all gate-controlled switches controlling described sampled signal change-over switch module.
As a further improvement on the present invention, described signal acquisition process module comprises divider resistance, sampling resistor, A/D modular converter, by described sampled signal change-over switch module, required high-voltage signal is incorporated into the two ends of divider resistance string, then via after a string divider resistance dividing potential drop, the collection of signal is then carried out by A/D modular converter.
As a further improvement on the present invention, described signal acquisition process module also comprises filtering circuit, amplifying circuit, and described input amplifier is connected with described filtering circuit, and described amplification circuit output end is connected with described A/D modular converter; By described sampled signal change-over switch module, required high-voltage signal is incorporated into the two ends of divider resistance string, then via after a string divider resistance dividing potential drop, carry out filtered signal via described filtering circuit and enter described amplifying circuit, by the Signal transmissions after amplification to described A/D modular converter.
As a further improvement on the present invention, described signal isolation module comprises signal isolating chip, and described signal isolating chip is transferred to can bus communication module after being isolated by the signal in described signal acquisition process module.
As a further improvement on the present invention, described signal isolating chip is photoelectric isolated chip or electromagnetic isolation chip.
As a further improvement on the present invention, described signal isolation module also comprises insulating power supply, and described insulating power supply is used for the Power supply in described can bus communication module to be transferred in described signal acquisition process module by isolation.
As a further improvement on the present invention, described insulating power supply is transformer.
As a further improvement on the present invention, described processing module is single-chip microcomputer.
The invention has the beneficial effects as follows: the present invention can reduce production cost and the unnecessary wasting of resources, the signal feedback of the on off state of high voltage bus switch can be allowed reliably safer simultaneously, and the present invention can realize in same circuit module: total voltage detects, floating voltage detecting, high voltage bus on off state detects, these three kinds of functions.
Accompanying drawing explanation
Fig. 1 is current high pressure Cleaning Principle block diagram;
Fig. 2 is high pressure detection system theory diagram of the present invention.
Embodiment
In order to reduce production cost and the unnecessary wasting of resources, the signal feedback of the on off state of high voltage bus switch can be allowed reliably safer simultaneously.The invention provides a kind of high pressure detection system, this high pressure detection system can realize in same circuit module: total voltage detects, floating voltage detecting, and high voltage bus on off state detects, these three kinds of functions.
As shown in Figure 2, the invention discloses a kind of high pressure detection system, comprise sampled signal change-over switch module, signal acquisition process module, signal isolation module, can bus communication module, wherein:
Sampled signal change-over switch module, is responsible for switching mutually at high voltage bus end and floating end realizing successively gathering the signals such as total voltage, floating voltage, high voltage bus switch state; It is realized by 4 gate-controlled switches, according to the difference of concrete system requirements, can suitably increase and reduce the quantity of gate-controlled switch.
Signal acquisition process module, by divider resistance, sampling resistor, filtering circuit, amplifying circuit, A/D modular converter forms.By signal shift switch module, required high-voltage signal is incorporated into the two ends of divider resistance string, then via after a string divider resistance dividing potential drop, the voltage signal at sampling resistor two ends is controlled in certain scope.Enter filtering circuit link, the requirement of real-time of this filtering circuit is very high, otherwise can easily cause signal lag thus interfere with next signal.Enter into amplifying circuit link via filtered signal, required signal is amplified, then carried out the collection of signal by A/D modular converter.Difference according to concrete system suitably can omit filtering circuit link and amplifying circuit link.
Signal isolation module, primarily of signal isolating chip and insulating power supply composition.This signal isolating chip can be Phototube Coupling, also can be the signal isolating chips such as electromagnetic isolation.This insulating power supply can be transformer, also can be the module that special power source isolating chip etc. is used for carrying out insulating power supply.This signal isolating chip is transferred in rear class can bus communication module after being responsible for the signal of signal acquisition process module to isolate.This insulating power supply is responsible for always being selected by the can of rear class the Power supply in communication module to be transferred in the signal acquisition process module of prime by isolation.Simultaneously can according to the real needs of system, suitable integrates signal isolating chip and insulating power supply.
Can bus communication module, mainly contains single-chip microcomputer and can bus transceiver composition.Signal after signal isolation module can be dealt into bus by can bus transceiver and get on by this single-chip microcomputer.This single-chip microcomputer is used to all gate-controlled switches controlling sampled signal change-over switch module simultaneously.By controlling all gate-controlled switches of sampled signal change-over switch module.Gather the on off state of total voltage signal, floating voltage signal and high voltage bus switch.
The invention discloses a kind of high-voltage detecting method, this high-voltage detecting method is detected by high pressure detection system, comprises at this high-voltage detecting method:
1. total voltage detects:
Closed S
p, S
hremaining switch remains open state.A/D modular converter is utilized to detect
The voltage U at sampling resistor R two ends
r.
2. floating voltage detecting:
The floating voltage at 2.1 load 1 two ends is:
Closed s
1, s
nremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.
The floating voltage at 2.2 load 2 two ends is:
Closed S
2, s
nremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.
By that analogy.
The floating voltage at 2.3 (n-1)th load two ends is:
Closed S
n-1, s
nremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.
3. high voltage bus on off state detects:
Whether 3.1 detect high voltage bus switch 1 normally disconnects:
The first step, closed s
1, S
premaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Convert out U
1.
Second step, closed S
p, S
hremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Calculate stagnation pressure.
3rd step, if judge U
1< < U
alwaysthen high voltage bus switch 1 is described, normally disconnects.If U
1≈ U
alwaysthen illustrate that high voltage bus switch 1 does not normally disconnect, and is still in conducting closure state, reports high voltage bus switch fault.Its reason can be the adhesion that the arcing of high voltage bus switch contact causes, and also can cause normally disconnecting by vapour corrosion.Etc. a series of reason.
Whether 3.2 detect high voltage bus switch 2 normally disconnects:
The first step, closed S
2, S
premaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Convert out U
2.
Second step, closed S
p, S
hremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Calculate stagnation pressure.
3rd step, if judge U
2< < U
alwaysthen high voltage bus switch 2 is described, normally disconnects.If U
2≈ U
alwaysthen illustrate that high voltage bus switch 2 does not normally disconnect, and is still in conducting closure state, reports high voltage bus switch fault.Its reason can be the adhesion that the arcing of high voltage bus switch contact causes, and also can cause normally disconnecting by vapour corrosion.Etc. a series of reason.By that analogy.The on off state of high voltage bus switch N-1 can be detected successively.
Whether 3.3 detect high voltage bus switch N normally disconnects:
The first step, closed S
h, S
nremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Convert out U
2.
Second step, closed S
p, S
hremaining switch remains open state.A/D modular converter is utilized to detect the voltage U at sampling resistor R two ends
r.Calculate stagnation pressure.
3rd step, if judge U
n< < U
alwayshigh voltage bus switch N is then described, normally disconnects.If U
2≈ U
alwaysthen illustrate that high voltage bus switch 2 does not normally disconnect, and is still in conducting closure state, reports high voltage bus switch fault.Its reason can be the adhesion that the arcing of high voltage bus switch contact causes, and also can cause normally disconnecting by vapour corrosion.Etc. a series of reason.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. a high pressure detection system, is characterized in that, comprising:
Sampled signal change-over switch module, is responsible for switching mutually at high voltage bus end and floating end realizing successively gathering total voltage, floating voltage, high voltage bus switch state signal;
Signal acquisition process module, be connected with described sampled signal change-over switch module, it is for the collection of signal;
Signal isolation module, is transferred to can bus communication module after being isolated by the signal in described signal acquisition process module;
Can bus communication module comprises processing module and can bus transceiver, and described processing module is used for that the signal after described signal isolation module is dealt into bus by can bus transceiver and gets on; Simultaneously described processing module is used for controlling all gate-controlled switches of described sampled signal change-over switch module, is gathered the on off state of total voltage signal, floating voltage signal and high voltage bus switch by all gate-controlled switches controlling described sampled signal change-over switch module.
2. high pressure detection system according to claim 1, it is characterized in that, described signal acquisition process module comprises divider resistance, sampling resistor, A/D modular converter, by described sampled signal change-over switch module, required high-voltage signal is incorporated into the two ends of divider resistance string, then via after a string divider resistance dividing potential drop, the collection of signal is then carried out by A/D modular converter.
3. high pressure detection system according to claim 2, it is characterized in that, described signal acquisition process module also comprises filtering circuit, amplifying circuit, and described input amplifier is connected with described filtering circuit, and described amplification circuit output end is connected with described A/D modular converter; By described sampled signal change-over switch module, required high-voltage signal is incorporated into the two ends of divider resistance string, then via after a string divider resistance dividing potential drop, carry out filtered signal via described filtering circuit and enter described amplifying circuit, by the Signal transmissions after amplification to described A/D modular converter.
4. high pressure detection system according to claim 1, it is characterized in that, described signal isolation module comprises signal isolating chip, and described signal isolating chip is transferred to can bus communication module after being isolated by the signal in described signal acquisition process module.
5. high pressure detection system according to claim 4, is characterized in that, described signal isolating chip is photoelectric isolated chip or electromagnetic isolation chip.
6. high pressure detection system according to claim 1, it is characterized in that, described signal isolation module also comprises insulating power supply, and described insulating power supply is used for the Power supply in described can bus communication module to be transferred in described signal acquisition process module by isolation.
7. high pressure detection system according to claim 6, is characterized in that, described insulating power supply is transformer.
8. high pressure detection system according to claim 1, is characterized in that, described processing module is single-chip microcomputer.
9. adopt a high-voltage detecting method for high pressure detection system described in any one of claim 1 to 8, it is characterized in that,
Total voltage detects:
Closed s
p, s
bremaining switch remains open state, utilizes A/D modular converter to detect the voltage U at sampling resistor R two ends
r,
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510201198.4A CN104793046A (en) | 2015-04-24 | 2015-04-24 | System and method for detecting high voltages |
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|---|---|---|---|
| CN201510201198.4A CN104793046A (en) | 2015-04-24 | 2015-04-24 | System and method for detecting high voltages |
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| CN104793046A true CN104793046A (en) | 2015-07-22 |
Family
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| CN201510201198.4A Pending CN104793046A (en) | 2015-04-24 | 2015-04-24 | System and method for detecting high voltages |
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Cited By (1)
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| CN105675959A (en) * | 2016-02-01 | 2016-06-15 | 硅谷数模半导体（北京）有限公司 | High-voltage circuit current detection circuit |
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Application publication date: 20150722 |