CN106160440A - A kind of straight-flow system and control unit thereof and detection method - Google Patents
A kind of straight-flow system and control unit thereof and detection method Download PDFInfo
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- CN106160440A CN106160440A CN201610591486.XA CN201610591486A CN106160440A CN 106160440 A CN106160440 A CN 106160440A CN 201610591486 A CN201610591486 A CN 201610591486A CN 106160440 A CN106160440 A CN 106160440A
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- protection device
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- flow system
- output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention provides a kind of straight-flow system and control unit thereof and detection method, first according to the pre-conditioned protection device outputing enable signal to straight-flow system；Then the output voltage of protection device is detected；Judge whether the output voltage of protection device is less than preset security value again；When the output voltage of protection device is less than preset security value, and the output voltage of protection device less than duration of preset security value more than the first preset duration when, it is determined that protection device is normal, and removes enable signal；When the output voltage of protection device is more than or equal to preset security value, and the output voltage of protection device more than or equal to duration of preset security value more than the second preset duration when, it is determined that protection device fault；And then achieve automatic detection for protection device, it is equally applicable even if protection device is external protection device, periodically it can be detected automatically according to pre-conditioned being able to, confirm its validity, it is ensured that straight-flow system safe and reliable.
Description
Technical field
The present invention relates to DC source safe mode technical field, particularly to a kind of straight-flow system and control unit thereof and inspection
Survey method.
Background technology
In the application scenario of DC source, when carrying out circuit maintenance or other emergency case occurring, need DC source
Output voltage be limited within safe range so that system enter safe mode.To this end, typically require increase such as Fig. 1 institute
Parallel protection device shown in the tandem protection device shown or Fig. 2, by enabling the conducting of signal control respective switch
And shutoff, to be limited in voltage Vout within safe range.In concrete actual application, by ensureing DC source and being connect electricity consumption
The safety of equipment, needs periodically to detect the protection device of system.
Existing detection scheme is generally divided into manually and automatically two kinds, the i.e. artificial trigger protection device of manual detection scheme root
Judge that whether protection device is normal according to the result after its action, but the detection cycle of manual approach and frequency are uncontrollable, uncomfortable
For requiring the application occasion of periodic detection；And automatic scheme is generally directed to the situation that protection device is positioned at device interior, setting
For (before normal work) during unlatching or periodically detecting protection device, this detection process belongs to opening of device process
A part, eliminate human intervention process, but be not particularly suited for external protection device.
In the case of outside protection device is positioned at DC source and electrical equipment, the detection to this protection device generally requires
It is controlled by DC source or electrical equipment, therefore, build the detecting system of complete set, periodically automatically to detect it, really
Recognize its validity, it is ensured that system safe and reliable, be problem demanding prompt solution.
Content of the invention
The present invention provides a kind of straight-flow system and control unit thereof and detection method, external to solve to lack in prior art
The problem of the automatic detection scheme of protection device.
For realizing described purpose, the technical scheme that the application provides is as follows:
A kind of detection method of straight-flow system, comprising:
According to the pre-conditioned protection device outputing enable signal to straight-flow system；
Detect the output voltage of described protection device；
Judge whether the output voltage of described protection device is less than preset security value；
When the output voltage of described protection device is less than described preset security value, and the output voltage of described protection device is little
In the duration of described preset security value more than the first preset duration when, it is determined that described protection device is normal, and removes described
Enable signal；
When the output voltage of described protection device is more than or equal to described preset security value, and the output electricity of described protection device
When pressing the duration being more than or equal to described preset security value more than the second preset duration, it is determined that described protection device fault.
Preferably, also include after the described step judging described protection device fault: outputting alarm signal.
Preferably, also include:
Judge that described protection device is normal and the electrical equipment of described straight-flow system or conversion equipment state normal after, control
Make described straight-flow system and enter normal mode of operation.
Preferably, described electrical equipment or conversion equipment include: DC/DC converter, accessory power supply and control unit, and institute
State accessory power supply for the output power taking from described DC/DC converter, be that described control unit is powered；Described straight-flow system
Detection method was also wrapped before the described step according to the pre-conditioned protection device outputing enable signal to described straight-flow system
Include:
Control the output voltage of described DC/DC converter for presetting supply voltage.
Preferably, described preset security value is 30V；Described first preset duration is 100 milliseconds, described second preset duration
It is 1 second.
A kind of control unit of straight-flow system, comprising:
Instruction module, for according to the pre-conditioned protection device outputing enable signal to straight-flow system；
Detection module, for detecting the output voltage of described protection device；
Judge module, whether the output voltage for judging described protection device is less than preset security value；
Determination module, for being less than described preset security value, and described protection dress when the output voltage of described protection device
The output voltage put less than duration of described preset security value more than the first preset duration when, it is determined that described protection device is just
Often, and remove described enable signal；When the output voltage of described protection device is more than or equal to described preset security value, and described guarantor
The output voltage of protection unit more than or equal to duration of described preset security value more than the second preset duration when, it is determined that described guarantor
Protection unit fault.
Preferably, also include: alarm module, after being used for judging described protection device fault, outputting alarm signal.
Preferably, also include: the first control module, for judging that described protection device is normal and the use of described straight-flow system
Electricity equipment or conversion equipment state normal after, control described straight-flow system and enter normal mode of operation.
A kind of straight-flow system, comprising: DC source, protection device and electrical equipment or conversion equipment；Wherein:
Described DC source is used for exporting direct current；
Described protection device is connected between described DC source and described electrical equipment or conversion equipment, is used for transmitting described
Direct current or according to receive enable signal be defined in output voltage within preset security value；
Described electrical equipment or conversion equipment include: converter, accessory power supply, load or electrical network and any of the above-described described
The control unit of straight-flow system；
Described accessory power supply is for from described converter power taking, being that described control unit is powered.
Preferably, described DC source is: battery, electric capacity or photovoltaic battery panel；
Described protection device includes: be series at the corresponding of described DC source output and described electrical equipment or conversion equipment
Switch between input, and/or, it is parallel to the switch between described DC source and described electrical equipment or conversion equipment；
Described converter includes: DC/AC converter and/or DC/DC converter.
Preferably, described converter includes DC/DC converter, and described accessory power supply is for from described DC/DC conversion
The output power taking of device, when powering for described control unit, described control unit also includes: the second control module, is used for controlling
The output voltage of described DC/DC converter is for presetting supply voltage.
The detection method of the described straight-flow system that the present invention provides, first outputs enable signal to direct current according to pre-conditioned
The protection device of system；Then the output voltage of described protection device is detected；The output voltage judging described protection device again is
No less than preset security value；When the output voltage of described protection device is less than described preset security value, and described protection device
Output voltage less than duration of described preset security value more than the first preset duration when, it is determined that described protection device is normal,
And remove described enable signal；When the output voltage of described protection device is more than or equal to described preset security value, and described protection
The output voltage of device more than or equal to duration of described preset security value more than the second preset duration when, it is determined that described protection
Plant failure；And then achieve automatically detecting for described protection device, even if described protection device is external protection device
It is equally applicable, periodically it can be detected automatically according to described pre-conditioned being able to, confirm its validity, it is ensured that institute
State the safe and reliable of straight-flow system.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention or prior art, below will be to embodiment or existing
In having technology to describe, the accompanying drawing of required use is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, all right
Obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the protection device of the DC source that prior art provides；
Fig. 2 is the structural representation of another protection device of the DC source that prior art provides；
Fig. 3 is the flow chart of the detection method of the straight-flow system that the embodiment of the present invention provides；
Fig. 4 is another flow chart of the detection method of the straight-flow system that another embodiment of the present invention provides；
Fig. 5 is the structural representation of the control unit of the straight-flow system that another embodiment of the present invention provides；
Fig. 6 is another structural representation of the control unit of the straight-flow system that another embodiment of the present invention provides；
Fig. 7 is another structural representation of the control unit of the straight-flow system that another embodiment of the present invention provides；
Fig. 8 is the structural representation of the straight-flow system that another embodiment of the present invention provides；
Fig. 9 is another structural representation of the straight-flow system that another embodiment of the present invention provides.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings to the present invention for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
Detailed description of the invention be described in detail.
The present invention provides the detection method of a kind of straight-flow system, with solve prior art lacks external protection device from
The problem of dynamic detection scheme.
Concrete, the detection method of described straight-flow system, as shown in Figure 3, comprising:
S101, according to the pre-conditioned protection device outputing enable signal to straight-flow system；
S102, the output voltage detecting described protection device；
S103, judge that whether the output voltage of described protection device is less than preset security value；
When the output voltage of described protection device is less than described preset security value, and the output voltage of described protection device is little
In the duration of described preset security value more than the first preset duration when, step S104, just judging described protection device
Often, and remove described enable signal；
When the output voltage of described protection device is more than or equal to described preset security value, and the output electricity of described protection device
Pressure more than or equal to duration of described preset security value more than the second preset duration when, step S105, judge described guarantor
Protection unit fault.
In actual application, described protection device could be arranged to be in normally closed pattern, i.e. not having under normal circumstances
In the case of stating enable signal, described protection device normally closed, output voltage Vout；According to described pre-conditioned, such as arrive
Reach regular self-inspection time, auxiliary electric electric when or when urgent or fault, described in described protection device will receive
Enable signal, enter safe mode, output it voltage Vout and be limited within described preset security value.In order to ensure described guarantor
The validity of protection unit, can realize the detection for described protection device by above-mentioned steps.
In order to ensure the correctness of the result detecting for described protection device, can be by judging described protection dress
Whether the output voltage Vout putting exceedes described first preset duration, to described guarantor less than the duration of described preset security value
Whether protection unit enters safe mode confirms.When judging that described protection device is normal, and after removing described enable signal, institute
The output voltage Vout stating protection device recovers normal, and described straight-flow system enters normal operating conditions.
And if the output voltage Vout of described protection device is more than or equal to described preset security value, can be described by judging
The output voltage Vout of protection device more than or equal to duration of described preset security value whether exceed described second preset when
Long, guarantee the correctness of the testing result of described protection device, when the output voltage Vout of described protection device is more than or equal to
When the duration of described preset security value exceedes described second preset duration, then it is assumed that described protection device can not normally enter
Safe mode, i.e. can determine that described protection device fault.
In addition, in concrete actual application, according to its concrete applied environment, it may be necessary to described protection device is entered
Row output voltage detection repeatedly and the confirmation process of duration, i.e. can be final with repeated execution of steps S102 and S103
Result of determination to described protection device fault.
The detection method of the described straight-flow system that the present embodiment provides, can obtain described protection device by above-mentioned steps
The testing result of normal or fault, it is achieved that for the automatic detection of described protection device, even if described protection device is for outward
Put protection device to be equally applicable, periodically it can be detected automatically according to described pre-conditioned being able to, confirm that it is effective
Property, it is ensured that described straight-flow system safe and reliable.The detection method of the described straight-flow system that the present invention provides is particularly well-suited to
The demand to straight-flow system safety utilization of electric power for the North America UL1741 standard, and without increasing extra detection equipment, be beneficial to be widely popularized.
In another specific embodiment of the present invention, on the basis of Fig. 3, also include after step S105: output is accused
Alert signal.
After confirming that described protection device can not enter safe mode, can by described control unit output alarm signal,
Notify that operating personnel are further processed.Now, if described protection device still can normally closed, in principle described direct current system
System still can normally work, and simply there is the risk of direct current protecting.Therefore, it can according to system actual demand, decide whether to continue
Start described straight-flow system to normal operating condition (but having to last for exporting described alarm signal).
Preferably, on the basis of Fig. 3, the detection method of described straight-flow system also includes:
Judge that described protection device is normal and the electrical equipment of described straight-flow system or conversion equipment state normal after, control
Make described straight-flow system and enter normal mode of operation.
After described control unit can first confirm that the state of described electrical equipment or conversion equipment is normal, then to described protection
Device detects, and complete the detection of described protection device with guarantee after, described straight-flow system can be directly entered normal Working mould
Formula；Or, it is also possible to first described protection device is detected after described accessory power supply and described control unit normally work,
After guaranteeing that it can normally work, more described electrical equipment or conversion equipment are confirmed, it is determined that described protection device is normal, and
Remove described enable signal, make described straight-flow system enter normal mode of operation.
Preferably, on the basis of Fig. 3, described electrical equipment or conversion equipment include: DC/DC converter, auxiliary electricity
Source and control unit, and described accessory power supply is for from the output power taking of described DC/DC converter, being that described control unit supplies
Electricity；The detection method of described straight-flow system, as shown in Figure 4, also included before step S101:
S100, control the output voltage of described DC/DC converter for presetting supply voltage.
When described accessory power supply is used for the output power taking from described DC/DC converter, powers for described control unit,
DC/DC can be utilized to convert by the output voltage of the described DC/DC converter of described control unit control for presetting supply voltage
The DC capacitor storage energy as much as possible of device, in case described during the detection of described protection device utilize for accessory power supply.
Preferably, described preset security value is 30V；Described first preset duration is 100 milliseconds, described second preset duration
It is 1 second.
Described preset security value can require to be set according to related safety, such as 30V, naturally it is also possible to for other tools
Body numerical value, is only a kind of example herein, is not necessarily limited to this, can be set according to actual conditions.
Described first preset duration can be according to the response time of system auxiliary electricity supporting time and/or described protection device
Determine, such as 100 milliseconds；Described second preset duration can be more than described first preset duration, as being chosen as 1 second.It is only one herein
Plant example, be not necessarily limited to this, can be set according to actual conditions.
Another embodiment of the present invention additionally provides the control unit of a kind of straight-flow system, as shown in Figure 5, comprising: instruction mould
Block the 101st, detection module the 102nd, judge module 103 and determination module 104；Wherein:
Instruction module 101 is for according to the pre-conditioned protection device outputing enable signal to straight-flow system；
Detection module 102 is for detecting the output voltage of described protection device；
Whether judge module 103 is less than preset security value for the output voltage judging described protection device；
Determination module 104 is for being less than described preset security value, and described protection when the output voltage of described protection device
The output voltage of device less than duration of described preset security value more than the first preset duration when, it is determined that described protection device
Normally, and remove described enable signal；When the output voltage of described protection device is more than or equal to described preset security value and described
The output voltage of protection device more than or equal to duration of described preset security value more than the second preset duration when, it is determined that described
Protection device fault.
The control unit of the described straight-flow system that the present embodiment provides, can obtain described protection device by above-mentioned principle
The testing result of normal or fault, it is achieved that for the automatic detection of described protection device, even if described protection device is for outward
Put protection device to be equally applicable, periodically it can be detected automatically according to described pre-conditioned being able to, confirm that it is effective
Property, it is ensured that described straight-flow system safe and reliable.
In actual applications, can be according to described pre-conditioned setting so that the control unit of described straight-flow system,
Not only reach regular self-inspection time, auxiliary electric electric when or urgent or fault when, can also according to actual needs,
Work as electric network power-fail, the DC source in described straight-flow system or miscellaneous equipment breaking out of fire, and other unsafe conditions being likely to occur
When, described enable signal can be exported by instruction module 101, and then described protection device is controlled so that described protection
Device enters safe mode, and then ensures security of system.
Preferably, on the basis of Fig. 5, as shown in Figure 6, the control unit of described straight-flow system also includes: alarm mould
Block 105, after being used for judging described protection device fault, outputting alarm signal.
After confirming that described protection device can not enter safe mode, can be notified by alarm module 105 output alarm signal
Operating personnel are further processed.Now, if described protection device still can normally closed, described straight-flow system is still in principle
Can normally work, simply there is the risk of direct current protecting.Therefore, it can according to system actual demand, decide whether to continue to start
Described straight-flow system is to normal operating condition, but has to last for exporting described alarm signal.
Preferably, on the basis of Fig. 5, as it is shown in fig. 7, the control unit of described straight-flow system also includes: the first control
Molding block 106 is normal for judging described protection device normal and described straight-flow system electrical equipment or conversion equipment state
Afterwards, control described straight-flow system and enter normal mode of operation.
Judge that described protection device is normal and the electrical equipment of described straight-flow system or conversion equipment state all normal it
After, then control described straight-flow system entrance normal mode of operation, the security of described straight-flow system can be increased.
Another embodiment of the present invention additionally provides a kind of straight-flow system, as shown in Figure 8, comprising: the 100th, DC source protects dress
Put 200 and electrical equipment or conversion equipment 300；Wherein:
Protection device 200 is connected between DC source 100 and electrical equipment or conversion equipment 300；
Electrical equipment or conversion equipment 300 include: converter the 301st, accessory power supply the 302nd, control unit 303 and load or electricity
Net 304；
Control unit 303 is as shown in Figure 5, comprising: instruction module the 101st, detection module the 102nd, judge module 103 and judgement mould
Block 104.
Concrete operation principle is:
DC source 100 is used for exporting direct current；
Protection device 200 is for transmitting described direct current or being defined in output voltage pre-according to the enable signal receiving
If within safety value；
Accessory power supply 302 is for from converter 301 power taking, being that control unit 303 is powered；
Instruction module 101 is for outputing enable signal to protection device 200 according to pre-conditioned；
Detection module 102 is for detecting the output voltage of protection device 200；
Whether judge module 103 is less than preset security value for the output voltage judging protection device 200；
Determination module 104 is for being less than described preset security value, and protection device when the output voltage of protection device 200
The output voltage of 200 less than duration of described preset security value more than the first preset duration when, it is determined that described protection device
Normally, and remove described enable signal；When the output voltage of protection device 200 is more than or equal to described preset security value, and protection
The output voltage of device 200 more than or equal to duration of described preset security value more than the second preset duration when, it is determined that described
Protection device fault.
The described straight-flow system that the present embodiment provides, can obtain described protection device by above-mentioned principle normal or former
The testing result of barrier, it is achieved that for the automatic detection of described protection device, even if described protection device is external protection device
It is equally applicable, periodically it can be detected automatically according to described pre-conditioned being able to, confirm its validity, it is ensured that institute
State the safe and reliable of straight-flow system.The detection method of the described straight-flow system that the present invention provides is particularly well-suited to North America UL1741 mark
The accurate demand to straight-flow system safety utilization of electric power, and without increasing extra detection equipment, be beneficial to be widely popularized.
What deserves to be explained is, described straight-flow system also can use periodically manually for the automatic detection of protection device 200
Mode add their confirmation, although it is inefficient, and operability is strong, but described straight-flow system can realize to protection dress
Put 200 while automatically detection, it is also possible to accept the mode of this kind of manual detection.
In actual applications, can be according to described pre-conditioned setting so that described straight-flow system, not only reach
Time of regular self-inspection, auxiliary electric electric when or urgent or fault when, can also according to actual needs, when electrical network falls
Electricity, the DC source in described straight-flow system or miscellaneous equipment breaking out of fire, and other be likely to occur unsafe condition when, can pass through
Control unit 303 exports described enable signal, and then is controlled protection device 200 so that protection device 200 enters safety
Pattern, and then ensure security of system.
Preferably, DC source 100 can be: battery, electric capacity or photovoltaic battery panel；
Protection device 200 includes: be series at the corresponding defeated of DC source 100 output and electrical equipment or conversion equipment 300
Enter the switch between end, and/or, it is parallel to the switch between DC source 100 and electrical equipment or conversion equipment 300；
Converter 301 includes: DC/AC converter and/or DC/DC converter.
In concrete actual application, the form of DC source 101 does not limits, and can be voltage source or current source, such as direct current
The DC source etc. that source device, battery, electric capacity, photovoltaic battery panel and other generator units are formed, its output voltage is Vdc；
Protection device 200 can use formula scheme in parallel or series, it is also possible to is combination mode, generally arranges and which is
Normally closed pattern, and the acceptable control enabling signal En of its switch, during normal work, protection device 200 closes, its output voltage
For Vout (when using parallel scheme, Vout=Vdc)；
Electrical equipment or conversion equipment 300 can be electrical equipment or generating equipment, such as photovoltaic DC-to-AC converter, and it inputs termination
Receive voltage Vout, can be as required when urgent or fault, output enables signal En control protective unit 200 and connects
Or disconnecting DC source 100 so that described straight-flow system enters safe mode, and then reaches to protect the purpose of whole system.
In addition, the form that implements of electrical equipment or conversion equipment does not also limit, can be that an exchange electricity consumption sets
Standby or electrical network, it is also possible to be direct-flow electricity utilization apparatus or DC load.
Preferably, as shown in Figure 6, control unit 303 also includes: alarm module 105, is used for judging protection device 200 event
After barrier, outputting alarm signal.
After confirming that protection device 200 can not enter safe mode, accessory power supply 302 need to work on, and can be by controlling
Unit 303 output alarm signal, notifies that operating personnel are further processed.Now, if protection device 200 still can be just normally closed
Closing, described straight-flow system still can normally work in principle, simply there is the risk of direct current protecting.Therefore, it can according to system real
Border demand, decides whether to continue to start described straight-flow system and (but has to last for exporting described alarm letter to normal operating condition
Number).
Preferably, it as it is shown in fig. 7, control unit 303 also includes: the first control module 106, is used for judging protection device
200 is normal and the electrical equipment of described straight-flow system or conversion equipment state normal after, controlling described straight-flow system and just entering
Normal mode of operation.
Preferably, converter 301 includes DC/DC converter, and accessory power supply 302 is for from described DC/DC converter
Output power taking, be control unit 303 when powering, control unit 303 is additionally operable to control the output electricity of described DC/DC converter
Pressure is for presetting supply voltage.
Fig. 9 is the present embodiment electrical equipment or conversion equipment 300 schematic diagram, specifically includes that DC/DC converter the 311st, DC/
AC converter the 312nd, accessory power supply the 302nd, control unit 303 and load or electrical network 304；Wherein,
DC/DC converter 311 is for being converted to direct current by direct current, and its form does not limits, and is used for mating Vout and Vbus
Voltage, selects as required, it is also possible to do not need (Vout and Vbus is joined directly together and connects)；
DC/AC converter 312 is for being converted to alternating current by direct current, and its form does not limits, for being converted to direct current
Alternating current, its input is output as Vac for Vbus；
Load or electrical network 304 connect DC/AC converter 312, load or electrical network 304 can be single-phase also can be three-phase shape
Formula, is not specifically limited herein；
Accessory power supply 302 can be with power taking in Vbus and/or Vac, when only with Vbus power taking, and protection dress during normal work
Put 200 sealing voltage output Vout, and require that now DC/DC converter 311 can bypass Vout to Vbus, and use Vac to take
Electricity or then not limited when using Vbus and Vac simultaneously power taking；
Control unit 303 is powered by accessory power supply 302, and exportable control signal Ctr sets to control electrical equipment or conversion
Standby 300, and enable signal En can be exported as required with control protective unit 200.
DC/DC converter 311 can bypass Vout to Vbus, and it is for auxiliary electricity that Vbus is adjusted to suitable voltage
Source 302, only when Vbus power taking situation, utilizes the DC capacitor storage of DC/DC converter 311 and DC/AC converter 312 to the greatest extent
Energy that may be many in case during protection device 200 detection, described utilizes for accessory power supply；According to Vac power taking or
During Vbus and Vac mixing power taking, then control the output voltage of described DC/DC converter without control unit 303 for presetting power supply
Voltage.
After protection device 200 responds described enable signal entrance safe mode, its output voltage Vout is pulled low, generally
In the case of therefore can need to ensure that accessory power supply 302 reliably supplies during detection less than the operating voltage of accessory power supply 302
Electricity.One is the characteristic utilizing DC/DC converter 311, blocks Vbus and discharges to Vout so that accessory power supply 302 can utilize
The energy of Vbus supports the detection time of overprotection device 200；One is to utilize Vac to power to accessory power supply 302, then at electrical network just
Without the concern for supporting time under normal state.
Other concrete operation principles are same as the previously described embodiments, and here is omitted.
In the present invention, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is real with other
Executing the difference of example, between each embodiment, identical similar portion sees mutually.For device disclosed in embodiment
Speech, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, related part sees method part explanation
?.
The above, be only presently preferred embodiments of the present invention, not makees any pro forma restriction to the present invention.Though
The right present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It any is familiar with those skilled in the art
Member, without departing under technical solution of the present invention ambit, may utilize the method for the disclosure above and technology contents to the present invention
Technical scheme makes many possible variations and modification, or is revised as the Equivalent embodiments of equivalent variations.Therefore, every without departing from
The content of technical solution of the present invention, according to the technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent
Change and modification, in the range of all still falling within technical solution of the present invention protection.
Claims (11)
1. the detection method of a straight-flow system, it is characterised in that include:
According to the pre-conditioned protection device outputing enable signal to straight-flow system；
Detect the output voltage of described protection device；
Judge whether the output voltage of described protection device is less than preset security value；
When the output voltage of described protection device is less than described preset security value, and the output voltage of described protection device is less than institute
State duration of preset security value more than the first preset duration when, it is determined that described protection device is normal, and removes described enable
Signal；
When the output voltage of described protection device is more than or equal to described preset security value, and the output voltage of described protection device is big
In the duration equal to described preset security value more than the second preset duration when, it is determined that described protection device fault.
2. the detection method of straight-flow system according to claim 1, it is characterised in that judge described protection device described
Also include after the step of fault: outputting alarm signal.
3. the detection method of straight-flow system according to claim 1, it is characterised in that also include:
Judge that described protection device is normal and the electrical equipment of described straight-flow system or conversion equipment state normal after, control institute
State straight-flow system and enter normal mode of operation.
4. the detection method of straight-flow system according to claim 3, it is characterised in that described electrical equipment or conversion equipment
Including: DC/DC converter, accessory power supply and control unit, and described accessory power supply is for from the output of described DC/DC converter
End power taking, is that described control unit is powered；The detection method of described straight-flow system enables letter described according to pre-conditioned output
Number to described straight-flow system protection device step before also include:
Control the output voltage of described DC/DC converter for presetting supply voltage.
5. the detection method of straight-flow system according to claim 1, it is characterised in that described preset security value is 30V；Institute
Stating the first preset duration is 100 milliseconds, and described second preset duration is 1 second.
6. the control unit of a straight-flow system, it is characterised in that include:
Instruction module, for according to the pre-conditioned protection device outputing enable signal to straight-flow system；
Detection module, for detecting the output voltage of described protection device；
Judge module, whether the output voltage for judging described protection device is less than preset security value；
Determination module, for being less than described preset security value, and described protection device when the output voltage of described protection device
Output voltage less than duration of described preset security value more than the first preset duration when, it is determined that described protection device is normal,
And remove described enable signal；When the output voltage of described protection device is more than or equal to described preset security value, and described protection
The output voltage of device more than or equal to duration of described preset security value more than the second preset duration when, it is determined that described protection
Plant failure.
7. the control unit of straight-flow system according to claim 6, it is characterised in that also include: alarm module, is used for sentencing
After fixed described protection device fault, outputting alarm signal.
8. the control unit of straight-flow system according to claim 6, it is characterised in that also include: the first control module, uses
In judge that described protection device is normal and the electrical equipment of described straight-flow system or conversion equipment state normal after, control is described
Straight-flow system enters normal mode of operation.
9. a straight-flow system, it is characterised in that include: DC source, protection device and electrical equipment or conversion equipment；Wherein:
Described DC source is used for exporting direct current；
Described protection device is connected between described DC source and described electrical equipment or conversion equipment, is used for transmitting described direct current
Electricity or according to receive enable signal be defined in output voltage within preset security value；
Described electrical equipment or conversion equipment include: converter, accessory power supply, load or electrical network and the arbitrary institute of claim 6 to 8
The control unit of the straight-flow system stated；
Described accessory power supply is for from described converter power taking, being that described control unit is powered.
10. straight-flow system according to claim 9, it is characterised in that described DC source is: battery, electric capacity or light
Volt cell panel；
Described protection device includes: be series at the corresponding input of described DC source output and described electrical equipment or conversion equipment
Switch between end, and/or, it is parallel to the switch between described DC source and described electrical equipment or conversion equipment；
Described converter includes: DC/AC converter and/or DC/DC converter.
11. straight-flow systems according to claim 9, it is characterised in that described converter includes DC/DC converter, and
Described accessory power supply is used for the output power taking from described DC/DC converter, when powering for described control unit, and described control list
Unit also includes: the second control module, for controlling the output voltage of described DC/DC converter for presetting supply voltage.
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| CN201610591486.XA CN106160440B (en) | 2016-07-25 | 2016-07-25 | A kind of direct current system and its control unit and detection method |
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| CN106160440B (en) | 2019-04-09 |
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