CN109672156A - The electronic switch containing soft start and defencive function for direct-flow distribution system - Google Patents
The electronic switch containing soft start and defencive function for direct-flow distribution system Download PDFInfo
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- CN109672156A CN109672156A CN201910101795.8A CN201910101795A CN109672156A CN 109672156 A CN109672156 A CN 109672156A CN 201910101795 A CN201910101795 A CN 201910101795A CN 109672156 A CN109672156 A CN 109672156A
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- soft start
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- 239000004065 semiconductor Substances 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 4
- 230000001012 protector Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of electronic switches containing soft start and defencive function for direct-flow distribution system, including the back-up protection circuit (100) being sequentially connected, main switch circuit (200), the soft starting circuit (300) in parallel with main switch circuit (200), current collection circuit (400) and for monitoring and saving back-up protection circuit (100), main switch circuit (200), soft starting circuit (300), the work state information of current collection circuit (400) simultaneously controls main switch circuit (200) by the sampled result that current collection circuit (400) are transmitted, the intelligent control circuit (500) of soft starting circuit (300), wherein main switch circuit (200) includes main switch (Q1), soft starting circuit (300) includes Soft Start Switch (Q S), main switch (Q1) and Soft Start Switch (Qs) are semiconductor switch.Electronic switch provided by the invention can greatly improve the reliability of direct-flow distribution system, reduce the failure rate of system, reduce the cost of system.
Description
Technical field
The present invention relates to smart grid fields, and in particular to a kind of containing soft start and to protect function for direct-flow distribution system
The electronic switch of energy.
Background technique
With popularizing for DC power-supply system application, the demand of DC distribution protective switch is increasing, current common
Have mechanical switch, such as dc circuit breaker, D.C. contactor.But in actual application, due in direct current system
Middle source side and load-side have biggish capacitor, are closing the switch moment, due to the charge and discharge of capacitor, can cause very big
Dash current, this feature is different from AC system, dash current peak value often far beyond the rated value of switch element, this
Sample seriously affects the service life of switch element, causes high failure rate；In addition different from AC system, direct current system does not have the period
Property zero crossing, cause to be difficult to arc extinguishing when switch OFF, the design complexity that switchs in this way improves, and causes switch price than handing over
Stream switch is more expensive.
Summary of the invention
The present invention is mentioned to overcome the technical problem that mechanical switch failure rate is higher and expensive in the prior art
For a kind of electronic switch containing soft start and defencive function for direct-flow distribution system, the controllable switch function of contactor is combined
Can, the overcurrent protection function of breaker, and soft start function is increased, and monitoring and communication function etc., it can greatly improve
The reliability of direct-flow distribution system reduces the failure rate of system, reduces the cost of system.
A kind of electronic switch containing soft start and defencive function for direct-flow distribution system provided by the invention, comprising:
Back-up protection circuit: one end is connected with DC power output end, the other end and main switch circuit and soft starting circuit
It is connected, for the disengagement failure branch in load overcurrent or short circuit and main switch circuit failure；
Main switch circuit: both ends be connected respectively with back-up protection circuit and current collection circuit and with soft starting circuit simultaneously
Connection, is protected for being switched on or switched off DC load branch, and to the overcurrent or short circuit of load；Main switch circuit includes that master opens
It closes, main switch is semiconductor switch；
Soft starting circuit: both ends be connected respectively with back-up protection circuit and current collection circuit and with main switch circuit simultaneously
Connection, for connecting limitation dash current in advance before main switch circuit connects circuit, for after main switch circuit connection
It turns off and is that next soft start is prepared；Soft starting circuit includes the Soft Start Switch being arranged in series and soft start resistance；
Current collection circuit: one end is connected with main switch circuit and soft starting circuit, the other end and DC load input terminal
It is connected, carries out current sample for DC load, and sampled result is sent to intelligent control circuit；
Intelligent control circuit: for carrying out switch control to main switch circuit and soft starting circuit according to external command, from
And realize the function of contactor, for receiving the sampled result of current collection circuit transmission, for being tied according to the sampling
The relay protective scheme of fruit and internal preset applies switch control to switching circuit, thus realize the defencive function for being similar to breaker,
For monitoring and saving back-up protection circuit, main switch circuit, soft starting circuit and the work state information of current collection circuit,
To realize monitoring functions more more than contactor and breaker.
Electronic switch of the present invention receives external command by intelligent control circuit, carries out switch control, this function
It can be similar to contactor, when contactor is opened, since the capacitor in the circuit at contactor both ends is in different voltages level,
Contactor opens moment, will generate very big dash current；And soft start is first carried out, that is, is existed when normally opening in the present invention
Main switch first connects Soft Start Switch before connecting, and at this time can limit starting current with the concatenated soft start resistance of Soft Start Switch
In safe range, soft start terminates system after one section of delay, i.e., main switch both ends are in same current potential, at this moment open master again
Switch, it will be able to which the generation for avoiding dash current avoids the risk of component overcurrent and over-voltage in system, and it is reliable to improve it
Property and service life.After main switch is fully switched on, Soft Start Switch is disconnected, to carry out the preparation of soft start next time.
When there is biggish fault current, the defencive function similar to breaker, and electronics is may be implemented in electronic switch
The Preservation tactics of switch can be more flexible, PLC technology.DC load is sampled by current collecting device.Work as electricity
When flowing smaller, current collecting device can be a sampling resistor；When electric current is larger, current collecting device can be one suddenly
That sensor.Collected electric current is handled in intelligent controller, if it is confirmed that overcurrent or short circuit, then according to overcurrent
Degree realizes the defencive functions such as inverse time lag, delay or current quick-breaking；Due to being electronic switch, for being several times as much as rated current
Short trouble, may be implemented the current quick-breaking function of delicate grade, and such short circuit current has no chance significantly to increase at all.For
Different loads to be protected, the action current of electronic switch and actuation time can be set by software.
Electronic switch containing soft start and defencive function of the present invention for direct-flow distribution system, as preferred side
Formula, Soft Start Switch are semiconductor switch.
Electronic switch containing soft start and defencive function of the present invention for direct-flow distribution system, as preferred side
Formula, back-up protection circuit are fastp-acting fuse.
Due to being possible to that short-circuit condition is presented when semiconductor switch there is the fault mode, i.e. switch failure of short circuit, in order to
Ensure that such case lower switch remains to excision fault current, has concatenated a fastp-acting fuse in the input stage of switch, it is normal to transport
Fastp-acting fuse will not fuse when row, only when main switch loses defencive function, and occurs short trouble at this time, quick fuse
Device cuts off faulty circuit the back-up protection as main switch.
Electronic switch containing soft start and defencive function of the present invention for direct-flow distribution system, as preferred side
Formula is equipped with the first surge suppressor between fastp-acting fuse and main switch circuit, soft starting circuit, in current collection circuit and
The second surge suppressor is equipped between DC load.
Since the speed of semiconductor switch is exceedingly fast, cause line current pace of change fast, the inductance of such route will be felt
Very big voltage should be gone out, threatened to semiconductor switch, it is therefore desirable to add surge suppression respectively in the input and output side of switch
In general device processed needs TVS device that can meet the requirements.
Electronic switch containing soft start and defencive function of the present invention for direct-flow distribution system, as preferred side
Formula, intelligent control circuit are also used to user to the setting of switch rated current and the programming of protection curve.Since switch is using
Safe current can change with the variation of runing time in the process, it will usually according to featured configuration one of specific switching circuit
Curve is protected, the setting electric current value of any point-in-time is respectively less than the safe current value switched on curve, when a certain runing time point
Electric current be greater than protection curve on corresponding electric current when, intelligent control circuit can control switch circuit open, and then to circuit rise
To being protected.
Electronic switch containing soft start and defencive function of the present invention for direct-flow distribution system, as preferred side
Formula, intelligent control circuit carry out information exchange by communication interface and exterior.
The present invention in use, when direct-flow distribution system is normally opened, first opens Soft Start Switch, soft start electricity
Stream is limited with the concatenated soft start resistance of Soft Start Switch, and after one section of delay, Soft Start-up Process terminates, then opens master
Switch, dash current will not be generated when main switch is opened, the maximum current for flowing through main switch is exactly maximum load current, in master
After opening, Soft Start Switch is turned off, to prepare next soft start period；When direct-flow distribution system normal turn-off,
Directly turn off main switch, the safety of the first Surge Protector and the second Surge Protector protection main switch and Soft Start Switch；When
Main switch loses defencive function, and when there is short trouble, and circuit protection device fusing cuts off faulty circuit.
For the present invention due to using semiconductor devices to substitute mechanical switch as Soft Start Switch, actuation time is big from Millisecond
Amplitude shorten to Microsecond grade, and bring advantage is when determination needs disconnecting circuit, and electronic switch can be with quick response, to make
Fault current does not have the further up time.When using mechanical switch, even if control circuit determination needs to disconnect, but by
Too long in actuation time, in actual switch-off, fault current is significantly promoted, so that needing to extinguish operation electric arc
Energy is also substantially improved, and affects reliability and service life.Using electronic switch can to avoid component overcurrent in system and
The risk of over-voltage improves its reliability and service life；It can substantially be dropped using semiconductor switch substitution mechanical switch simultaneously
Low cost.
The present invention further increases back-up protection circuit in branch, loses defencive function in main switch, and short circuit occur
When failure, faulty circuit is cut off by back-up protection circuit, further increases the reliability of system.
Detailed description of the invention
Fig. 1 is a kind of electronic switch containing soft start and defencive function for direct-flow distribution system.
Fig. 2 is 1 schematic diagram of embodiment.
Appended drawing reference:
100, back-up protection circuit；200, main switch circuit；300, soft starting circuit；400, current collection circuit；500,
Intelligent control circuit；Rs: soft start resistance；Qs: Soft Start Switch；Q1: main switch；F1: fastp-acting fuse；Z1: the first surge
Suppressor；Z2: the second surge suppressor.
Specific embodiment
As shown in Figure 1, a kind of electronic switch containing soft start and defencive function for direct-flow distribution system, comprising:
Back-up protection circuit 100: one end is connected with DC power output end, the other end and main switch circuit 200 and soft
Dynamic circuit 300 is connected, for the disengagement failure branch in load overcurrent or short circuit and 200 failure of main switch circuit；Back-up protection
Circuit 100 is fastp-acting fuse F1；
Main switch circuit 200: both ends be connected respectively with back-up protection circuit 100 and current collection circuit 400 and with soft
Dynamic circuit 300 is in parallel, protects for being switched on or switched off DC load branch, and to the overcurrent or short circuit of load；Main switch
Circuit 200 includes main switch Q1, and main switch Q1 is semiconductor switch；
Soft starting circuit 300: both ends are connected with back-up protection circuit 100 and current collection circuit 400 respectively and open with master
Powered-down road 200 is in parallel, for connecting limitation dash current in advance before main switch circuit 200 connects circuit, for opening in master
Powered-down road 200 turns off after connecting and prepares for next soft start；Soft starting circuit 300 includes that the soft start being arranged in series is opened
Closing Qs and soft start resistance Rs, Soft Start Switch Qs is semiconductor switch；In fastp-acting fuse F1 and main switch circuit 200, soft
The first surge suppressor Z1 is equipped between starting circuit 300,；
Current collection circuit 400: one end is connected with main switch circuit 200 and soft starting circuit 300, and the other end and direct current are negative
It carries input terminal to be connected, carries out current sample for DC load, and sampled result is sent to intelligent control circuit 500；In electricity
It flows and is equipped with the second surge suppressor Z2 between Acquisition Circuit 400 and DC load
Intelligent control circuit 500: for being opened according to external command main switch circuit 200 and soft starting circuit 300
Control is closed, for receiving the sampled result of the transmission of current collection circuit 400, for the protection according to sampled result and internal preset
Logic applies switch control to switching circuit, for monitoring and saving back-up protection circuit 100, main switch circuit 200, soft start
The work state information of circuit 300 and current collection circuit 400；Intelligent control circuit 500 passes through communication interface and external system
Information transmission is carried out, for user to the setting of switch rated current and the programming of protection curve.
Embodiment 1
As shown in Fig. 2, the voltage rating of direct current system is 800V, load rating power is 8kW, and load capacitance is
2000uF；It is formal after being supported on direct current supply two seconds to start.
Rated current is 10A, chooses soft start resistance Rs=50Ohm, then peak impulse current is 800V/50Ohm=
16A.Starting time constant is 50Ohm × 2000uF=0.1sec, and starting delay can be set to 1 second.Soft start resistance Rs's
Rated power can be selected as 500W.Main switch Q1 can be selected as the silicon carbide mos pipe of 1200V, conducting resistance 100mOhm；Soft
Dynamic switch Qs can be selected as the silicon carbide mos pipe of 1200V, conducting resistance 300mOhm；Back-up protection can select voltage rating 1kV,
The fastp-acting fuse F1 of rated current 20A.
The present embodiment in use, when direct-flow distribution system is normally opened, first opens Soft Start Switch Qs, and soft
Streaming current is limited by soft start resistance Rs, and after one section of delay, Soft Start-up Process terminates, then opens main switch Q1, in master
Switch Q1 will not generate dash current when opening, and the maximum current for flowing through main switch Q1 is exactly maximum load current, in main switch
After Q1 is opened, Soft Start Switch Qs is turned off, to prepare next soft start period；When direct-flow distribution system normal turn-off,
The directly safety of shutdown main switch Q1, the first Surge Protector Z1 and the second Surge Protector Z2 protection Soft Start Switch Qs；When
Main switch Q1 loses defencive function, and when there is short trouble, and fastp-acting fuse F1 fusing cuts off faulty circuit.
Described above to be merely exemplary for the purpose of the present invention, and not restrictive, those of ordinary skill in the art understand,
Without departing from the spirit and scope defined by the claims, any modification, variation or the equivalents that can be made are all
It will fall under the scope of the present invention.
Claims (7)
1. a kind of electronic switch containing soft start and defencive function for direct-flow distribution system, it is characterised in that: include:
Back-up protection circuit (100): one end is connected with DC power output end, the other end and main switch circuit (200) and soft
Dynamic circuit (300) are connected, for the disengagement failure branch in load overcurrent or short circuit and the main switch circuit (200) failure；
Main switch circuit (200): both ends be connected respectively with the back-up protection circuit (100) and current collection circuit (400) and
In parallel with the soft starting circuit (300), overcurrent or short circuit for being switched on or switched off DC load branch, and to load carry out
Protection；The main switch circuit (200) includes main switch (Q1), and the main switch (Q1) is semiconductor switch；
Soft starting circuit (300): both ends be connected respectively with the back-up protection circuit (100) and current collection circuit (400) and
It is in parallel with the main switch circuit (200), for connecting limitation punching in advance before the main switch circuit (200) connect circuit
Electric current is hit, for turning off after the main switch circuit (200) are connected and preparing for next soft start；The soft start electricity
Road (300) includes the Soft Start Switch (Qs) being arranged in series and soft start resistance (Rs)；
Current collection circuit (400): one end is connected with the main switch circuit (200) and the soft starting circuit (300), another
End is connected with DC load input terminal, carries out current sample for the DC load, and sampled result is sent to intelligent control
Circuit (500) processed；
Intelligent control circuit (500): it is used for according to external command to the main switch circuit (200) and the soft starting circuit
(300) switch control is carried out, for receiving the sampled result of the current collection circuit (400) transmission, for according to institute
The relay protective scheme for stating sampled result and internal preset applies switch control to the switching circuit (200), for monitoring and saving
The back-up protection circuit (100), the main switch circuit (200), the soft starting circuit (300) and current acquisition electricity
The work state information on road (400).
2. the electronic switch containing soft start and defencive function according to claim 1 for direct-flow distribution system, special
Sign is: the Soft Start Switch (Qs) is semiconductor switch.
3. the electronic switch containing soft start and defencive function according to claim 2 for direct-flow distribution system, special
Sign is: the back-up protection circuit (100) is fastp-acting fuse (F1).
4. the electronic switch containing soft start and defencive function according to claim 3 for direct-flow distribution system, special
Sign is: being equipped between (300) in the fastp-acting fuse (F1) and the main switch circuit (200), the soft starting circuit
First surge suppressor (Z1) is equipped with the second Surge suppression between the current collection circuit (400) and the DC load
Device (Z2).
5. according to claim 1 described in any one of -4 it is a kind of for direct-flow distribution system containing soft start and defencive function
Electronic switch, it is characterised in that: the intelligent control circuit (500) is also used to setting and protection of the user to switch rated current
The programming of curve.
6. according to claim 1 described in any one of -4 it is a kind of for direct-flow distribution system containing soft start and defencive function
Electronic switch, it is characterised in that: the intelligent control circuit (500) carries out information exchange by communication interface and exterior.
7. the electronic switch containing soft start and defencive function according to claim 5 for direct-flow distribution system, special
Sign is: the intelligent control circuit (500) carries out information exchange by communication interface and exterior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910101795.8A CN109672156A (en) | 2019-02-01 | 2019-02-01 | The electronic switch containing soft start and defencive function for direct-flow distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910101795.8A CN109672156A (en) | 2019-02-01 | 2019-02-01 | The electronic switch containing soft start and defencive function for direct-flow distribution system |
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| CN109672156A true CN109672156A (en) | 2019-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910101795.8A Pending CN109672156A (en) | 2019-02-01 | 2019-02-01 | The electronic switch containing soft start and defencive function for direct-flow distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172359A (en) * | 2021-12-06 | 2022-03-11 | 固赢科技(深圳)有限公司 | Isolation circuit based on MOS (Metal oxide semiconductor) tube soft start and soft start control method |
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