CN106972467A - A kind of power frequency constant flow high pressure power supply with hardware open loop protection circuit - Google Patents
A kind of power frequency constant flow high pressure power supply with hardware open loop protection circuit Download PDFInfo
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- CN106972467A CN106972467A CN201710089391.2A CN201710089391A CN106972467A CN 106972467 A CN106972467 A CN 106972467A CN 201710089391 A CN201710089391 A CN 201710089391A CN 106972467 A CN106972467 A CN 106972467A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 101
- 229910052710 silicon Inorganic materials 0.000 claims description 101
- 239000010703 silicon Substances 0.000 claims description 101
- 239000000203 mixture Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 16
- 230000015556 catabolic process Effects 0.000 description 9
- 239000000428 dust Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000009183 running Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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- 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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/125—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 for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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Abstract
The present invention provides a kind of power frequency constant flow high pressure power supply with hardware open loop protection circuit; specially a kind of single phase industrial frequence constant flow high pressure power supply or a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit with hardware open loop protection circuit; hardware open loop protection circuit is connected with transformer primary side; it can solve the problem that the defect of open loop protection circuit in traditional power frequency constant flow high pressure power supply; quick open-circuit-protection is realized, the reliability of constant flow high pressure power supply is improved.
Description
Technical field
It is specially a kind of carry firmly the present invention relates to a kind of power frequency constant flow high pressure power supply with hardware open loop protection circuit
The single phase industrial frequence constant flow high pressure power supply of part open loop protection circuit or a kind of three-phase main-frequency with hardware open loop protection circuit are permanent
Flow high voltage power supply.
Background technology
With industrialized fast-developing and deepen constantly, the air pollution problems inherent that industrial discharge is caused is increasingly severe,
Control atmosphere pollution problem has important practical significance.High-pressure electrostatic precipitation method is with its efficiency of dust collection height, the particle of processing dust
Spend that scope is wide, operation stability and reliability are high, go into operation after maintenance management is convenient etc. that series of advantages turns into current industrial production
A kind of increasingly extensive advanced dust removal method of middle application.High-voltage electrostatic dust separator includes body construction and power supply device two
Point, using different body construction and power supply, have a great impact to the life-span and efficiency of dust collection of cleaner.Dedusting electricity
The normal operating conditions in source is corona discharge, and output state is with certain voltage and current, generally in order to improve
Efficiency of dust collection, as far as possible improve power supply output voltage and electric current, when voltage improve to a certain extent, the gas meeting with dust
It is breakdown, disruptive discharge is caused, equivalent to the load short circuits of power supply, electric current acutely increases suddenly, all caused to power supply and body
Considerable damage, therefore current source is more suitable for this load occasion that often short circuit is struck sparks.Power frequency constant flow high pressure power supply due to
The ability of natural anti-loading short circuit, and the impact in load short circuits to power supply and body is smaller, therefore be very suitable for
Electric precipitation field.
Power frequency constant flow high pressure power utilization inductance, electric capacity, inductance composition resonant network Voltage-current conversion property with
And the principle with constant current output characteristic, power frequency constant flow high pressure power supply is divided into single phase industrial frequence constant flow high pressure power supply and three-phase main-frequency is permanent
Flow high voltage power supply.As shown in figure 1, that single phase industrial frequence constant flow high pressure power input is single phase ac 380V voltage sources V1, Ran Houjing
One is crossed to convert single-phase electricity potential source by the first inductance L1, the first electric capacity C1, the second inductance L2 single-phase LCL resonant networks constituted
For single-phase current, it is then applied on the first duplex frequency boostering transformer TI1, the connection of the first duplex frequency boostering transformer TI1 secondary
Industrial frequency AC, is rectified into direct current, is then applied to the first equivalent load by the first single-phase rectification bridge BD1 being made up of high voltage silicon rectifier stack
On R1, the second electric capacity C2.As shown in Fig. 2 that three-phase main-frequency constant flow high pressure power input is three-phase alternating current 380V voltage source V2,
Then by one by the 3rd inductance L3, the 4th inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance
L8, the 3rd electric capacity C3, the 4th electric capacity C4, the three-phase symmetrical LCL resonant networks of the 5th electric capacity C5 compositions convert three-phase voltage source
For three-phase current source, be then applied on three-phase main-frequency step-up transformer TYY1, three-phase main-frequency step-up transformer TYY1 primary sides and
Secondary is all wye connection, the three-phase commutation bridge BD2 that secondary connection is made up of high voltage silicon rectifier stack, three-phase main-frequency AC rectification Cheng Zhi
Stream, is then applied on the second equivalent load R2, the 6th electric capacity C6.
Fig. 1 and Fig. 2 describe the Basic Topological of power frequency constant flow high pressure power supply, on this basis, in order to control perseverance
The output current in stream source, there is two methods.The first is the input voltage for controlling constant flow high pressure power supply, is specifically by antiparallel
Group of Silicon Controlled Rectifier into AC voltage adjusting circuit realize, for single phase industrial frequence constant flow high pressure power supply, plus single-phase on the basis of Fig. 1
AC voltage adjusting circuit, becomes the circuit shown in Fig. 3, can by the first controllable silicon SR1 of regulation, the second controllable silicon SR2 angle of flow
To control the electric current that power supply is exported, for three-phase main-frequency constant flow high pressure power supply, plus three phase ac voltage regulation electricity on the basis of Fig. 2
Road, becomes the circuit shown in Fig. 4, by adjusting the 3rd controllable silicon SR3, the 4th controllable silicon SR4, the 5th controllable silicon SR5, the 6th
Controllable silicon SR6, the 7th controllable silicon SR7, the 8th controllable silicon SR8 angle of flow can control the electric current that power supply is exported.Second of side
Method is the size for not adjusting input voltage, but by adjusting the impedance magnitude of LCL resonant networks, carrys out regulation power supply output current
Size, specific implementation is divided into multigroup LCL resonant networks, according to the requirement of output current size with contactor respectively
The LCL resonant networks switchings of difference group numbers are effectively equivalent to the parallel connection of several LCL resonant networks, and joint group number in circuit
Difference, then the equiva lent impedance of LCL resonant networks is different, then output current is different.Because switching LCL resonant networks are technically needed
Many contactors are wanted, this not only adds cost, the reliability reduced, and the regulation of constant flow high pressure electric power outputting current
Polarized, i.e., one grade one grade of regulation, rather than continuous electrodeless regulation, therefore realize that constant current is high with AC voltage adjusting circuit
The regulation of voltage source output current is more much better than regulation LCL resonant network impedances.
Power frequency constant flow high pressure power supply is unable to open running, if load open circuit, infinitely great equivalent to load impedance, then boosts
Transformer secondary output voltage can be very high, and the high voltage silicon rectifier stack of step-up transformer and rectifier bridge will be breakdown, therefore to give power frequency
The perfect open loop protection circuit of constant flow high pressure Power Management Design.The open loop protection circuit of existing power frequency constant flow high pressure power supply is can not
Lean on, insecure place is, when load open circuit, the original edge voltage of step-up transformer starts rise, is increased to certain journey
Degree (being usually AC value 250V), open loop protection circuit is capable of detecting when open circuit, then controls a protection relay
Device adhesive, after this protective relay adhesive, can cause main contactor to control the dead electricity of circuit, as a result contactor tripping, cut-out
The input power of constant flow high pressure power supply, reaches the purpose of open-circuit-protection, but this safeguard measure is defective, when detecting
When open circuit occurs, one relay of adhesive, contactor disconnection is then reproduced into, the adhesive and disconnection of relay and contactor are
The adhesive and disconnection of its mechanical contact, because the machinery inertial of attracting device is limited, the adhesive of relay and the disconnection of contactor
The time is all needed, the delay of relay and contactor cascade action can reach a few tens of milliseconds, that is from open loop state quilt
Detecting contactor completion deenergization needs the time of a few tens of milliseconds, and power supply will run tens millis under open loop state
Second, this few tens of milliseconds makes the output voltage of power supply very high enough, punctures step-up transformer and rectifier bridge silicon stack, therefore it is this by after
The time of the open loop protection circuit action of electrical equipment and contactor composition is too slow, in many in the case of have little time protection, use relay
Device and this mechanical contact-type element of contactor can not complete quick open loop protection circuit.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of power frequency constant current height with hardware open loop protection circuit
Voltage source, can solve the problem that the defect of open loop protection circuit in traditional power frequency constant flow high pressure power supply, realize quick open-circuit-protection, improve
The reliability of constant flow high pressure power supply.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：It is a kind of with hardware open loop protection circuit
Single phase industrial frequence constant flow high pressure power supply, including single phase ac 380V voltage sources V1, by the first inductance L1, the first electric capacity C1 and second electricity
The single-phase LCL resonant networks of sense L2 compositions, the first duplex frequency boostering transformer TI1 being connected on single-phase LCL resonant networks, connection
The first single-phase rectification bridge BD1 being made up of high voltage silicon rectifier stack in the first duplex frequency boostering transformer TI1 secondary, to be connected to first single-phase
The first equivalent load R1, the second electric capacity C2 on rectifier bridge BD1, single phase ac 380V voltage sources V1 and single-phase LCL resonant networks
It is additionally provided with the first controllable silicon SR1 and the second controllable silicon SR2 of control electric power outputting current, first duplex frequency boostering transformer
TI1 primary side is connected with hardware open loop protection circuit.
Preferably, the hardware open loop protection circuit includes being connected in the first duplex frequency boostering transformer TI1 primary side
The 4th single-phase rectification bridge BD4, the 11st resistance R11 that is connected on the 4th single-phase rectification bridge BD4 and the 11st electric capacity C11,
It is connected to the 12nd resistance R12 and the 12nd electric capacity C12 on the 11st electric capacity C11, the 11st electric capacity C11 and the 12nd
The first TVS diode Z1 and the second TVS diode Z2, one end and the tenth of the 11st electric capacity C1 are provided between resistance R12
It is provided with the 11st controllable silicon SR11 between two electric capacity C12 one end, the other end of the 12nd electric capacity C12 and the 11st controllable
The 13rd resistance R13 is provided between silicon SR11.
Preferably, the hardware open loop protection circuit also includes being connected to the 11st electric capacity C11 and the 11st controllable silicon
The 11st inductance L11 between SR11, second be connected between single phase ac 380V voltage sources V1 and the 11st inductance L11 protect
Protection circuit, second protection circuit includes the second duplex frequency boostering transformer being connected on single phase ac 380V voltage sources V1
TI2, the 3rd single-phase rectification bridge BD3 for being connected to the second duplex frequency boostering transformer TI2 secondary, it is connected to the 3rd single-phase rectification bridge
It is provided between the 14th resistance R14 and the 13rd electric capacity C13 on BD3, the 13rd electric capacity C13 and the 11st inductance L11
15th resistance R15 and the 13rd diode D13.
A kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit, including three-phase alternating current 380V voltages
Source V2, it is connected on three-phase alternating current 380V voltage sources V2 by the 3rd inductance L3, the 4th inductance L4, the 5th inductance L5, the 6th inductance
The three-phase symmetrical LCL that L6, the 7th inductance L7, the 8th inductance L8, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 are constituted is humorous
Vibrating network, the three-phase main-frequency step-up transformer TYY1 being connected on three-phase symmetrical LCL resonant networks, be connected to three-phase main-frequency boosting
Three-phase commutation bridge BD2 on transformer TYY1 secondary, the electricity of the second equivalent load R2 being connected on three-phase commutation bridge BD2 and the 6th
Hold between C6, three-phase alternating current 380V voltage sources V2 and three-phase symmetrical the LCL resonant networks provided with control electric power outputting current
3rd controllable silicon SR3, the 4th controllable silicon SR4, the 5th controllable silicon SR5, the 6th controllable silicon SR6, the 7th controllable silicon SR7 and the 8th can
Silicon SR8 is controlled, the primary side of the three-phase main-frequency step-up transformer TYY1 is connected with hardware open loop protection circuit.
Preferably, the hardware open loop protection circuit includes being connected to three-phase main-frequency step-up transformer TYY1 primary side
On the 25th three-phase commutation bridge BD25, the 11st resistance R11 and that is connected on the 25th three-phase commutation bridge BD25
11 electric capacity C11, the 12nd resistance R12 and the 12nd electric capacity C12 being connected on the 11st electric capacity C11, the 11st electricity
The first TVS diodes Z1 and the second TVS diode Z2, the 11st electric capacity are provided between appearance C11 and the 12nd resistance R12
The 11st controllable silicon SR11 is provided between C1 one end and the 12nd electric capacity C12 one end, the 12nd electric capacity C12's is another
The 13rd resistance R13 is provided between one end and the 11st controllable silicon SR11.
Preferably, the hardware open loop protection circuit also includes being connected to the 11st electric capacity C11 and the 11st controllable silicon
The 11st inductance L11 between SR11, second be connected between three-phase alternating current 380V voltage sources V2 and the 11st inductance L11 protect
Protection circuit, second protection circuit includes the second duplex frequency boostering transformer being connected on three-phase alternating current 380V voltage sources V2
TI2, the 3rd single-phase rectification bridge BD3 for being connected to the second duplex frequency boostering transformer TI2 secondary, it is connected to the 3rd single-phase rectification bridge
It is provided between the 14th resistance R14 and the 13rd electric capacity C13 on BD3, the 13rd electric capacity C13 and the 11st inductance L11
15th resistance R15 and the 13rd diode D13.
Beneficial effect：
The present invention provides a kind of single phase industrial frequence constant flow high pressure with hardware open loop protection circuit using above-mentioned technical proposal
Power supply and a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit, can solve the problem that traditional power frequency constant flow high pressure
The defect of open loop protection circuit in power supply, realizes quick open-circuit-protection, improves the reliability of constant flow high pressure power supply.
Brief description of the drawings
Fig. 1 is the structural representation of existing single phase industrial frequence constant flow high pressure power supply；
Fig. 2 is the structural representation of existing three-phase main-frequency constant flow high pressure power supply；
Fig. 3 is the structural representation of the existing single phase industrial frequence constant flow high pressure power supply with single phase ac regulation circuit；
Fig. 4 is the structural representation of the existing three-phase main-frequency constant flow high pressure power supply with three-phase ac voltage regulation circuit；
Fig. 5 is the structural representation of the embodiment of the present invention one；
Fig. 6 is the structural representation of the embodiment of the present invention two；
Fig. 7 is the structural representation of the embodiment of the present invention three.
Embodiment
Embodiment one：
As shown in figure 5, a kind of single phase industrial frequence constant flow high pressure power supply with hardware open loop protection circuit, including single phase ac
380V voltage sources V1, the single-phase LCL resonant networks being made up of the first inductance L1, the first electric capacity C1 and the second inductance L2, it is connected to
The first duplex frequency boostering transformer TI1 on single-phase LCL resonant networks, be connected to the first duplex frequency boostering transformer TI1 secondary by
First single-phase rectification bridge BD1 of high voltage silicon rectifier stack composition, the first equivalent load R1 being connected on the first single-phase rectification bridge BD1, the
Two electric capacity C2, single phase ac 380V voltage sources V1 are additionally provided with the first of control electric power outputting current with single-phase LCL resonant networks can
Silicon SR1 and the second controllable silicon SR2 is controlled, the primary side of the first duplex frequency boostering transformer TI1 is connected with hardware open loop protection circuit.
The hardware open loop protection circuit includes the 4th single-phase rectification bridge being connected in the first duplex frequency boostering transformer TI1 primary side
BD4, the 11st resistance R11 being connected on the 4th single-phase rectification bridge BD4 and the 11st electric capacity C11, it is connected to the 11st electric capacity
It is provided between the 12nd resistance R12 and the 12nd electric capacity C12 on C11, the 11st electric capacity C11 and the 12nd resistance R12
First TVS diode Z1 and the 2nd TVS diode Z2, one end of the 11st electric capacity C11 and the one of the 12nd electric capacity C12
The 11st controllable silicon SR11 is provided between end, is set between the other end and the 11st controllable silicon SR11 of the 12nd electric capacity C12
There is the 13rd resistance R13.
By the analysis to background technology, the root of problem is detected after overvoltage protection at once step-up transformer
The high voltage quick release of primary side is fallen, therefore the present invention uses power electronic switching rather than using mechanical switch come short-circuit transformation
The voltage of device primary side, after the voltage short circuit of step-up transformer primary side, the voltage of step-up transformer secondary is zero, is thus protected
The high-voltage rectifier bridge silicon stack of step-up transformer winding and secondary, specific circuit are as shown in figure 5, its basic functional principle is：When
During single phase ac 380V voltage sources V1 load open circuit, the first duplex frequency boostering transformer TI1 original edge voltage rise, the first power frequency
Step-up transformer TI1 original edge voltages pass through the 4th single-phase rectification bridge BD4 rectifications, then through the 11st resistance R11, the 11st electric capacity
The obtained voltage of C11 filtering can also be raised, when the 11st resistance R11, the 11st electric capacity C11 voltage rise to a certain extent,
When such as higher than protection voltage threshold, the first TVS diode Z1 and the second TVS diode Z2 will just be had by avalanche breakdown
Electric current flows through, and this electric current can form voltage, the 12nd resistance R12 and on the 12nd resistance R12 and the 12nd electric capacity C12
Voltage on 12 electric capacity C12 will trigger that the 11st controllable silicon SR11 is open-minded, and the 11st controllable silicon SR11 is once open-minded, then and
Four single-phase rectification bridge BD4 outputs are short-circuited, then the 4th single-phase rectification bridge BD4 inputs are also short-circuited, i.e. the first power frequency boosting transformation
Device TI1 primary sides are short-circuited, and original edge voltage is instantaneously dragged down, and play the high-voltage rectifier bridge silicon stack of protection step-up transformer and secondary
Effect.Here the threshold value of the first TVS diode Z1 and the second TVS diode Z2 breakdown voltages chooses extremely important, basis
Protect the threshold value of voltage to choose, such as when the rotection thresholds of primary voltage of transformer are set as 500V, then choose breakdown voltage
Threshold value is 250V TVS diode, and total breakdown voltage after two TVS diode series connection is exactly 500V, so works as transformer
When original edge voltage is more than 500V, TVS diode punctures, protection circuit action, and step-up transformer primary side is excessively electric by short-circuit at once
Pressure is eliminated at once, once overvoltage is eliminated, TVS diode recovers blocking state again.Even if the characteristic of controllable silicon is after turning on
Trigger signal revocation is fallen, as long as there is electric current to flow through, and it continues to conducting, even if so TVS diode recovers blocking state, not having
Electric current flows through, and such 12nd resistance R12 and the 12nd electric capacity C12 voltage is zero, i.e., the 11st controllable silicon SR11 is not touched
Signal, the 11st controllable silicon SR11 is still able to continue to turn on, and continues short-circuit step-up transformer primary side.Protection circuit is just liter
Pressure transformer primary side is shorted out, and due to above there is the presence of single-phase LCL resonant networks impedance, flows through the 4th single-phase rectification bridge BD4
Electric current can also be limited by this impedance, as long as therefore the 4th single-phase rectification bridge BD4 chooses enough through-current capability, can't
Washed out.When constant flow high pressure power supply is normally run, the first duplex frequency boostering transformer TI1 original edge voltages are not high, and the 4th is single-phase whole
The voltage flowed after bridge BD4 rectifications is not also high, and the first TVS diode Z1 and the second TVS diode Z2 will not be breakdown, and the such tenth
One controllable silicon SR11 does not have trigger signal without turning on, and such 4th single-phase rectification bridge BD4 secondary is equivalent to open circuit, to constant current
The normal operation of high voltage power supply does not have any influence.The essence of above-mentioned hardware open loop protection circuit is：When constant-current source normal work
When, the electric current of single-phase LCL resonant networks output flows into the first duplex frequency boostering transformer TI1 primary side, then passes through the first power frequency liter
Load is output to after pressure transformer TI1, the first single-phase rectification bridge BD1 silicon stack rectifications；When current source loadses are opened a way, open circuit is protected
Protection circuit is acted, and the electric current that single-phase LCL resonant networks are exported is flowed back to by the 4th single-phase rectification bridge BD4, and electric current will not flow
Enter the first duplex frequency boostering transformer TI1 primary sides, such first duplex frequency boostering transformer TI1 secondary, would not there will be no high pressure
Puncture step-up transformer and high-voltage rectifier bridge silicon stack.
Embodiment two：
As shown in fig. 6, with reference to Fig. 5, the hardware open loop protection circuit also includes being connected to the 11st electric capacity C11 and the
The 11st inductance L11 between 11 controllable silicon SR11, be connected to single phase ac 380V voltage sources V1 and the 11st inductance L11 it
Between the second protection circuit, second protection circuit includes being connected to the second power frequency liter on single phase ac 380V voltage sources V1
Pressure transformer TI2, the 3rd single-phase rectification bridge BD3 for being connected to the second duplex frequency boostering transformer TI2 secondary, to be connected to the 3rd single-phase
The 14th resistance R14 and the 13rd electric capacity C13 on rectifier bridge BD3, the 13rd electric capacity C13 and the 11st inductance L11 it
Between be provided with the 15th resistance R15 and the 13rd diode D13.
Although the circuit described by Fig. 5 can play a part of overvoltage protection of opening a way, there is incomplete place, when
When open loop protection circuit is acted, the 11st controllable silicon SR11 is turned on after being triggered, as long as the electric current flowed through is higher than its maintenance electricity
Stream will be constantly on, due to there is thyristor regulating volt circuit, i.e. the first controllable silicon SR1 before constant flow high pressure power supply, second can
Control silicon SR2 presence, the two devices can cause the output current of single-phase LCL resonant networks to have of short duration area of stopping, i.e., it is instantaneous
The region that electric current is zero, in this region, the electric current for flowing through the 11st controllable silicon SR11 is zero, such 11st controllable silicon
SR11 be may turn off, and the 11st controllable silicon SR11 mono- is closed, and protection circuit will disconnect and lose protective effect, work as constant flow high pressure
The single-phase LCL resonant networks output current of power supply walks out area of stopping, and when slowly becoming big again, this electric current can make boosting again
The original edge voltage rise of transformer, when the first duplex frequency boostering transformer TI1 original edge voltages are raised to a certain extent, can trigger and hold again
Road protection circuit action, SR11 turns on a step-up transformer original edge voltage and lowered again, when single-phase LCL resonant networks export electricity
Stream enter it is next stop area when, the 11st controllable silicon SR11 can be closed again, when single-phase LCL resonant networks output current is walked out
Stop area, again can again trigger protection circuit and open the 11st controllable silicon SR11, such open loop protection circuit can be by ceaselessly
Trigger, stop, triggering, stop again again, such state open-circuit protection circuit and step-up transformer are all bad, therefore right
Fig. 5 open loop protection circuit is improved further, and eliminates this state, and physical circuit is shown in Fig. 6, the electricity described in Fig. 6
Road is on the basis of Fig. 5, to add an inductance L11 of afterflow inductance the 11st, also has another to the 11st controllable silicon
SR11 provides the second protection circuit of conducting electric current, i.e., by the second duplex frequency boostering transformer TI2, the 3rd single-phase rectification bridge BD3, the
14 resistance R14, the 13rd electric capacity C13, the 15th resistance R15, a circuit of the 13rd diode D13 compositions.Second work
Frequency step-up transformer TI2 is voltage of the single phase ac 380V voltage source V1 transformations for exchange 12V, then by the 3rd single-phase rectifier
Bridge BD3 rectifications, the tenth resistance R14 and the 13rd electric capacity C13 filtering, form 15V or so dc source, then by the 15th electricity
Hinder R15 and the 13rd after-applied two ends to the 11st controllable silicon SR11 of diode D13.When constant flow high pressure power supply is normally run
When, when protection circuit does not work, the 11st controllable silicon SR11 is not turned on, due to the 11st controllable silicon SR11 two ends voltage much
More than 15V, therefore the 13rd diode D13 reversely ends, and 15V direct current does not have electric current output.When constant-current source open running
When, the first TVS diode Z1, the 2nd TVSZ2 are by avalanche breakdown, and the 11st controllable silicon SR11 is triggered conducting, equivalent to the 4th
Single-phase rectification bridge BD4 secondary one the 11st inductance L11 of series connection, as long as choosing the 11st inductance L11 value than the first power frequency liter
Pressure transformer TI1 equivalent magnetizing inductance is small more than 20 times, and the first duplex frequency boostering transformer TI1 primary sides are still approximately seen as short
Road, the electric current overwhelming majority of the single-phase LCL resonant networks output of constant flow high pressure power supply flows through the 11st inductance L11 of protection circuit,
By the impedance that the 11st inductance L11 is formed is very low, even if there is high current to flow through, the voltage formed is also very low, and such
One duplex frequency boostering transformer TI1 original edge voltages are very low, play a part of open-circuit-protection.11st controllable silicon SR11 is once triggered
Conducting, the voltage at the 11st controllable silicon SR11 two ends is approximately zero, then the 13rd diode D13 will forward bias and turn on,
15V direct current provides electric current by the 15th resistance R15 to the 11st controllable silicon SR11, so flows through the 11st controllable silicon
SR11's has two parts electric current, and a part is the output current of the single-phase LCL resonant networks of constant flow high pressure power supply, and a part is
The electric current that 15V direct currents are provided.Stop area when the output current of the single-phase LCL resonant networks of constant flow high pressure power supply enters, i.e.,
There is no output current, the still old electric currents of the 11st controllable silicon SR11 flow through, i.e., the electric current that 15V direct currents are provided, as long as this
Electric current is higher than the 11st controllable silicon SR11 maintenance electric current, and the 11st controllable silicon SR11 will be turned on, therefore suitably choose current limliting
Resistance is the 15th resistance R15 value, the output current of 15V direct currents is higher than the 11st controllable silicon SR11 maintenance electric current,
11st controllable silicon SR11 will constant conduction.The maintenance electric current of general controllable silicon chooses the tenth at 100 milliamperes or so
Five resistance R15 resistance makes 15V direct currents output current just can be so that the power consumption of circuit is also little higher than 100 milliamperes.Protection electricity
The inductance L11 of Lu Zhong 11 presence is extremely important, when taking away the 11st inductance L11, i.e., the 11st controllable silicon in Fig. 6
SR11 anode and the 4th single-phase rectification bridge BD4 positive pole are directly connected to, and experiment finds the 11st controllable silicon SR11 single-phase
The electric current of LCL resonant networks area of stopping can also be closed, and reason is that the electric current of single-phase LCL resonant networks output is far longer than 15V
The electric current of hundred milliamperes of ranks of direct current electricity output, the electric current of single-phase LCL resonant networks output develops from non-area of stopping to area of stopping
When, the rate of change of electric current is very big, that is, the rate of change for flowing through the 11st controllable silicon SR11 electric current is very big, the speed of current attenuation to zero
Degree is too fast, and this too high current attenuation speed equally closes the 11st controllable silicon SR11, can in order to prevent to flow through the 11st
The silicon SR11 too fast decay of electric current is controlled, is connected one the tenth between the 4th single-phase rectification bridge BD4 and the 11st controllable silicon SR11
One inductance L11, the characteristic of inductance is to hinder the change of electric current.After having added the 11st inductance L11, when open-circuit-protection is acted, i.e.,
Make the area of stopping for entering the electric current that single-phase LCL resonant networks are exported, due to more than 100 milliamperes of electric current for thering are 15V power supplys to come, the
11 controllable silicon SR11 continue to turn on, and protective current works on.The selection and the choosing of iron core of 11st inductance L11 inductance value
Take it is extremely important, the 11st inductance L11 inductance value than small 20 times of the first equivalent magnetizing inductances of duplex frequency boostering transformer TI1 with
On, such as the equivalent magnetizing inductance of the first duplex frequency boostering transformer TI1 is 10 milihenries, then the 11st inductance L11 value is less than
500 microhenrys, the selection of the 11st inductance L11 iron core also to allow inductance can store enough energy go to make to flow through the 11st it is controllable
The rate of decay of silicon SR11 electric currents lowers.
Embodiment three：
As shown in fig. 7, with reference to Fig. 6, a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit, including
Three-phase alternating current 380V voltage sources V2, it is connected on three-phase alternating current 380V voltage sources V2 by the 3rd inductance L3, the 4th inductance L4, the 5th
Inductance L5, the 6th inductance L6, the 7th inductance L7, the 8th inductance L8, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 compositions
Three-phase symmetrical LCL resonant networks, be connected on three-phase symmetrical LCL resonant networks three-phase main-frequency step-up transformer TYY1, even
The three-phase commutation bridge BD2 that is connected on three-phase main-frequency step-up transformer TYY1 secondary, second etc. be connected on three-phase commutation bridge BD2
Provided with control between effect load R2 and the 6th electric capacity C6, three-phase alternating current 380V voltage sources V2 and three-phase symmetrical the LCL resonant networks
3rd controllable silicon SR3 of electric power outputting current processed, the 4th controllable silicon SR4, the 5th controllable silicon SR5, the 6th controllable silicon SR6, the 7th
Controllable silicon SR7 and the 8th controllable silicon SR8, the three-phase main-frequency step-up transformer TYY1 primary side are connected with hardware open-circuit-protection electricity
Road.The hardware open loop protection circuit includes the 25th three-phase being connected in three-phase main-frequency step-up transformer TYY1 primary side
Rectifier bridge BD25, the 11st resistance R11 being connected on the 25th three-phase commutation bridge BD25 and the 11st electric capacity C11, company
It is connected on the 12nd resistance R12 and the 12nd electric capacity C12 on the 11st electric capacity C11, the electricity of the 11st electric capacity C11 and the 12nd
The first TVS diode Z1 and the second TVS diode Z2, one end and the tenth of the 11st electric capacity C11 are provided between resistance R12
It is provided with the 11st controllable silicon SR11 between two electric capacity C12 one end, the other end of the 12nd electric capacity C12 and the 11st controllable
The 13rd resistance R13 is provided between silicon SR11.The hardware open loop protection circuit also includes being connected to the 11st electric capacity C11 and the
The 11st inductance L11 between 11 controllable silicon SR11, be connected to three-phase alternating current 380V voltage sources V2 and the 11st inductance L11 it
Between the second protection circuit, second protection circuit includes being connected to the second power frequency liter on three-phase alternating current 380V voltage sources V2
Pressure transformer TI2, the 3rd single-phase rectification bridge BD3 for being connected to the second duplex frequency boostering transformer TI2 secondary, to be connected to the 3rd single-phase
The 14th resistance R14 and the 13rd electric capacity C13 on rectifier bridge BD3, the 13rd electric capacity C13 and the 11st inductance L11 it
Between be provided with the 15th resistance R15 and the 13rd diode D13.
Fig. 7 and Fig. 6 are not both uniquely the 4th single-phase rectification bridge that Fig. 6 is replaced with the 25th three-phase commutation bridge BD25
BD4, because three-phase main-frequency step-up transformer TYY1 primary side is three lines, wants all transformers of short circuit in open-circuit-protection
Primary side winding, it is necessary to which each primary side winding is all connected on rectifier bridge, therefore use the 25th three-phase commutation bridge BD25.Open
The course of work of road protection circuit with operation principle as Fig. 5 Fig. 6, when three-phase alternating current 380V voltage source V2 open runnings,
Three-phase main-frequency step-up transformer TYY1 original edge voltages are raised, then the 25th three-phase commutation bridge BD25 output voltages also increase, high
When rotection thresholds, the first TVS diode Z1 and the second TVS diode Z2 are by avalanche breakdown, the controllable silicon of triggering and conducting the 11st
SR11, the major part of the output current of three-phase symmetrical LCL resonant networks flows through from the 11st controllable silicon SR11, three-phase main-frequency boosting
Transformer TYY1 original edge voltages are very low, play a part of open-circuit-protection.
The present invention provides a kind of single phase industrial frequence constant flow high pressure power supply with hardware open loop protection circuit and a kind of with hard
The three-phase main-frequency constant flow high pressure power supply of part open loop protection circuit, can solve the problem that open-circuit-protection electricity in traditional power frequency constant flow high pressure power supply
The defect on road, realizes quick open-circuit-protection, improves the reliability of constant flow high pressure power supply.
Claims (6)
1. a kind of single phase industrial frequence constant flow high pressure power supply with hardware open loop protection circuit, it is characterised in that：Including single phase ac
380V voltage sources V1, the single-phase LCL resonant networks being made up of the first inductance L1, the first electric capacity C1 and the second inductance L2, it is connected to
The first duplex frequency boostering transformer TI1 on single-phase LCL resonant networks, be connected to the first duplex frequency boostering transformer TI1 secondary by
First single-phase rectification bridge BD1 of high voltage silicon rectifier stack composition, the first equivalent load R1 being connected on the first single-phase rectification bridge BD1, the
Two electric capacity C2, single phase ac 380V voltage sources V1 are additionally provided with the first of control electric power outputting current with single-phase LCL resonant networks can
Silicon SR1 and the second controllable silicon SR2 is controlled, the primary side of the first duplex frequency boostering transformer TI1 is connected with hardware open loop protection circuit.
2. a kind of single phase industrial frequence constant flow high pressure power supply with hardware open loop protection circuit according to claim 1, it is special
Levy and be：It is the 4th single-phase that the hardware open loop protection circuit includes being connected in the first duplex frequency boostering transformer TI1 primary side
Rectifier bridge BD4, the 11st resistance R11 being connected on the 4th single-phase rectification bridge BD4 and the 11st electric capacity C11, it is connected to the tenth
The 12nd resistance R12 and the 12nd electric capacity C12 on one electric capacity C11, the 11st electric capacity C11 and the 12nd resistance R12 it
Between one end and the 12nd electric capacity C12 provided with the first TVS diode Z1 and the second TVS diode Z2, the 11st electric capacity C11
One end between be provided with the 11st controllable silicon SR11, the other end and the 11st controllable silicon SR11 of the 12nd electric capacity C12 it
Between be provided with the 13rd resistance R13.
3. a kind of single phase industrial frequence constant flow high pressure power supply with hardware open loop protection circuit according to claim 2, it is special
Levy and be：The hardware open loop protection circuit also includes being connected between the 11st electric capacity C11 and the 11st controllable silicon SR11
11st inductance L11, the second protection circuit being connected between single phase ac 380V voltage sources V1 and the 11st inductance L11, institute
State the second protection circuit include be connected on single phase ac 380V voltage sources V1 the second duplex frequency boostering transformer TI2, be connected to
3rd single-phase rectification bridge BD3 of the second duplex frequency boostering transformer TI2 secondary, the tenth be connected on the 3rd single-phase rectification bridge BD3
The 15th resistance is provided between four resistance R14 and the 13rd electric capacity C13, the 13rd electric capacity C13 and the 11st inductance L11
R15 and the 13rd diode D13.
4. a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit, it is characterised in that：Including three-phase alternating current
380V voltage sources V2, be connected on three-phase alternating current 380V voltage sources V2 by the 3rd inductance L3, the 4th inductance L4, the 5th inductance L5,
6th inductance L6, the 7th inductance L7, the 8th inductance L8, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 compositions it is three relative
Claim LCL resonant networks, the three-phase main-frequency step-up transformer TYY1 being connected on three-phase symmetrical LCL resonant networks, be connected to three-phase
Three-phase commutation bridge BD2 on duplex frequency boostering transformer TYY1 secondary, the second equivalent load R2 being connected on three-phase commutation bridge BD2
With the 6th electric capacity C6, it is defeated provided with control power supply between three-phase alternating current 380V voltage sources V2 and three-phase symmetrical the LCL resonant networks
Go out the 3rd controllable silicon SR3, the 4th controllable silicon SR4, the 5th controllable silicon SR5, the 6th controllable silicon SR6, the 7th controllable silicon SR7 of electric current
With the 8th controllable silicon SR8, the primary side of the three-phase main-frequency step-up transformer TYY1 is connected with hardware open loop protection circuit.
5. a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit according to claim 4, it is special
Levy and be：The hardware open loop protection circuit includes the 25th be connected in three-phase main-frequency step-up transformer TYY1 primary side
Three-phase commutation bridge BD25, the 11st resistance R11 being connected on the 25th three-phase commutation bridge BD25 and the 11st electric capacity C11,
It is connected to the 12nd resistance R12 and the 12nd electric capacity C12 on the 11st electric capacity C11, the 11st electric capacity C11 and the 12nd
The first TVS diode Z1 and the second TVS diode Z2, one end and the tenth of the 11st electric capacity C11 are provided between resistance R12
It is provided with the 11st controllable silicon SR11 between two electric capacity C12 one end, the other end of the 12nd electric capacity C12 and the 11st controllable
The 13rd resistance R13 is provided between silicon SR11.
6. a kind of three-phase main-frequency constant flow high pressure power supply with hardware open loop protection circuit according to claim 5, it is special
Levy and be：The hardware open loop protection circuit also includes being connected between the 11st electric capacity C11 and the 11st controllable silicon SR11
11st inductance L11, the second protection circuit being connected between three-phase alternating current 380V voltage sources V2 and the 11st inductance L11, institute
State the second protection circuit include be connected on three-phase alternating current 380V voltage sources V2 the second duplex frequency boostering transformer TI2, be connected to
3rd single-phase rectification bridge BD3 of the second duplex frequency boostering transformer TI2 secondary, the tenth be connected on the 3rd single-phase rectification bridge BD3
The 15th resistance is provided between four resistance R14 and the 13rd electric capacity C13, the 13rd electric capacity C13 and the 11st inductance L11
R15 and the 13rd diode D13.
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