CN106877467A - A kind of discharge circuit and discharge control method - Google Patents
A kind of discharge circuit and discharge control method Download PDFInfo
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- CN106877467A CN106877467A CN201710114891.7A CN201710114891A CN106877467A CN 106877467 A CN106877467 A CN 106877467A CN 201710114891 A CN201710114891 A CN 201710114891A CN 106877467 A CN106877467 A CN 106877467A
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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- H02J7/027—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of discharge circuit and discharge control method, the discharge control method includes：Judge whether to meet discharging condition, if, then when each discharge cycle starts, obtain the discharge inception voltage in present discharge cycle, and judge the discharge inception voltage in present discharge cycle whether more than setting voltage, if, then the discharge inception voltage according to the present discharge cycle produces the pulse signal in present discharge cycle, wherein, produced pulse signal causes that the mean power of discharge resistance in release energy and the discharge cycle of discharge resistance in effective impulse discharge time is satisfied by the drop volume requirement of discharge resistance；To switching tube output pulse signal, with the break-make of controlling switch pipe, the discharging function in present discharge cycle is realized.Implement technical scheme, while the discharge circuit for ensureing DC charging module reliably discharges, can effectively shorten discharge time, while expanding discharge resistance type selecting scope, advantageously reduce device cost.
Description
Technical field
The present invention relates to DC charging field, more particularly to a kind of discharge circuit and discharge control method.
Background technology
In intelligent group's charging system, substantial amounts of DC charging module is equipped with, to realize exchange input turning to direct current
Change, for charging electric vehicle provides electric energy.According to Standard, the output voltage limit of some DC charging modules is higher,
Generally up to 750V.DC charging module can typically configure the filtering of certain capacity to reduce output ripple in its output port
Electric capacity.But, the filter condenser causes that the self discharge speed of port voltage is very slow when high pressure zero load shutdown is exported, and influences
To application of the DC charging module in intelligent charging system, special discharge circuit need to be designed to complete to be exported under specified operating mode
The rapid decrease of port voltage.
The major function of the discharge circuit of general DC charging module has at 2 points：
(1) when DC charging module departs from (be pulled out) from charging system, output port voltage should be rapidly reduced to set
Determine below voltage；
(2) the DC charging module in intelligent charging system should realize DC charging module position according to place system mode
Active discharge when in intelligent charging system, coordinates intelligent charging system to realize correlation function.
The conventional discharge circuit of current DC charging module using electric discharge as shown in figure 1, enable signal control discharge circuit
Whether act.When DC charging module is in system, it is low level that electric discharge enables signal, and switching tube S disconnects, discharge circuit
It is failure to actuate；When DC charging module departs from from system, it is high level, switching tube S conductings, discharge circuit that electric discharge enables signal
Action starts electric discharge.
Although the control of the discharge circuit is simple, the velocity of discharge is fast.But, because output voltage is higher, general direct current fills
During electric module output 750V, the energy stored on electric capacity C1 will bear larger during electric discharge up to 134 Jiao Er on discharge resistance R1
Electric current, and substantial amounts of heat accumulation is produced on discharge resistance R1.This discharge control mode has two shortcomings：
(1) it is discharge resistance R1 is born the heat accumulation produced by instantaneous large-current, it is necessary to select powerful resistance
Device, this means that the power resistor of high cost to be selected and large volume, or even also examines discharge resistance on Duct design
Including considering, the complexity of module design is increased indirectly；
(2) output electric discharge enables signal and controls by hardware electric discharge, only performs discharging action when module departs from from system,
The active discharge in output end in charging system cannot be realized, systemic-function is influenceed.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of discharge circuit and
Discharge control method.
The technical solution adopted for the present invention to solve the technical problems is：A kind of discharge control method is constructed, for passing through
Discharge resistance and switching tube carry out control of discharge to the voltage on filter capacitor, and the discharge resistance is connected with the switching tube
It is in parallel with the filter capacitor again afterwards, it is characterised in that including：
Step S10. judges whether to meet discharging condition, if so, then performing next step；
Step S20. obtains the discharge inception voltage in present discharge cycle when each discharge cycle starts, and judges to work as
Whether the discharge inception voltage of preceding discharge cycle is more than setting voltage, if so, then performing next step；
Step S30. produces the pulse signal in present discharge cycle according to the discharge inception voltage in present discharge cycle, its
In, produced pulse signal causes in effective impulse discharge time institute in release energy and the discharge cycle of the discharge resistance
The mean power for stating discharge resistance is satisfied by the drop volume requirement of the discharge resistance；
Step S40. exports the pulse signal to the switching tube, to control the break-make of the switching tube, realizes current
The discharging function of discharge cycle.
Preferably, the step S30 includes：
Discharge inception voltage according to the present discharge cycle obtains the currently active pulse discharge time, and according to pre-setting
The discharge cycle time and acquired the currently active pulse discharge time produce the pulse signal in present discharge cycle.
Preferably, the discharge inception voltage according to the present discharge cycle obtains the currently active pulse discharge time, specific bag
Include：
The currently active pulse discharge time is calculated according to formula 1：
Wherein, tonIt is the currently active pulse discharge time, R is the resistance of the discharge resistance, QRmaxIt is the electric discharge electricity
The maximum that can bear of resistance is released energy, kcIt is drop volume coefficient, VoIt is the discharge inception voltage in present discharge cycle.
Preferably, the discharge inception voltage according to the present discharge cycle obtains the currently active pulse discharge time, specific bag
Include：
Step S301. prestores discharge inception voltage array and effective impulse discharge time array, and, the electric discharge
Discharge inception voltage in starting voltage array is expired with the effective impulse discharge time in the effective impulse discharge time array
It is enough to lower relation：
Wherein, VoiBe the discharge inception voltage in the discharge inception voltage array, and the discharge inception voltage be from
What minimum discharge cut-off voltage was chosen between the ceiling voltage of electric discharge needed for, toniIt is the effective impulse discharge time array
In effective impulse discharge time, R is the resistance of the discharge resistance, QRmaxFor the maximum that the discharge resistance can bear is released
Energy, kcIt is drop volume coefficient；
Step S302. determines mesh according to the discharge inception voltage in present discharge cycle from the discharge inception voltage array
Mark discharge inception voltage, then determine from the effective impulse discharge time array with corresponding to the discharge target starting voltage
Target effective pulse discharge time, and using the target effective pulse discharge time as the currently active pulse discharge time,
Wherein, identified discharge target starting voltage is higher than the discharge inception voltage in present discharge cycle, and difference is minimum.
Preferably, the step S30 includes：
Discharge inception voltage according to the present discharge cycle obtains present discharge cycle time, and according to having for pre-setting
Effect pulse discharge time and acquired present discharge cycle time produce the pulse signal in present discharge cycle.
Preferably, the discharge inception voltage according to the present discharge cycle obtains present discharge cycle time, specifically includes：
Present discharge cycle time is calculated according to formula 2：
Wherein, T is present discharge cycle time, VoIt is the discharge inception voltage in present discharge cycle, R is the electric discharge electricity
The resistance of resistance, PeIt is the rated power of the discharge resistance, tonIt is effective impulse discharge time, kcIt is drop volume coefficient, k is advance
The peak-pulse power multiple that the discharge resistance can bear in the discharge cycle of determination.
Preferably, the discharge inception voltage according to the present discharge cycle obtains present discharge cycle time, specifically includes：
Step S303. prestores discharge inception voltage array and discharge cycle time array, and, the electric discharge starting
Discharge inception voltage in voltage array meets following relation with the discharge cycle time in the discharge cycle time array：
Wherein, VoiBe the discharge inception voltage in the discharge inception voltage array, and the discharge inception voltage be from
What minimum discharge cut-off voltage was chosen between the ceiling voltage of electric discharge needed for, TiPutting in for the discharge cycle time array
Electric cycle time, R is the resistance of the discharge resistance, PeIt is the rated power of the discharge resistance, tonFor effective impulse is discharged
Time, kcIt is drop volume coefficient, k is the peak-pulse power times that the discharge resistance can bear in predetermined discharge cycle
Number；
Step S304. determines mesh according to the discharge inception voltage in present discharge cycle from the discharge inception voltage array
Mark discharge inception voltage, then determine from the discharge cycle time array and the mesh corresponding to the discharge target starting voltage
The mark discharge cycle time, and using the discharge target cycle time as present discharge cycle time, wherein, identified target
Discharge inception voltage is higher than the discharge inception voltage in present discharge cycle, and difference is minimum.
Preferably, the step S40 includes：
Step S401. failure judgements flag bit whether set, if so, then performing step S410；If it is not, then performing step
S402；
Step S402. timers start timing；
Step S403. judges whether timing time reaches the effective impulse discharge time in present discharge cycle, if it is not, then holding
Row step S404；If so, then performing step S405；
Step S404. exports high level, is turned on controlling switch pipe, then performs step S403；
Step S405. exports low level, is turned off with controlling switch pipe；
Step S406. judges that timing time is to reach present discharge cycle time, if it is not, then performing step S405；If
It is then to perform step S407；
Step S407. timers reset；
Step S408. obtains the discharge inception voltage and discharge cut-off voltage in present discharge cycle, and judges present discharge
Whether the discharge cut-off voltage in cycle is more than preset value with the ratio of discharge inception voltage, if so, external high pressure then occurs continuing
The single failure of output port is applied to, step S409 is performed；If it is not, the step of then proceeding by next discharge cycle；
Fault flag described in step S409. set；
Step S410. stops electric discharge.
Preferably, in the step S30, produced pulse signal causes discharge resistance in effective impulse discharge time
Release energy and discharge cycle in the mean power of the discharge resistance be satisfied by the drop volume requirement of the discharge resistance, specifically
For：
Effective impulse discharge time and discharge cycle time meet following condition：
Wherein, Q is the energy of releasing of the discharge resistance in the currently active pulse discharge time, VoIt is the present discharge
The discharge inception voltage in cycle, R is the resistance of the discharge resistance, and τ is charge and discharge electrical time constant, and for the discharge resistance hinders
The product of value and filter capacitor capacitance, tonIt is the currently active pulse discharge time, T is present discharge cycle time, and P is currently to put
The mean power of discharge resistance in the electric cycle, k is that the discharge resistance can bear most in the predetermined present discharge cycle
Big pulse power multiple, kcIt is drop volume coefficient, PeIt is the rated power of the discharge resistance, QRmaxFor the discharge resistance can hold
The maximum received is released energy.
The present invention also constructs a kind of discharge circuit, is connected with filter capacitor, including discharge resistance, switching tube and controller,
Wherein, the first end of the discharge resistance connects the first end of the filter capacitor, the second end connection institute of the discharge resistance
The first end of switching tube is stated, the second end of the switching tube connects the second end of the filter capacitor；
The controller, for detect meet discharging condition when, when each discharge cycle starts, acquisition currently put
The discharge inception voltage in electric cycle, if the discharge inception voltage is more than setting voltage, produces according to the discharge inception voltage
The pulse signal in raw present discharge cycle, and the pulse signal is exported to the switching tube, to control the logical of the switching tube
It is disconnected, the discharging function in present discharge cycle is realized, wherein, produced pulse signal causes described in effective impulse discharge time
The mean power of the discharge resistance is satisfied by the drop volume of the discharge resistance in release energy and the discharge cycle of discharge resistance
It is required that.
Preferably, the controller, the electric discharge for being additionally operable to be obtained at the end of each discharge cycle the present discharge cycle cuts
Only voltage, if judging, the discharge cut-off voltage in present discharge cycle and the ratio of the discharge inception voltage in present discharge cycle are more than
, then there is external high pressure and be continuously applied single failure in output port in preset value, stop electric discharge.
Implement technical scheme, controller judge meet discharging condition when, according to putting for present discharge cycle
Electrical initiation voltage (such as the voltage of current the DC charging module output port for detecting) produces pulse signal, and the pulse signal
So that the mean power of discharge resistance is satisfied by release energy and the discharge cycle of discharge resistance in effective impulse discharge time
The drop volume requirement of discharge resistance, then, the pulse signal is exported to switching tube, with controlling switch pipe discontinuous conduction, it is to avoid electric discharge
The heat accumulation produced because bearing instantaneous large-current on resistance, it is ensured that while discharge circuit reliably discharges, can quickly reduce
Voltage on filter capacitor, while expanding discharge resistance type selecting scope, advantageously reduces device cost.In addition, this electric discharge
Circuit, can also be according to place system except in the case of applying when DC charging module departs from (be pulled out) from charging system
Demand realizes active discharge of the DC charging module in system, therefore extends the range of application of discharge circuit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.In accompanying drawing：
Fig. 1 is the circuit diagram of a kind of DC charging module output port filter capacitor of the prior art and discharge circuit；
Fig. 2 is the circuit diagram of DC charging module output port filter capacitor of the present invention and discharge circuit embodiment one；
Fig. 3 is the schematic diagram of pulse signal and DC charging module output port voltage in the present invention；
Fig. 4 is the flow chart of discharge control method embodiment one of the present invention；
Fig. 5 is the pulse power performance diagram of discharge resistance；
Fig. 6 is the schematic diagram of effective impulse discharge time and discharge inception voltage relation curve embodiment one；
Fig. 7 is the schematic diagram of effective impulse discharge time and discharge inception voltage relation curve embodiment two；
Fig. 8 is the voltage waveform of DC charging module output port embodiment one in discharge process under different voltage class
Figure；
Fig. 9 is the schematic diagram of discharge cycle time and discharge inception voltage relation curve embodiment one；
Figure 10 is the voltage waveform of DC charging module output port embodiment two in discharge process under different voltage class
Figure；
Figure 11 is the flow chart of step S40 embodiments one in Fig. 4.
Specific embodiment
Fig. 2 is the circuit diagram of output port filter capacitor of the present invention and discharge circuit embodiment one, the direct current of the embodiment
Charging module includes voltage conversion circuit (not shown), filter capacitor C1 and discharge circuit, wherein, voltage conversion circuit is used for will
Electric main is converted into direct current, and for electric automobile provides electric energy.Filter capacitor C1 is set in the output of DC charging module
Port, and for reducing the ripple of output voltage.Discharge circuit includes discharge resistance R1, switching tube S and controller U1.Its
In, discharge resistance R1 preferably has the necessarily power resistor with certain impact resistance, and the first end of discharge resistance R1 connects
Connect the first end of filter capacitor C1, the first end of the second end connecting valve pipe S of discharge resistance R1, second end of switching tube S connects
Connect second end of filter capacitor C1, the control end of controller U1 connecting valve pipes S, and, controller U1 be used for detecting it is full
During sufficient discharging condition, when each discharge cycle starts, obtain DC charging module output port voltage, and as work as
The discharge inception voltage V of preceding discharge cycleoIf the discharge inception voltage is more than setting voltage, according to the discharge inception voltage
The pulse signal in present discharge cycle is produced, and the pulse signal is exported to switching tube S, with the break-make of controlling switch pipe S, realized
The discharging function in present discharge cycle, specifically：When the pulse signal is high level, switching tube S conductings, discharge circuit starts
Electric discharge；When the pulse signal is low level, switching tube S shut-offs, discharge circuit stops electric discharge.And, produced pulse letter
Number cause effective impulse discharge time in discharge resistance R1 release energy and discharge cycle in discharge resistance R1 mean power
It is satisfied by the drop volume requirement of discharge resistance R1.
With reference to Fig. 3, the discharge cycle time of produced pulse signal is T, and effective impulse discharge time is ton, discharge arteries and veins
Interval time is rushed for toff, and T=ton+toff.Controller U1 to open the light pipe S output pulse signals when, t1Moment sends electricity high
Ordinary mail number, in effective impulse discharge time tonInterior switching tube S constant conductions, until t2Moment DC charging module output port
Voltage is by V0Drop to V1, now pulse signal low level is changed into from high level, switching tube S shut-offs, DC charging module output end
The voltage of mouth is in discharge pulse interval time toffInterior holding V1It is constant, until next discharge pulse arrives.
In this embodiment, produced pulse signal causes the energy of releasing of discharge resistance R1 in effective impulse discharge time
The mean power of discharge resistance R1 is satisfied by the drop volume requirement of discharge resistance in amount and discharge cycle, i.e. meet following two
Part：The maximum bearing ability of the energy no more than discharge resistance R1 of releasing of discharge resistance R1 in effective impulse discharge time；Electric discharge
Pulse power drop volume of the mean power of discharge resistance R1 no more than discharge resistance R1 in cycle.
In addition, the discharging condition of the embodiment for example includes：DC charging module departs from (be pulled out) from charging system
And the voltage of its output port is more than setting voltage；Or, DC charging module carries out active discharge according to charging system demand,
For example, system requirements module voltage reduces to complete certain specific function rapidly where the DC charging module.
By implementing the technical scheme of the embodiment, controller is detected when judging to meet discharging condition according to current
The voltage of DC charging module output port produce pulse signal, and the pulse signal causes to be put in effective impulse discharge time
The mean power of discharge resistance R1 is satisfied by the drop volume requirement of discharge resistance R1 in release energy and the discharge cycle of resistance R1,
Then, the pulse signal is exported to switching tube S, with controlling switch pipe S discontinuous conductions, can be avoided on discharge resistance R1 because bearing wink
Between high current and produced heat accumulation, and then can quickly reduce the voltage of DC charging module output port, therefore, ensureing
While the discharge circuit of DC charging module reliably discharges, can effectively shorten discharge time, while expanding discharge resistance choosing
Type scope, advantageously reduces device cost.In addition, this discharge circuit is except applying in DC charging module from charging system
Except in the case of when departing from (being pulled out), active release when can also realize that DC charging module is in place according to place charging system demand
Electricity, therefore extend the range of application of discharge circuit.
In a preferred embodiment, controller U1 is additionally operable at the end of each discharge cycle, obtain DC charging mould
The voltage of block output port, and as the discharge cut-off voltage in present discharge cycle, if judging putting for present discharge cycle
Electric blanking voltage is more than preset value with the ratio of the discharge inception voltage in present discharge cycle, then external high pressure occurs and is continuously applied
In the single failure of output port, stop electric discharge.
By implementing the technical scheme of the embodiment, examined because controller can also carry out failure at the end of discharge cycle
It is disconnected, the reliability of pulse discharge circuit can be effectively improved, it is to avoid the mistake cause thermal damage of discharge resistance R1.
Herein it should be noted that, above-described embodiment is to apply to be illustrated as a example by DC charging module by discharge circuit
, it should be appreciated that discharge circuit of the invention also can be applicable in other devices with filter capacitor, when needing to make filter capacitor
During voltage rapid decrease, the discharge circuit can be used to discharge filter capacitor.
Fig. 4 is the schematic flow sheet of discharge control method embodiment one of the present invention, and the control method is used for by the electricity that discharges
After resistance and switching tube carry out control of discharge to the voltage on filter capacitor, and discharge resistance is connected with switching tube again with filter capacitor
Parallel connection, the discharge control method of the embodiment is comprised the following steps：
Step S10. judges whether to meet discharging condition, if so, then performing next step；
Step S20. obtains the discharge inception voltage in present discharge cycle when each discharge cycle starts, and judges to work as
Whether the discharge inception voltage of preceding discharge cycle is more than setting voltage, if so, then performing next step；If it is not, then stopping electric discharge；
Step S30. produces the pulse signal in present discharge cycle according to the discharge inception voltage in present discharge cycle, its
In, produced pulse signal causes that electric discharge is electric in release energy and the discharge cycle of discharge resistance in effective impulse discharge time
The mean power of resistance is satisfied by the drop volume requirement of discharge resistance；
Step S40., with the break-make of controlling switch pipe, realizes putting for present discharge cycle to switching tube output pulse signal
Electricity Functional.
In a kind of optional embodiment, with reference to Fig. 2, the discharge inception voltage in present discharge cycle is obtained, can be to obtain
The voltage of cut-off current charge module output port, and as the discharge inception voltage in present discharge cycle.
In step s 30, produced pulse signal causes the energy of releasing of discharge resistance in effective impulse discharge time
And the mean power of discharge resistance is satisfied by the drop volume requirement of discharge resistance in discharge cycle, specially：
Effective impulse discharge time and discharge cycle time meet following condition：
Wherein, Q is the energy of releasing of discharge resistance in the currently active pulse discharge time, VoIt is putting for present discharge cycle
Electrical initiation voltage, R is the resistance of discharge resistance, and τ is charge and discharge electrical time constant, and is discharge resistance resistance and filter capacitor capacitance
Product, tonIt is the currently active pulse discharge time, T is present discharge cycle time, and P is discharge resistance in the present discharge cycle
Mean power, k is the peak-pulse power multiple that discharge resistance can bear in the predetermined present discharge cycle, kcIt is drop
Volume coefficient, PeIt is the rated power of discharge resistance, QRmaxFor the maximum that discharge resistance can bear is released energy.
On step S30, in one alternate embodiment, step S30 is specially：Obtain current according to discharge inception voltage
Effective impulse discharge time, and produced according to the discharge cycle time for pre-setting and acquired the currently active pulse discharge time
The pulse signal in raw present discharge cycle.In this embodiment, discharge cycle time T can join according to the hardware of DC charging module
Count (for example, the capacitance C of filter capacitor C1, resistance R of discharge resistance R1 etc.) to set, i.e. discharge cycle time T is fixed not
Become.And the effective impulse discharge time t in each discharge cycleonIt is to be set according to the voltage of DC charging module output port
, i.e. the discharge control method of the embodiment is the pulsed discharge control method for determining frequency self adaptation pulsewidth.Specifically, by ton
=F (Vo) obtain have in this discharge cycle with discharge inception voltage VoCorresponding effective impulse discharge time ton, to reach to not
Ad eundem port voltage carries out the purpose of repid discharge.
Implement the technical scheme of the embodiment, ensure discharge circuit reliability while, can within the most short time incite somebody to action
Output port voltage is discharged into below setting voltage.Simultaneously as the discharge inception voltage in each discharge cycle is inspection in real time
Survey, effective impulse discharge time is also real-time update in discharge cycle, with well adapting to property.
With reference to Fig. 2, if the capacity of filter capacitor C1 is C, the ceiling voltage of the DC charging module output port is Vmax,
The energy that then filter capacitor C1 is stored is reached as high as：
In electric discharge, the energy can only be released by discharge resistance R1 in the form of heat energy, therefore discharge resistance R1 mono-
As using with certain impact resistance power resistor.
It is assumed that the rated power of discharge resistance R1 is Pe, then the pulse power characteristic of discharge resistance that can be according to Fig. 5
Curve, design meets the pulsed discharge strategy that volume drops in discharge resistance R1.In Fig. 5, transverse axis t is the discharge pulse time, that is, discharge week
Time phase, longitudinal axis k is the peak-pulse power multiple that discharge resistance can bear in the discharge pulse t times.As seen from the figure, discharge arteries and veins
Rush that the time is shorter, the pulse power that discharge resistance can bear is bigger, but the energy released on discharge resistance in the discharge pulse time
Constant (i.e. k*Pe* t is constant), it is that maximum that discharge resistance can bear is released energy.
Pulse power characteristic curve according to discharge resistance, can calculate the maximum that discharge resistance in discharge process can bear
Release energy QRmax：
QRmax=kPe·t
For the discharge resistance R1 for having selected model, its maximum that can be born energy of releasing is fixed, i.e. QRmax
It is constant.External voltage V is likely to occur in view of DC charging moduleoThe fault condition in output port is continuously applied, at this
In determining frequency self adaptation width pulse discharge control method, in effective impulse discharge time t when need to ensure to occur the failureonInterior electric discharge
Resistance R1 is not damaged.If external voltage occur is continuously applied fault condition in DC charging module output port, now discharge
To determine the electric discharge of frequency self adaptation pulse width manner, then the energy for being consumed on discharge resistance R1 in single discharge cycle is circuit：
Discharge resistance R1 is taken with kcVolume drops in coefficient, then in this determines frequency self adaptation width pulse discharge control method, can count
Calculate the effective impulse discharge time t in each discharge cycleon：
That is there is external voltage and is continuously applied in the fault condition of output port in DC charging module, is in a short time
Make with effective impulse discharge time tonPulsed discharge is carried out, discharge resistance still meets energy and power deratng, will not guiding discharge
Resistance R1 is damaged.
After the model of discharge resistance R1 is selected, the maximum that the resistance R of discharge resistance R1, discharge resistance R1 can bear is released
Energy QRmaxAnd the drop volume coefficient k of discharge resistance R1cConstant is, then effective impulse discharge time tonWith electric discharge starting electricity
Pressure VoBetween be power function relationship, as shown in fig. 6, discharge inception voltage is higher, it is allowed to effective impulse discharge time it is shorter.
Even if simultaneously it can also be seen that discharge circuit constant conduction, the voltage of DC charging module output port can not still be dropped to quickly
0V, therefore, need to set a voltage in the discharge control method, when discharge inception voltage is not more than setting voltage, then stop
Only discharge, to avoid pulsed discharge Infinite Cyclic from going down.
When the currently active pulse discharge time is obtained according to the discharge inception voltage in present discharge cycle, there can be two kinds of realities
Existing mode, is specifically described below：
Implementation one：The currently active pulse discharge time is directly calculated according to formula.
In the implementation, the currently active pulse discharge time is calculated according to formula 1：
Wherein, tonIt is the currently active pulse discharge time, R is the resistance of discharge resistance R1, QRmaxFor discharge resistance R1 can
The maximum born is released energy, kcIt is drop volume coefficient, VoIt is the discharge inception voltage in present discharge cycle.
And, in implementation one, controller U1 is gone out using the microcontroller with very strong computing capability, Software for Design
Matched curve, i.e. ton=F (Vo), variable VoIt is the discharge inception voltage in detected present discharge cycle, F is above-mentioned formula 1
Shown power function, by detecting discharge inception voltage, Cycle by Cycle calculates the effective impulse discharge time in the present discharge cycle
ton。
Implementation two：Discharge inception voltage according to the present discharge cycle obtains the currently active pulse discharge time, tool
Body is comprised the following steps：
Step S301. prestores discharge inception voltage array and effective impulse discharge time array, and, electric discharge starting
Discharge inception voltage in voltage array is met with ShiShimonoseki with the effective impulse discharge time in effective impulse discharge time array
System：
Wherein, VoiIt is the discharge inception voltage in discharge inception voltage array, and discharge inception voltage is discharged from minimum
What blanking voltage was chosen between the ceiling voltage of electric discharge needed for, in the embodiment shown in Figure 2, the ceiling voltage of required electric discharge
Can be the ceiling voltage of DC charging module output port, toniFor the effective impulse in effective impulse discharge time array is put
The electric time；
Step S302. determines that target is put according to the discharge inception voltage in present discharge cycle from discharge inception voltage array
Electrical initiation voltage, then determine from effective impulse discharge time array and the target effective arteries and veins corresponding to discharge target starting voltage
The impulse electricity time, and using target effective pulse discharge time as the currently active pulse discharge time, wherein, identified target
Discharge inception voltage is higher than the discharge inception voltage in present discharge cycle, and difference is minimum.
In implementation two, array sequence, t are discretized into the power function shown in formula 1 firstoni=Fn (Voi), i
=1,2,3 ..., Fn is discretization array expression, and software first obtains detected discharge inception voltage, and Cycle by Cycle inquiry is current
Effective impulse discharge time in discharge cycle, can meet and maximum effectively arteries and veins is obtained according to the discharge inception voltage of current output
The impulse electricity time, shorten output discharge time, the computing of formula 1 is avoided that again, save the computing cost of controller.
When the currently active pulse discharge time is obtained according to the discharge inception voltage in present discharge cycle, above two reality
The difference of existing mode is only embodied in：The former is calculated t in real time using softwareon, the latter obtains t using software checking book methodon.Under
Text is only illustrated by taking implementation two as an example：
The exportable ceiling voltage of DC charging module is Vmax, minimum discharge cut-off voltage is Vend, can be in VmaxAnd Vend
Between choose x point, composition one discharge inception voltage array { Vmax, V1, V2..., Vx, when corresponding effective impulse is discharged
Between array be { ton0, ton1, ton2..., tonx}.Wherein, ton0It is with VmaxWhen being discharged for the effective impulse of discharge inception voltage
Between, tonxIt is with VxIt is the effective impulse discharge time of discharge inception voltage, and has：
Vmax＞ V1＞ V2＞ ... ＞ Vx＞ Vend
ton0＜ ton1＜ ton2＜ ... ＜ tonx
Obtain effective impulse discharge time array { ton0, ton1, ton2..., tonxAfterwards, it is necessary to correspondence discharge inception voltage
Array adjusts the energy and mean power released on discharge resistance in each discharge cycle.
For example, with the voltage of DC charging module output port as VxAs a example by, released on discharge resistance R1 in discharge cycle
Energy Q be：
The mean power P of discharge resistance is in discharge cycle：
In whole discharge process, the energy Q released on discharge resistance R1 in each discharge cycle is less than QRmax*kc, each
Mean power P in discharge cycle on discharge resistance R1 is less than k*Pe*kc。
When DC charging module meets discharging condition, controller obtains the electric discharge starting of DC charging module output port
Voltage class, and selecting more than or equal to the effective discharge pulse time corresponding to present discharge starting voltage, as currently putting
Effective discharge pulse time in the electric cycle, to ensure that discharge resistance will not overpower damage.
In a specific embodiment, it is assumed that the capacitance C of filter capacitor C1 is 475uF, discharge cycle T=0.2s, is put
The resistance R of resistance R1 is 440ohm, the rated power P of discharge resistance R1eIt is 12W, discharge resistance R1 can bear in 200ms
Peak-pulse power multiple k is 20, the drop volume coefficient k of discharge resistance R1c=0.8, then the maximum that discharge resistance R1 can bear is let out
Exoergic amount QRmaxFor：
QRmax=kPeT=20*12W*200ms=48J
In addition, the exportable ceiling voltage V of setting DC charging modulemaxIt is 750V, minimum discharge cut-off voltage takes Vend
It is 50V, in VmaxAnd VendBetween take 14 points (being spaced 50V) obtain discharge inception voltage array 750V, 700V,
650V ..., 100V }, the maximum that can be born according to discharge resistance R1 releases energy balane when obtaining corresponding effective impulse and discharging
Between array { 30ms, 34ms, 40ms ..., 200ms }.And, in this embodiment, discharge inception voltage discharges with effective impulse
The relation curve of time is as shown in Figure 7.
In addition, when discharge inception voltage is less than 291V, can be calculated now corresponding effective impulse by formula 1 and put
Electric time tonWhen being more than discharge cycle time T, i.e. discharge inception voltage less than 291V, even if carrying out arteries and veins with 100% dutycycle
Impulse electricity, also will not the damage of guiding discharge resistance R1 overpowers.
In addition, also needing to the effective impulse discharge time in the effective impulse discharge time array that is calculated and discharging
Beginning voltage carries out release energy and mean power accounting.
The energy released on discharge resistance R1 in first discharge cycle is：
The mean power of discharge resistance is in first discharge cycle：
Similarly, the effective impulse discharge time that can calculate all discharge cycles in the example is satisfied by discharge resistance R1
Drop volume requirement.
Port voltage when if DC charging module meets discharging condition is 750V, by retrieving discharge inception voltage number
Group, can obtain the effective impulse discharge time in first discharge cycle for ton0It is 30ms, and it is all as first electric discharge using the time
The effective impulse discharge time of phase.Discharge inception voltage when second discharge cycle arrives is 649.598V (first electric discharges
Discharge cut-off voltage during end cycle), by retrieving discharge inception voltage array, V3(600V)<649.598V<V2
(650V), big principle is taken according to voltage, can obtain the effective impulse discharge time in second discharge cycle for 40ms, and with this
Time is used as second effective impulse discharge time of discharge cycle.Similarly can obtain discharge inception voltage in each discharge cycle
Corresponding effective impulse discharge time.
Port voltage when discharging condition is met to DC charging module is that the process of pulse discharge of 620V is similar to above,
Here repeat no more.
Determine frequency self adaptation width pulse discharge control method using described in the embodiment, be to output port voltage respectively
750V and 620V carries out control of discharge, and the voltage waveform of DC charging module output port is as shown in Figure 8.
Using the pulsed discharge control method for determining frequency self adaptation pulsewidth, can be in each discharge cycle according to DC charging mould
The discharge inception voltage of block output port, it is (or real by retrieving discharge inception voltage array and effective impulse discharge time array
When calculate), you can obtain the effective impulse discharge time in the present discharge cycle.
On step S30, in one alternate embodiment, step S30 is specially：Electric discharge according to the present discharge cycle rises
Beginning voltage obtains present discharge cycle time, and according to the effective impulse discharge time and acquired present discharge for pre-setting
Cycle time produces the pulse signal in present discharge cycle.In this embodiment, effective impulse discharge time tonCan be according to direct current
The most bad working environments of charging module output maximum voltage are designed, i.e. effective impulse discharge time tonImmobilize.And discharge week
Time phase T is set according to the voltage of DC charging module output port, i.e. the discharge control method of the embodiment is to determine pulsewidth
The pulsed discharge control method in self adaptation cycle.Specifically, by T=f (Vo), obtain and discharge inception voltage VoIt is corresponding to put
Electric cycle time, the purpose of repid discharge is carried out to different brackets port voltage to reach.
Implement the technical scheme of the embodiment, ensure discharge circuit reliability while, can within the most short time incite somebody to action
Output port voltage is discharged into below setting voltage.Simultaneously as the discharge inception voltage real-time detection in each discharge cycle,
Discharge cycle time also real-time update, with well adapting to property.
With reference to Fig. 2, if the capacity of filter capacitor C1 is C, the ceiling voltage of the DC charging module output port is Vmax,
The resistance of discharge resistance R1 is R, and the rated power of discharge resistance R1 is Pe, obtaining discharge resistance R1 according to Fig. 5 can bear most
Big energy of releasing is for QRmax, the drop volume coefficient of discharge resistance is kc.Outside ceiling voltage is likely to occur in view of DC charging module
VmaxThe fault condition in output port is continuously applied, in the pulsed discharge control method for determining the pulsewidth self adaptation cycle, needs to ensure
Discharge resistance R1 is not damaged in each discharge cycle when there is the failure.Filled in direct current if external high pressure occur and being continuously applied
The fault condition of electric module output port, now to determine pulse width manner electric discharge, then single discharge cycle is interior in electric discharge for discharge circuit
The energy consumed on resistance R1 is constant：
Discharge cycle time T now need to ensure that ohmically mean power meets drop volume requirement.Take in discharge cycle and put
The peak-pulse power multiple that resistance can bear is k, then have：
That is,
When present discharge cycle time is obtained according to the discharge inception voltage in present discharge cycle, there can be two kinds of realization sides
Formula, is specifically described below：
Implementation one：Present discharge cycle time is directly calculated according to formula.
In the implementation, present discharge cycle time is calculated according to formula 2：
Wherein, T is present discharge cycle time, VoIt is the discharge inception voltage in present discharge cycle, R is discharge resistance R1
Resistance, PeIt is the rated power of discharge resistance R1, tonIt is effective impulse discharge time, kcIt is drop volume coefficient, k is predetermined
Discharge cycle in the peak-pulse power multiple that can bear of discharge resistance, herein it should be noted that, it is determined that during k, first estimating
One discharge cycle time, and the discharge cycle time estimated according to this determine corresponding k values, then by discharge cycle discharge
The discharge cycle time and its corresponding k values estimated constantly are corrected in the accounting of the energy and mean power released on resistance, make
The discharge cycle time that the discharge cycle time estimated is calculated closest to formula 2.
And, in implementation one, controller U1 is gone out using the microcontroller with stronger computing capability, Software for Design
Matched curve, i.e. T=F (Vo), variable VoIt is the discharge inception voltage in detected present discharge cycle, F is the institute of above-mentioned formula 2
Show power function, by detecting discharge inception voltage, Cycle by Cycle calculates present discharge cycle time；
Implementation two：Discharge inception voltage according to the present discharge cycle obtains present discharge cycle time, specific bag
Include following steps：
Step S303. prestores discharge inception voltage array and discharge cycle time array, and, discharge inception voltage
Discharge inception voltage in array meets following relation with the discharge cycle time in discharge cycle time array：
Wherein, VoiIt is the discharge inception voltage in discharge inception voltage array, and discharge inception voltage is discharged from minimum
What blanking voltage was chosen between the ceiling voltage of electric discharge needed for, in the embodiment shown in Figure 2, the ceiling voltage of required electric discharge
Can be the ceiling voltage of DC charging module output port, TiIt is the discharge cycle time in discharge cycle time array；
Step S304. determines that target is put according to the discharge inception voltage in present discharge cycle from discharge inception voltage array
Electrical initiation voltage, then from discharge cycle time array determine with discharge target starting voltage corresponding to the discharge target cycle when
Between, and using discharge target cycle time as present discharge cycle time, wherein, identified discharge target starting voltage is higher than
The discharge inception voltage in present discharge cycle, and difference is minimum.
In two kinds of implementation, array sequence, T are discretized into power function curve shown in formula 2 firsti=Fn (Voi), i
=1,2,3 ..., Fn is discretization array expression, and software first obtains detected discharge inception voltage, and Cycle by Cycle inquiry is current
The discharge cycle time corresponding to discharge cycle, can meet and maximum effectively arteries and veins is obtained according to the discharge inception voltage of current output
The impulse electricity time, shorten output discharge time；The computing of formula 2 is avoided that again, saves the computing cost of controller.
When present discharge cycle time is obtained according to the discharge inception voltage in present discharge cycle, above two realization side
The difference of formula is only embodied in：The former is calculated T in real time using software, and the latter obtains T using software checking book method, no longer same hereinafter
When repeat, hereafter only illustrated by taking implementation two as an example：
The exportable ceiling voltage of DC charging module is Vmax, minimum discharge cut-off voltage is Vend, can be in VmaxAnd Vend
Between choose x point, constitute one and discharge inception voltage array { Vmax, V1, V2..., Vx, the corresponding discharge cycle time
Array is { T0, T1, T2..., Tx}.Wherein, T0It is with VmaxIt is the discharge cycle time of discharge inception voltage, TxIt is with VxTo put
The discharge cycle time of electrical initiation voltage, and have：
Vmax＞ V1＞ V2＞ ... ＞ Vx＞ Vend
T0＞ T1＞ T2＞ ... ＞ Tx
So far, just can obtain pulsed discharge cycle time array { T corresponding with discharge inception voltage array0, T1,
T2..., Tx}.Then, in addition it is also necessary to which correspondence discharge inception voltage array adjusts the energy released on discharge resistance in each discharge cycle
Amount and mean power.
For example, with the voltage of DC charging module output port as VxAs a example by, released on discharge resistance R1 in discharge cycle
Energy Q be：
The mean power P of discharge resistance is in discharge cycle：
In whole discharge process, the energy and mean power released on discharge resistance R1 in each discharge cycle are intended to full
Foot drop volume requirement.
When DC charging module meets discharging condition, controller obtains the electric discharge starting of DC charging module output port
Voltage class, and select, more than or equal to the discharge cycle time corresponding to present discharge starting voltage, to be put as this subpulse
The discharge cycle time of electricity, to ensure that discharge resistance will not overpower damage.
In a specific embodiment, it is assumed that the capacitance C of DC charging module outlet side filter capacitor C1 is 475uF,
The resistance R of discharge resistance R1 is 440ohm, the rated power P of discharge resistance R1eIt is 12W, the drop volume coefficient k of discharge resistance R1cFor
0.8, tentatively take the peak-pulse power multiple k=20 that discharge resistance R can bear in 200ms, then resistance can in discharge process
The maximum born is released energy QRmaxFor：
QRmax=kPeT=20*12W*200ms=48J
Put with the effective impulse in the most bad working environments design pulsed discharge cycle of DC charging module output maximum voltage
Electric time ton, then have：
Then determine pulsewidth self adaptation recurrent pulse discharge control method in the embodiment, effective impulse discharge time is set
It is calculated as 30ms, and design and the one-to-one discharge cycle time array of discharge inception voltage array on this basis.
In addition, the exportable ceiling voltage V of setting DC charging modulemaxIt is 750V, minimum pulse discharge cut-off voltage takes
VendIt is 50V, in VmaxAnd VendBetween take 14 points (being spaced 50V) obtain discharge inception voltage array 750V, 700V,
650V ..., 100V }, the maximum that can be born according to discharge resistance R1 energy balane of releasing obtains corresponding discharge cycle time number
Group is { 200ms, 174ms, 150ms ..., 30ms }.And, in this embodiment, discharge inception voltage and discharge cycle time
Relation curve it is as shown in Figure 9.
In addition, when discharge inception voltage is less than 291V, the discharge cycle time being calculated puts less than effective impulse
When electric time, i.e. discharge inception voltage are less than 291V, even if carrying out pulsed discharge with 100% dutycycle, also will not guiding discharge
Resistance overpower is damaged.
Now, also need to enter the discharge cycle time in the discharge cycle time array that is calculated and discharge inception voltage
Mean power is adjusted.Mean power P in discharge cycle on discharge resistance R10For：
Similarly, can calculate when discharge inception voltage is higher than 291V, electric discharge in the discharge cycle time being calculated
Ohmically mean power is 166.691W, is satisfied by the power deratng requirement of discharge resistance R1.
Port voltage when if module meets discharging condition is 750V, by retrieving discharge inception voltage array, can obtain
To first discharge cycle time T0It is 200ms, and using the time as the first discharge cycle time.Second discharge cycle arrives
When discharge inception voltage be 649.598V (discharge cut-off voltage at the end of first discharge cycle), by retrieval discharge
Knowable to beginning voltage array, V3(600V)<649.598V<V2(650V), big principle is taken according to voltage, can be obtained second pulse and be put
Electric cycle time is 150ms, and using the time as the second discharge cycle time.Similarly can obtain and discharge inception voltage pair
The discharge cycle time answered.
Port voltage when discharging condition is met to DC charging module is that the process of pulse discharge of 620V is similar to above,
Here repeat no more.
Pulsewidth self adaptation recurrent pulse discharge control method is determined using the embodiment, the voltage to output port is respectively
The voltage waveform that output port during control of discharge is carried out during 750V and 620V is as shown in Figure 10.
Using the pulsed discharge control method for determining the pulsewidth self adaptation cycle, in the premise that effective impulse discharge time is fixed
Under, can be when each discharge cycle starts, according to discharge inception voltage, by retrieving discharge inception voltage array and discharge cycle
Time array (or calculating in real time), you can obtain the discharge cycle time in present discharge cycle, make discharge resistance in discharge cycle
Interior mean power is equal, while reliability is ensured, improves discharge resistance utilization rate, by output port electricity within the shortest time
Pressure is dropped to below safe voltage.
On step S40, in one alternate embodiment, with reference to Figure 11, step S40 specifically includes following steps：
Step S401. failure judgements flag bit whether set, if so, then performing step S410；If it is not, then performing step
S402；
Step S402. timers start timing；
Step S403. judges whether timing time reaches the effective impulse discharge time in present discharge cycle, if it is not, then holding
Row step S404；If so, then performing step S405；
Step S404. exports high level, is turned on controlling switch pipe, then performs step S403；
Step S405. exports low level, is turned off with controlling switch pipe；
Step S406. judges that timing time is to reach present discharge cycle time, if it is not, then performing step S405；If
It is then to perform step S407；
Step S407. timers reset；
Step S408. obtains the discharge inception voltage and discharge cut-off voltage in present discharge cycle, and judges present discharge
Whether the discharge cut-off voltage in cycle is more than preset value with the ratio of discharge inception voltage, if so, external high pressure then occurs continuing
The single failure of output port is applied to, step S409 is performed；If it is not, the step of then proceeding by next discharge cycle；
Step S409. set fault flags；
Step S410. stops electric discharge.
On the preset value in step S408, herein it should be noted that：
When external high pressure occurs in DC charging module is continuously applied the single failure in its output port, even if output end
Mouthful discharge circuit by a discharge cycle, the voltage of its output port remains in that constant, expected output end does not occur
The situation that mouth voltage declines, then can determine whether that now DC charging module there occurs that external high pressure is continuously applied the list in output port
One failure, should now forbid discharge circuit to act.
When the output port of DC charging module is in regular picture, in effective impulse discharge time tonIt is interior, DC charging
The voltage of the output port of module is gradually decreased under V1 (discharge cut-off voltage), and both satisfactions by V0 (discharge inception voltage)
Formula relation：
From above formula, in discharge cycle, discharge cut-off voltage is put with the ratio of discharge inception voltage with effective impulse
Electric time tonIt is relevant, tonTime is more long, then discharge cut-off voltage is smaller with the ratio of discharge inception voltage.
For the pulse signal for determining frequency self adaptation pulsewidth, the effective impulse discharge time t in first discharge cycleonIt is most short,
Discharge pulse blanking voltage is also maximum with the ratio of discharge pulse starting voltage, such as in above-described embodiment in first discharge cycle
The ratio of discharge cut-off voltage and discharge inception voltage be 0.866, with the increase of discharge cycle number, the ratio gradually subtracts
It is small.Therefore, in this case, can be set with the maximum of discharge inception voltage ratio according to discharge cut-off voltage in discharge process
The preset value of electric fault detection is put, for example, can be set to 0.9.
For the pulse signal for determining the pulsewidth self adaptation cycle, due to effective impulse discharge time tonImmobilize, for example, go up
State effective impulse discharge time t in embodimentonIt is fixed as in 30ms, therefore whole discharge process, electric discharge in each discharge cycle
Blanking voltage also immobilizes with the ratio of discharge inception voltage, is 0.866, therefore, in this case, can directly with reference to putting
Electric blanking voltage sets the preset value of discharge fault detection with the ratio of discharge inception voltage, for example, can be set to 0.866.
If kfFor the preset value that set discharge fault is detected.At the end of each discharge cycle, by the discharge cycle
Discharge cut-off voltage and discharge inception voltage be compared, if discharge cut-off voltage more than discharge inception voltage kfTimes when,
Then can determine whether that now DC charging module there occurs that external high pressure is continuously applied the single failure in output port, you can think straight
Current charge module there occurs electric discharge failure of removal, and the pulsed discharge of next discharge cycle is forbidden in correlating markings set.In addition, also
It should be noted that, the fault detection logic is performed in being nested in control of discharge.
In a specific embodiment, according to the circuit parameter shown in above-described embodiment, DC charging module occurs outer
Portion's high pressure is continuously applied in the failure of output port, by first effective impulse discharge time tonAfterwards, DC charging module is defeated
The voltage of exit port still keeps 750V constant, and within first effective impulse discharge time, the energy released on discharge resistance R1 is：
Take the drop volume coefficient k of discharge resistance R1c=0.8, the mean power P on discharge resistance R11For：
Even if DC charging module occurs the single failure that external high pressure is continuously applied, DC charging module uses above-mentioned reality
When applying the discharge control method of example and carrying out control of discharge to the voltage of DC charging module output port, in first discharge cycle still
Meet the drop volume requirement of discharge resistance R1, as long as therefore can failure judgement in time generation, discharge resistance is just without risk.
The fault detection method of above-described embodiment is applied to the occasion of all use pulsed discharges control, can effectively improve arteries and veins
The reliability of impulse electricity circuit, it is to avoid discharge resistance crosses cause thermal damage.
In addition, the application scenario of above-mentioned discharge control method is not limited merely to DC charging module, this area is related to
The application scenario of filter capacitor electric discharge, discharge control method of the present invention is all adapted to.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All any buns within the spirit and principles in the present invention, made
Change, equivalent, improvement etc., should be included within scope of the presently claimed invention.
Claims (11)
1. a kind of discharge control method, for carrying out electric discharge control to the voltage on filter capacitor by discharge resistance and switching tube
System, and it is in parallel with the filter capacitor again after the discharge resistance is connected with the switching tube, it is characterised in that including：
Step S10. judges whether to meet discharging condition, if so, then performing next step；
Step S20. obtains the discharge inception voltage in present discharge cycle when each discharge cycle starts, and judgement is currently put
Whether the discharge inception voltage in electric cycle is more than setting voltage, if so, then performing next step；
Step S30. produces the pulse signal in present discharge cycle according to the discharge inception voltage in present discharge cycle, wherein, institute
The pulse signal of generation causes described in release energy and the discharge cycle of the discharge resistance in effective impulse discharge time putting
The mean power of resistance is satisfied by the drop volume requirement of the discharge resistance；
Step S40. exports the pulse signal to the switching tube, to control the break-make of the switching tube, realizes present discharge
The discharging function in cycle.
2. discharge control method according to claim 1, it is characterised in that the step S30 includes：
Discharge inception voltage according to the present discharge cycle obtains the currently active pulse discharge time, and according to putting for pre-setting
Electric cycle time and acquired the currently active pulse discharge time produce the pulse signal in present discharge cycle.
3. discharge control method according to claim 2, it is characterised in that the electric discharge starting electricity according to the present discharge cycle
Pressure obtains the currently active pulse discharge time, specifically includes：
The currently active pulse discharge time is calculated according to formula 1：
Wherein, tonIt is the currently active pulse discharge time, R is the resistance of the discharge resistance, QRmaxFor the discharge resistance can
The maximum born is released energy, kcIt is drop volume coefficient, VoIt is the discharge inception voltage in present discharge cycle.
4. discharge control method according to claim 2, it is characterised in that the electric discharge starting electricity according to the present discharge cycle
Pressure obtains the currently active pulse discharge time, specifically includes：
Step S301. prestores discharge inception voltage array and effective impulse discharge time array, and, the electric discharge starting
Effective impulse discharge time in discharge inception voltage in voltage array and the effective impulse discharge time array meet with
Lower relation：
Wherein, VoiIt is the discharge inception voltage in the discharge inception voltage array, and the discharge inception voltage is from minimum
What discharge cut-off voltage was chosen between the ceiling voltage of electric discharge needed for, toniFor in the effective impulse discharge time array
Effective impulse discharge time, R is the resistance of the discharge resistance, QRmaxFor the maximum that the discharge resistance can bear is released energy
Amount, kcIt is drop volume coefficient；
Step S302. determines that target is put according to the discharge inception voltage in present discharge cycle from the discharge inception voltage array
Electrical initiation voltage, then determine from the effective impulse discharge time array and the mesh corresponding to the discharge target starting voltage
Effect pulse discharge time is indicated, and using the target effective pulse discharge time as the currently active pulse discharge time, wherein,
Identified discharge target starting voltage is higher than the discharge inception voltage in present discharge cycle, and difference is minimum.
5. discharge control method according to claim 1, it is characterised in that the step S30 includes：
Discharge inception voltage according to the present discharge cycle obtains present discharge cycle time, and according to the effective arteries and veins for pre-setting
Impulse electricity time and acquired present discharge cycle time produce the pulse signal in present discharge cycle.
6. discharge control method according to claim 5, it is characterised in that the electric discharge starting electricity according to the present discharge cycle
Pressure obtains present discharge cycle time, specifically includes：
Present discharge cycle time is calculated according to formula 2：
Wherein, T is present discharge cycle time, VoIt is the discharge inception voltage in present discharge cycle, R is the discharge resistance
Resistance, PeIt is the rated power of the discharge resistance, tonIt is effective impulse discharge time, kcIt is drop volume coefficient, k is predetermined
Discharge cycle in the peak-pulse power multiple that can bear of the discharge resistance.
7. discharge control method according to claim 5, it is characterised in that the electric discharge starting electricity according to the present discharge cycle
Pressure obtains present discharge cycle time, specifically includes：
Step S303. prestores discharge inception voltage array and discharge cycle time array, and, the discharge inception voltage
Discharge inception voltage in array meets following relation with the discharge cycle time in the discharge cycle time array：
Wherein, VoiIt is the discharge inception voltage in the discharge inception voltage array, and the discharge inception voltage is from minimum
What discharge cut-off voltage was chosen between the ceiling voltage of electric discharge needed for, TiIt is the electric discharge week in the discharge cycle time array
Time phase, R is the resistance of the discharge resistance, PeIt is the rated power of the discharge resistance, tonIt is effective impulse discharge time,
kcIt is drop volume coefficient, k is the peak-pulse power multiple that the discharge resistance can bear in predetermined discharge cycle；
Step S304. determines that target is put according to the discharge inception voltage in present discharge cycle from the discharge inception voltage array
Electrical initiation voltage, then determine to be put with the target corresponding to the discharge target starting voltage from the discharge cycle time array
Electric cycle time, and using the discharge target cycle time as present discharge cycle time, wherein, identified discharge target
Starting voltage is higher than the discharge inception voltage in present discharge cycle, and difference is minimum.
8. the discharge control method according to claim any one of 1-7, it is characterised in that the step S40 includes：
Step S401. failure judgements flag bit whether set, if so, then performing step S410；If it is not, then performing step S402；
Step S402. timers start timing；
Step S403. judges whether timing time reaches the effective impulse discharge time in present discharge cycle, if it is not, then performing step
Rapid S404；If so, then performing step S405；
Step S404. exports high level, is turned on controlling switch pipe, then performs step S403；
Step S405. exports low level, is turned off with controlling switch pipe；
Step S406. judges that timing time is to reach present discharge cycle time, if it is not, then performing step S405；If so, then
Perform step S407；
Step S407. timers reset；
Step S408. obtains the discharge inception voltage and discharge cut-off voltage in present discharge cycle, and judges the present discharge cycle
The ratio of discharge cut-off voltage and discharge inception voltage whether be more than preset value, if so, external high pressure then occurs being continuously applied
In the single failure of output port, step S409 is performed；If it is not, the step of then proceeding by next discharge cycle；
Fault flag described in step S409. set；
Step S410. stops electric discharge.
9. discharge control method according to claim 1, it is characterised in that in the step S30, produced pulse
Signal causes the average work(of the discharge resistance in release energy and the discharge cycle of discharge resistance in effective impulse discharge time
Rate is satisfied by the drop volume requirement of the discharge resistance, specially：
Effective impulse discharge time and discharge cycle time meet following condition：
Wherein, Q is the energy of releasing of the discharge resistance in the currently active pulse discharge time, VoIt is the present discharge cycle
Discharge inception voltage, R is the resistance of the discharge resistance, and τ is charge and discharge electrical time constant, and for the discharge resistance resistance with
The product of filter capacitor capacitance, tonIt is the currently active pulse discharge time, T is present discharge cycle time, and P is present discharge week
The mean power of discharge resistance in phase, k is the maximum arteries and veins that the discharge resistance can bear in the predetermined present discharge cycle
Rush power multiple, kcIt is drop volume coefficient, PeIt is the rated power of the discharge resistance, QRmaxThe discharge resistance can bear
Maximum is released energy.
10. a kind of discharge circuit, is connected with filter capacitor, it is characterised in that including discharge resistance, switching tube and controller, its
In, the first end of the discharge resistance connects the first end of the filter capacitor, and the second end connection of the discharge resistance is described
The first end of switching tube, the second end of the switching tube connects the second end of the filter capacitor；
The controller, for detect meet discharging condition when, when each discharge cycle starts, obtain present discharge week
The discharge inception voltage of phase, if the discharge inception voltage is more than setting voltage, produces according to the discharge inception voltage and works as
The pulse signal of preceding discharge cycle, and the pulse signal is exported to the switching tube, it is real to control the break-make of the switching tube
The discharging function in existing present discharge cycle, wherein, produced pulse signal causes the electric discharge in effective impulse discharge time
The mean power of the discharge resistance is satisfied by the drop volume requirement of the discharge resistance in release energy and the discharge cycle of resistance.
11. discharge circuits according to claim 10, it is characterised in that
The controller, is additionally operable to be obtained at the end of each discharge cycle the discharge cut-off voltage in present discharge cycle, if sentencing
The discharge cut-off voltage in disconnected present discharge cycle is more than preset value with the ratio of the discharge inception voltage in present discharge cycle, then send out
Raw external high pressure is continuously applied the single failure in output port, stops electric discharge.
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| CN107491137A (en) * | 2017-09-29 | 2017-12-19 | 特变电工西安电气科技有限公司 | A kind of variable step constant speed drop volume limit power MPPT perturbation motion methods |
| CN108199577A (en) * | 2017-12-21 | 2018-06-22 | 重庆菲力斯特科技有限公司 | DC high-voltage power supply decompression control device, method and DC high-voltage power supply dropping equipment |
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| CN112332820A (en) * | 2020-11-16 | 2021-02-05 | 合肥科威尔电源系统股份有限公司 | Control circuit for testing power supply discharge resistance and control method thereof |
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Application publication date: 20170620 Assignee: Xi'an teride lingchong New Energy Technology Co.,Ltd. Assignor: Xi'an TGOOD Intelligent Charging Technology Co.,Ltd. Contract record no.: X2020370010026 Denomination of invention: A discharge circuit and discharge control method Granted publication date: 20200619 License type: Common License Record date: 20201130 |
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