CN108448663A - A kind of pure direct-flow storage battery Electrical Discharge Machine - Google Patents
A kind of pure direct-flow storage battery Electrical Discharge Machine Download PDFInfo
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- CN108448663A CN108448663A CN201810136658.3A CN201810136658A CN108448663A CN 108448663 A CN108448663 A CN 108448663A CN 201810136658 A CN201810136658 A CN 201810136658A CN 108448663 A CN108448663 A CN 108448663A
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- current
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- accurate adjustment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H02J7/0022—
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Abstract
The invention discloses a kind of pure direct-flow storage battery Electrical Discharge Machines, include the current transformer of connection accumulator group；Connect the π type filter circuits of the current transformer；Connect the choke coil of described π types filter circuit one end；Connect the accurate adjustment load of the π types filter circuit other end；At least one set of definite value load of the current transformer is connected, each definite value load is controlled by switching device；Connect the CPU module of the switching device；The PWM control modules of the CPU module are connected, the PWM control modules connect the accurate adjustment load.The present invention solves the problems, such as that negative peak and harmonic wave damage accumulator group, has higher safety compared with traditional Electrical Discharge Machine；Using pwm pulse technology accurate adjustment electric current, ripple current component is eliminated after choke coil combination π type filter circuits filter negative peak and harmonic wave, high precision constant current electric discharge is realized, there is higher science.
Description
Technical field
The present invention relates to and transformer station direct current system field more particularly to a kind of pure direct-flow storage battery Electrical Discharge Machine.
Background technology
Accumulator group in straight-flow system as stand-by power supply can be provided for electrical secondary system load in electric system safety,
Stable, reliable electric power safeguard.It is a routine to carry out core discharge capacitor to accumulator in the line service of straight-flow system
Maintenance work, need in principle use accurate constant-current discharge.All it is at present to be carried out using Electrical Discharge Machine to the electric discharge of accumulator
Electric discharge, but there are many problems for the realization technology of traditional Electrical Discharge Machine, it may appear that accumulator carries out electric power storage after core discharge capacitor
The capacity in pond declines, and the case where battery malfunction occurs after multiple core discharge capacitor.Even there is other day accumulator core and holds capacity
Meet requirement, exchange, which has a power failure, after a few days has been found that the case where battery malfunction leads to power outage.
Discharge voltage/the current waveform for testing different Electrical Discharge Machines is analyzed, it is found that the Electrical Discharge Machine of most domestic exists
Following problem：
(1) discharge current pulsating current is very big, and measuring accuracy is inaccurate.
(2) higher inverse peak voltage is formed on accumulator, zigzag is presented in the waveform on accumulator, influences accumulator
Performance.
(3) ripple current component is big, and the alternating component of battery discharging is big, cannot really reflect the electric discharge electricity of accumulator
Stream.
We carry out test hair to the 110V battery dischargings machine for controlling battery discharging mode using PWM of certain brand
Existing, for Electrical Discharge Machine principle as shown in Figure 1, in discharge process, the negative peak of accumulator terminal reaches the half of battery tension.It is storing
The crest voltage that battery-end is formed is up to 165V.This inverse peak voltage is for the accumulator group of 54 section 2V monomer compositions, Ke Yirang
The crest voltage of 3V or more is formed on each single battery.This certainly will cause the progressive damage of accumulator group even to fail.Such as
This Electrical Discharge Machine of fruit is used for the electric discharge of lithium ion battery, than the accumulator group constituted if any 34 section 3.6V monomers, then may cause
The voltage of lithium-ion battery monomer is up to 4.8V or more, and serious is more than the limiting voltage of lithium-ions battery 4.2V, is very easy to
Lead to the accident that lithium-ions battery explodes.During battery discharging, if can not to the negative peak of battery discharging with
And harmonic wave is effectively controlled, it will serious accident is caused to occur.
Part researcher utilizes the temperature characterisitic of PTC, takes the rotating speed of control radiator fan, controls the temperature of PTC, to
The discharge current of accumulator is controlled, Electrical Discharge Machine principle is as shown in Figure 2.The Electrical Discharge Machine for taking this mode, due to the load of PTC
Electric current has very big relationship with the temperature of PTC itself, takes the mode of control radiating fan rotation speed, can not ensure PTC substantially
Temperature it is constant, also just can not really realize constant-current discharge substantially.This battery discharging mode does not have high-frequency harmonic ingredient, but
It is that the precision of discharge current is excessively poor, low-frequency component is very abundant, can form larger AC wave shape in accumulator terminal, also can
The performance of accumulator is had an impact.
Invention content
In order to overcome the deficiencies of the prior art, in conjunction with DC load discharge pulse free ingredient the advantages of and PWM mode ensure it is permanent
The advantages of banishing electric precision while realizing the current constant control of battery discharging, reduces and even battery discharging machine is avoided to cause
Accumulator terminal negative peak phenomenon, ensure that safety and the science of battery discharging process, the present invention propose a kind of pure direct current
Battery discharging machine.
The technical proposal of the invention is realized in this way：
A kind of pure direct-flow storage battery Electrical Discharge Machine, including
Connect the current transformer of accumulator group；
Connect the π type filter circuits of the current transformer；
Connect the choke coil of described π types filter circuit one end；
Connect the accurate adjustment load of the π types filter circuit other end；
At least one set of definite value load of the current transformer is connected, each definite value load is controlled by switching device；
Connect the CPU module of the switching device；
The PWM control modules of the CPU module are connected, the PWM control modules connect the accurate adjustment load；
The CPU module selects a certain number of switching devices according to the accumulator battery voltage and constant current value of setting
Conducting, makes definite value load current account for the highest rate of constant current；According to the difference between constant current and definite value load current,
The electric current that the pulse width adjustment accurate adjustment load of PWM control modules is controlled by CPU module, makes constant current be equal to definite value load electricity
The sum of stream and accurate adjustment load current；As accumulator group total voltage declines, definite value load current reduces, and accurate adjustment electric current increases, when
Definite value load current is more than limit value with modulation current ratio or PWM control module pulse widths are more than limit value, CPU module weight
The quantity of new adjustment definite value load break-make, restarts to recycle, until discharge off.
Further, the definite value load and/or accurate adjustment load use PTC or/and load resistance.
Further, the switching device is metal-oxide-semiconductor, by CPU module intelligent control break-make, acrotism during the work time
Dynamic ingredient, will not form any negative peak and harmonic wave.
Further, accurate adjustment load includes the DC load of 2 more parallels, is controlled by PWM module each straight
Operating current size on current load generates certain inverse peak voltage and harmonic current, and the electric current of PWM controls in the course of work
Bigger, inverse peak voltage is higher, and harmonic components are more.
A kind of pure direct-flow storage battery Electrical Discharge Machine of the present invention has the following advantages that：
(1) compared with traditional Electrical Discharge Machine, the present invention realizes pure direct-current discharge, solves negative peak and harmonic wave to accumulator group
The problem of damage, has higher safety；
(2) present invention uses pwm pulse technology accurate adjustment electric current, through choke coil combination π type filter circuits filtering negative peak and humorous
Ripple current component is eliminated after wave, realizes high precision constant current electric discharge, there is higher science.
Description of the drawings
Fig. 1 is tradition PWM control fever load discharge machine schematic diagrams；
Fig. 2 is traditional PTC heater Electrical Discharge Machine schematic diagram；
Fig. 3 is PWM frequency 5KHz, discharge current 20A situations in tradition PWM control fever load discharge machine discharge processes
Under accumulator terminal waveform accumulator voltage oscillogram；
Fig. 4 is PWM frequency 40KHz, discharge current 20A situations in tradition PWM control fever load discharge machine discharge processes
Under accumulator terminal waveform accumulator voltage oscillogram；
Fig. 5 is a kind of pure direct-flow storage battery Electrical Discharge Machine functional block diagram of the present invention；
Fig. 6 is a kind of pure direct-flow storage battery Electrical Discharge Machine one embodiment structure diagram of the present invention；
Fig. 7 is the accumulator voltage and current waveform figure in the embodiment discharge process of Fig. 6.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Traditional is to pass through control than more conventional and flexibility and reliability method for discharging storage batteries by PWM control discharge currents
The duty ratio of PWM processed is the size of controllable battery discharging electric current.One big drawback of this pattern is can be in accumulator terminal shape
The negative peak occurred at various harmonic waves and PWM the control switching device for following PWM frequency.Referring to Fig. 3, very due to negative peak peak value
Greatly, and amount of frequency spectrum is very abundant, and common filter circuit, absorbing circuit can not eliminate this negative peak signal.Fig. 3 be for
110V, 54 section the concatenated battery packs of single battery, using low frequency carry out PWM control battery discharging (PWM frequency 5KHz),
Accumulator terminal waveform in the case of discharge current 20A, Fig. 4 are 110V, the 54 section concatenated battery packs of single battery, using high frequency
Rate carries out the accumulator terminal waveform in the case of PWM control battery dischargings (PWM frequency 40KHz), discharge current 20A.Pwm pulse
Frequency is bigger, battery discharging electric current, and the voltage of accumulator group is higher, and the negative peak of accumulator is bigger, and harmonic components are bigger, occurs
Negative peak phenomenon it is also bigger to the damage of accumulator group.But due to accumulator group in discharge process voltage gradually decline etc. because
The presence of element, will realize constant-current discharge, inevitable using PWM controls battery discharging electric current.
Refer to Fig. 5, a kind of pure direct-flow storage battery Electrical Discharge Machine of the present invention, including
Connect the current transformer of accumulator group；
Connect the π type filter circuits of the current transformer；
Connect the choke coil of described π types filter circuit one end；
Connect the accurate adjustment load of the π types filter circuit other end；
At least one set of definite value load of the current transformer is connected, each definite value load is controlled by switching device；
Connect the CPU module of the switching device；
The PWM control modules of the CPU module are connected, the PWM control modules connect the accurate adjustment load；
The CPU module selects a certain number of switching devices according to the accumulator battery voltage and constant current value of setting
Conducting, makes definite value load current account for the highest rate of constant current；According to the difference between constant current and definite value load current,
The electric current that the pulse width adjustment accurate adjustment load of PWM control modules is controlled by CPU module, makes constant current be equal to definite value load electricity
The sum of stream and accurate adjustment load current；As accumulator group total voltage declines, definite value load current reduces, and accurate adjustment electric current increases, when
Definite value load current is more than limit value with modulation current ratio or PWM control module pulse widths are more than limit value, CPU module weight
The quantity of new adjustment definite value load break-make, restarts to recycle, until discharge off.
Wherein, PTC or load resistance may be used in definite value load and accurate adjustment load.From structure,
If definite value load uses PTC, since PTC itself has many advantages, such as small, light-weight and high cooling efficiency can be reduced and be put
The volume of motor.And accurate adjustment is carried out to discharge current by PWM, the requirement that PTC regulates and controls temperature is reduced, is had higher reliable
Property.
The definite value load is made of the DC load of multiple parallel connections, and each DC load is controlled by the switching device
Whether work.DC load group number and specification have direct influence to the discharge power of Electrical Discharge Machine.
Metal-oxide-semiconductor may be used in the switching device, by CPU module intelligent control break-make, pulse free during the work time
Ingredient will not form any negative peak and harmonic wave.
The accurate adjustment load is made of the DC load of 2 and more parallel, and each DC load is controlled by PWM module
On operating current size, certain inverse peak voltage and harmonic current are generated in the course of work, and the electric current of PWM controls is bigger,
Inverse peak voltage is higher, and harmonic components are more.
The choke coil combination π type filter circuits filtering avoids anti-since PWM controls the negative peak and harmonic wave that bring
Peak and harmonic wave are damaged caused by accumulator group.
The CPU module is according to accumulator battery voltage grade and constant-current discharge requirement, by controlling switching device and PWM
Control module intelligently adjusts the ratio of the discharge current of definite value load and the discharge current of accurate adjustment load, the electric discharge for making definite value load
Electric current accounts for total discharge current maximum ratio.
It is loaded for definite value in discharge process by the DC load of switching device control, due in accumulator group discharge process
Voltage value continuously decrease, definite value load electric current can continuously decrease, CPU module according at this time pass through increase PWM control modules
Pulse width, make PWM module control accurate adjustment load electric current increase, realize storage battery constant-current discharge.
Fig. 6 is a kind of pure direct-flow storage battery Electrical Discharge Machine one embodiment structure diagram of the present invention, and accumulator battery voltage is
200V, 10 heater 1 ... heaters 10 in parallel that definite value load is power 800W form, the fever that accurate adjustment load is 500W
Device A and heater B are composed in parallel.When definite value load heater is devoted oneself to work, the discharge current of each heater is 4A, maximum
Discharge current is 40A.If it is 30/4=7 that the discharge current set, which as 30A, needs the definite value load heater quantity devoted oneself to work,
A remaining 2A.It is worth noting that, the discharge current of definite value load is necessarily less than the discharge current value and maximum of setting.Definite value at this time
The discharge current of load is less than 30A, and the discharge current for starting PWM module adjustment accurate adjustment load heater A and heater B is supplied
2A。
Fig. 7 is the accumulator voltage and current waveform figure in the embodiment discharge process of Fig. 6.As seen from Figure 7, originally
The definite value load discharge electric current pulse free ingredient of invention, will not form any negative peak and harmonic wave.The pure direct current electric power storage of the present invention
The ratio for the discharge current that tank discharge machine controls the discharge current of definite value load and accurate adjustment loads in a certain range, such as makes definite value
The discharge current of load accounts for 90% or more of total discharge current, and the discharge current that accurate adjustment loads is made to account for the 10% of total discharge current
Or hereinafter, the realization difficulty of negative peak and harmonic wave for needing to filter can greatly be reduced, pass through choke coil and π type filter circuits
May filter that and inhibit the negative peak and harmonic wave that are generated by PWM controls, realize the pure direct-current discharge of accumulator, reduce Electrical Discharge Machine at
This.From the point of view of real data, the battery discharging electric current precision which realizes reaches 0.1%, far above domestic electric power storage at present
Tank discharge machine 3% or above current stability,.Moreover, the inverse peak voltage of accumulator terminal is less than 0.5V, accumulator ensure that
The safety of discharge process and science.
The accumulator group discharge process for applying the present invention includes the following steps：
The first step：The CPU module selects a certain number of open according to the accumulator battery voltage and constant current value of setting
Break-over of device is closed, definite value load current is made to account for the highest rate of constant current.
Second step：Difference between constant current and definite value load current is controlled the arteries and veins of PWM control modules by CPU module
Width adjustment accurate adjustment load current is rushed, constant current is made to be equal to the sum of definite value load current and accurate adjustment load current.
Third walks：As accumulator total voltage declines, definite value load current reduces, and accurate adjustment electric current increases, when definite value loads
Electric current is more than limit value with modulation current ratio or PWM control module pulse widths are more than limit value, and CPU module is readjusted fixed
It is worth load number, is started the cycle over from the first step, until discharge off.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (4)
1. a kind of pure direct-flow storage battery Electrical Discharge Machine, which is characterized in that including
Connect the current transformer of accumulator group；
Connect the π type filter circuits of the current transformer；
Connect the choke coil of described π types filter circuit one end；
Connect the accurate adjustment load of the π types filter circuit other end；
At least one set of definite value load of the current transformer is connected, each definite value load is controlled by switching device；
Connect the CPU module of the switching device；
The PWM control modules of the CPU module are connected, the PWM control modules connect the accurate adjustment load；
The CPU module selects a certain number of switch device conductives according to the accumulator battery voltage and constant current value of setting,
Definite value load current is set to account for the highest rate of constant current；According to the difference between constant current and definite value load current, by CPU
Module control PWM control modules pulse width adjustment accurate adjustment load electric current, make constant current be equal to definite value load current with
The sum of accurate adjustment load current；As accumulator group total voltage declines, definite value load current reduces, and accurate adjustment electric current increases, and works as definite value
Load current is more than limit value with modulation current ratio or PWM control module pulse widths are more than limit value, and CPU module is adjusted again
Setting valve loads the quantity of break-make, restarts to recycle, until discharge off.
2. pure direct-flow storage battery Electrical Discharge Machine as described in claim 1, which is characterized in that the definite value load and/or accurate adjustment are negative
It carries and uses PTC or/and load resistance.
3. pure direct-flow storage battery Electrical Discharge Machine as described in claim 1, which is characterized in that the switching device is metal-oxide-semiconductor, by
CPU module intelligent control break-make.
4. pure direct-flow storage battery Electrical Discharge Machine as described in claim 1, which is characterized in that the accurate adjustment load include 2 with
The DC load of upper parallel connection controls the operating current size in each DC load by PWM module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136658.3A CN108448663A (en) | 2018-02-09 | 2018-02-09 | A kind of pure direct-flow storage battery Electrical Discharge Machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136658.3A CN108448663A (en) | 2018-02-09 | 2018-02-09 | A kind of pure direct-flow storage battery Electrical Discharge Machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108448663A true CN108448663A (en) | 2018-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810136658.3A Pending CN108448663A (en) | 2018-02-09 | 2018-02-09 | A kind of pure direct-flow storage battery Electrical Discharge Machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565936A (en) * | 2018-06-27 | 2018-09-21 | 广东电网有限责任公司 | A kind of pure direct-flow storage battery Electrical Discharge Machine and its control method |
| CN116087816A (en) * | 2023-03-14 | 2023-05-09 | 九源云(广州)智能科技有限公司 | Storage battery pack nuclear capacity device with alloy resistance load |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089407A (en) * | 1993-01-05 | 1994-07-13 | 横河电机株式会社 | Switch mode power |
| CN202474906U (en) * | 2011-12-30 | 2012-10-03 | 广州泓淮电子科技有限公司 | Storage battery discharging apparatus |
| CN103856075A (en) * | 2012-12-03 | 2014-06-11 | 永济新时速电机电器有限责任公司 | Conversion module based on train auxiliary electrical system and train auxiliary electrical system |
| CN107359676A (en) * | 2017-09-04 | 2017-11-17 | 广州泓淮能源科技有限公司 | A kind of online charge and discharge control of battery and capacity check system and method |
-
2018
- 2018-02-09 CN CN201810136658.3A patent/CN108448663A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089407A (en) * | 1993-01-05 | 1994-07-13 | 横河电机株式会社 | Switch mode power |
| CN202474906U (en) * | 2011-12-30 | 2012-10-03 | 广州泓淮电子科技有限公司 | Storage battery discharging apparatus |
| CN103856075A (en) * | 2012-12-03 | 2014-06-11 | 永济新时速电机电器有限责任公司 | Conversion module based on train auxiliary electrical system and train auxiliary electrical system |
| CN107359676A (en) * | 2017-09-04 | 2017-11-17 | 广州泓淮能源科技有限公司 | A kind of online charge and discharge control of battery and capacity check system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565936A (en) * | 2018-06-27 | 2018-09-21 | 广东电网有限责任公司 | A kind of pure direct-flow storage battery Electrical Discharge Machine and its control method |
| CN116087816A (en) * | 2023-03-14 | 2023-05-09 | 九源云(广州)智能科技有限公司 | Storage battery pack nuclear capacity device with alloy resistance load |
| CN116087816B (en) * | 2023-03-14 | 2024-07-12 | 九源云(广州)智能科技有限公司 | Storage battery pack nuclear capacity device with alloy resistance load |
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Application publication date: 20180824 |
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