CN104600808A - Lithium battery charging device and method thereof - Google Patents
Lithium battery charging device and method thereof Download PDFInfo
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- CN104600808A CN104600808A CN201510061764.6A CN201510061764A CN104600808A CN 104600808 A CN104600808 A CN 104600808A CN 201510061764 A CN201510061764 A CN 201510061764A CN 104600808 A CN104600808 A CN 104600808A
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- lithium battery
- boost booster
- booster circuit
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- H02J7/0003—
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a lithium battery charging device and a method thereof. The lithium battery charging device comprises an input circuit component, a boost circuit, a charging control system, a battery pack, a self-oscillating reverse excitation circuit and a load circuit. The boost circuit and the charging control circuit are connected with the input circuit component, the battery pack and the self-oscillating reverse excitation circuit are connected with the boost circuit, and the load circuit is connected with the self-oscillating reverse excitation circuit. The charging control system is connected with the load circuit and controls the load circuit. The lithium battery charging device and the method thereof have the advantages that two modes including high-power charging and constant-voltage charging are achieved through the boost circuit and the charging control system, and thus, a lithium battery is charged with electricity generated by a low-voltage photovoltaic module; through output and an RCC quasi-resonance soft-switching technology of the self-oscillating reverse excitation circuit, softening of a power switch is achieved, so that conversion efficiency is improved and electromagnetic interference is reduced; multiple voltage output can be realized conveniently by the reverse excitation circuit, so that application range of the lithium battery is widened.
Description
Technical field
The present invention relates to a kind of charging method of battery, refer more particularly to charging device and method thereof that the charging of a kind of photovoltaic module enters lithium battery.
Background technology
Lithium battery is as the energy-accumulating medium of a new generation, having can rapid large-current charging and the advantage of big current overdischarge, the charging input of current lithium battery generally all adopts single channel USB power source to input, the application of lithium battery so then cannot be realized in the place that cannot obtain input power, and solar energy is as extensive and general new forms of energy, can obtain local arbitrarily.Solar components input is utilized space as a kind of charging modes of lithium battery by what improve lithium battery greatly.Control mode at present as battery energy converting system generally adopts analogue enlargement to realize; adopt analogue enlargement cannot realize the accurate control and protection of efficiency; general lead-acid battery adopts photovoltaic module input can not consider its efficiency exported; but have the ability of large current charge as lithium battery, so the requirement of photovoltaic module maximum wind power extract will seem extremely important.And BUCK circuit generally can be adopted to export for general storage battery output circuit, so BUCK circuit does not have isolation features, and is inconvenient to realize multiple-channel output, and adopts general circuit of reversed excitation, and its switch is the shortcomings such as hard switching pattern.
Summary of the invention
Too low for photovoltaic module voltage in prior art, the phenomenon in lithium battery cannot be filled with, this invention exploits a kind of lithium battery charging device and method thereof.
In order to realize above-mentioned technical purpose, the technical solution used in the present invention is to provide a kind of lithium battery charging device with BOOST booster circuit and method thereof, this charging device comprises the charge control system of input circuit assembly, the BOOST booster circuit be connected with input circuit assembly, control BOOST booster circuit, the battery pack be connected with BOOST booster circuit, the self-oscillation circuit of reversed excitation be connected with battery pack, the load circuit be connected with self-oscillation circuit of reversed excitation, wherein, described charge control system is connected with load circuit, and control load circuit.
The preferred embodiment of the invention is, wherein, load circuit is RCC circuit of reversed excitation.
The preferred embodiment of the invention is, described BOOST booster circuit raises the voltage that input circuit assembly exports in charging process, realizes input circuit assembly to lithium cell charging.
The preferred embodiment of the invention is, realizes lithium battery charging device digitlization accurately control by described charge control system control BOOST booster circuit, by the current i on the digital measuring input circuit assembly that charge control system is built-in
pvwith voltage V
pvthen judgement is calculated, realize the on/off of charge control system control BOOST booster circuit main switch, by the voltage on Resonant tube circuit of reversed excitation determination output loading circuit, feed back to the break-make of the primary control determination main switch of self-oscillation circuit of reversed excitation again, realize the accurate control to load circuit voltage requirements.
The preferred embodiment of the invention is, wherein, described input circuit assembly comprises photovoltaic module and USB interface component.
The preferred embodiment of the invention is, wherein, described photovoltaic module comprises at least one, and described BOOST booster circuit comprises at least one, described photovoltaic module and BOOST booster circuit one-to-one relationship.
The preferred embodiment of the invention is, wherein, described battery pack is lithium iron phosphate storage battery group.
The preferred embodiment of the invention is, wherein, described self-resonance circuit of reversed excitation comprises the earth resistance R with battery pack
g, diode ZD
1, by earth resistance R
g, diode ZD
1set up power switch pipe V
2switch drive voltage, power switch pipe V
2conducting forms flyback transformer, coil L
1voltage and ancillary coil L
2formation ratio coil positive voltage is set up, coil L
2the voltage exported is by the first electric capacity C
1, the second resistance R
2driving power switching tube V
2, meanwhile, coil L
2output voltage is by forward diode VD
3to the second electric capacity C
2charging, the second electric capacity C
2voltage reach transistor VT
1conducting voltage, then transistor VT
1conducting, power switch pipe V
2gate-drive drag down, power switch pipe V
2turn off, as coil L
3after having voltage to export, the second electric capacity C
2start electric discharge, the second electric capacity C
2voltage reduction causes transistor VT
1disconnect, the second electric capacity C
2by backward diode VD during electric discharge
3, the 3rd resistance R
3to the first electric capacity C
1charging, the first electric capacity C
1voltage raises, driving power switching tube V again
2conducting, by the second electric capacity C
2the charging gone round and begun again, electric discharge formed vibration, reach main switch V
2conducting, turn off.
A charging method for lithium battery, wherein, charging method comprises the following steps:
A), the quick charge stage, when described charge control system detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge that battery pack is the need of filling soon, when determining that lithium battery needs to fill soon, then carry out power control to BOOST booster circuit, charge control system goes out the switching frequency of switching tube by detecting charging system calculation of parameter
with duty cycle of switching
, and by-pass cock frequency
in Po, realize input circuit assembly (101) maximum power and be input to lithium battery group;
B), constant voltage charging phase, described charge control system detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge whether battery pack enters constant voltage charge, when determining that lithium battery needs to enter constant voltage charge, BOOST booster circuit enters the Isobarically Control pattern of determining frequency, the switch fixed frequency 100KHz of main switch.
The preferred embodiment of the invention is, when the BOOST booster circuit in the described quick charge stage is in maximum power operational mode, has: the exciting voltage of inductance is
, the degaussing voltage of inductance is
;
BOOST booster circuit works in electric current critical continuous conduction mode, then have according to the voltage-second balance relation of inductance,
； （1）
Derivation obtains duty cycle of switching,
; （2）
； （3）
Wherein d is the conducting duty ratio of BOOST booster circuit master switch, and Ts is switch periods,
for inputting the voltage of photovoltaic module,
for the charging voltage of lithium battery.
(2), the stored energy E1 of each switch periods internal inductance is:
（4）
The ENERGY E 2 outputting to battery in each switch periods is:
（5）
According to the principle of the conservation of energy, there is E1=E2.
（6）
According to Faraday's law, the voltage of BOOST inductance has:
（7）
Get integration to above formula both sides, can obtain inductive current has:
（8）
Bring (8) formula into formula 6, then have the switch periods of BOOST booster circuit to be:
（9）
The preferred embodiment of the invention is, wherein, when described lithium battery enters the quick charge stage, and can according to the input photovoltaic module voltage of Digital Discrete detection system
, the terminal voltage of lithium battery
, according to formula 3 calculate BOOST booster circuit control power switch pipe open duty ratio, through type 9 calculates the turn-on cycle of BOOST booster circuit control switch pipe, by have in the calculating formula of turn-on cycle control export power
, according to
with
realize the acquisition algorithm of maximum power.
The preferred embodiment of the invention is, wherein, when described lithium battery is in constant voltage charging phase, BOOST booster circuit adopts fixed frequency modes, then have:
Getting fixed frequency is 100KHz, and namely switch periods is:
The control planning of the input voltage that the computing formula of its duty ratio then arrives according to Digital Detecting and output voltage, is specially:
。
Technique effect of the present invention is, charging device front end adopts BOOST booster circuit, by the detection of charge control system with judge for distinguishing lithium battery charging stage, power is adopted to control in the large current charge stage, and the Isobarically Control pattern of constant switching frequency is adopted in the constant voltage charging stage of low current charge, the power voltage characteristic of photovoltaic module and the functional requirement perfect adaptation of lithium battery are got up, and the rear end of ferric phosphate lithium cell charging device adopts Resonant tube circuit of reversed excitation to export, it is simple that Resonant tube circuit of reversed excitation has circuit, the RCC quasi-resonance soft switch technology of circuit of reversed excitation, the softening of power switch can be realized, improve conversion efficiency, reduce the electromagnetic interference of system, and circuit of reversed excitation conveniently can realize the output of many group voltage, expand the scope of application of lithium battery.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation with the lithium battery energy conversion system of photovoltaic module input.
Fig. 2 is BOOST booster circuit control flow schematic diagram.
Fig. 3 is the P-V curve synoptic diagram of photovoltaic module.
Fig. 4 is self-oscillation circuit of reversed excitation schematic diagram.
Embodiment
Describe technical scheme of the present invention in order to clearer, below in conjunction with accompanying drawing, the present invention is described further.
Embodiment one
As shown in Figure 1, lithium battery charging device comprises the charge control system 105 of input circuit assembly 101, the BOOST booster circuit 102 be connected with input circuit assembly 101, control BOOST booster circuit 102, the battery pack 103 be connected with BOOST booster circuit 102, the self-oscillation circuit of reversed excitation (104) be connected with battery pack 103, the load circuit 106 be connected with self-oscillation circuit of reversed excitation 104, wherein, described charge control system 105 is connected with load circuit 106, and control load circuit 106, wherein, load circuit 106 is RCC circuit of reversed excitation.
Wherein, at least one BOOST booster circuit 102 is arranged on the front end of lithium battery charging device, and the rear end of lithium battery charging device is provided with at least one RCC circuit of reversed excitation.
Input circuit assembly 101 comprises at least one photovoltaic module, and a USB interface component.Wherein, photovoltaic module and BOOST booster circuit one-to-one relationship.
The preferred embodiment of the invention is, wherein, described battery pack 103 is lithium iron phosphate storage battery group.
When input circuit assembly 101 is photovoltaic module, the major loop front end of lithium battery charging device adopts BOOST booster circuit 102, photovoltaic energy is input to lithium battery 103 by BOOST booster circuit, and the energy in lithium battery is outputted in load circuit 106 by self-oscillation circuit of reversed excitation 104.Charge control system 105 is by detecting the voltage U of photovoltaic module
pv, the current i of photovoltaic module
pvwith the voltage U of lithium battery group 103
out, judge that the operating state of BOOST booster circuit is power mode output or constant voltage output mode by detected parameters, calculate the control signal PWM1 drived control main switch V of output according to the operating state of BOOST booster circuit
1, by detecting the current i of load
o, judge the load state of lithium battery charging device, lithium battery charging device overload then carrys out control switch pipe V by PWM2
3.
As shown in Figure 2, charge control system 105 detects the terminal voltage U of lithium battery
out, according to terminal voltage U
outdetected value determine whether to need to fill soon? fill demand soon if be in, then carry out power control to BOOST booster circuit 102, charge control system 105 calculates the switching frequency of switching tube by the system parameters detected
with duty cycle of switching
, control the stage at power, by-pass cock frequency
in Po, thus realize photovoltaic module maximum power output to lithium battery.When lithium battery detect need constant voltage charge time, lithium battery is in the low current charge stage, and BOOST booster circuit 102 enters determines frequency Isobarically Control pattern, and the switch of main switch adopts fixed frequency 100KHz, reaches Isobarically Control requirement.
Shown in Fig. 3, the power vs. voltage curve that photovoltaic module exports, abscissa is the voltage of photovoltaic module, and ordinate is the power of photovoltaic module.BOOST booster circuit 102 controls photovoltaic module and to climb from right side slope, lithium battery is in large current charge demand, so the output of photovoltaic module will operate in the maximum power district of power vs. voltage curve, if lithium battery is in constant voltage low current charge demand, so system more will may operate at left side or right side according to voltage requirements photovoltaic module.
As shown in Figure 4, self-resonance circuit of reversed excitation comprises the earth resistance R with battery pack (103)
g, diode ZD
1, by earth resistance R
g, diode ZD
1set up power switch pipe V
2switch drive voltage, power switch pipe V
2conducting forms flyback transformer, coil L
1voltage and ancillary coil L
2formation ratio coil positive voltage is set up, coil L
2the voltage exported is by the first electric capacity C
1, the second resistance R
2driving power switching tube V
2, meanwhile, coil L
2output voltage is by forward diode VD
3to the second electric capacity C
2charging, the second electric capacity C
2voltage reach transistor VT
1conducting voltage, then transistor VT
1conducting, power switch pipe V
2gate-drive drag down, power switch pipe V
2turn off, as coil L
3after having voltage to export, the second electric capacity C
2start electric discharge, the second electric capacity C
2voltage reduction causes transistor VT
1disconnect, the second electric capacity C
2by backward diode VD during electric discharge
3, the 3rd resistance R
3to the first electric capacity C
1charging, the first electric capacity C
1voltage raises, driving power switching tube V again
2conducting, by the second electric capacity C
2the charging gone round and begun again, electric discharge formed vibration, reach main switch V
2conducting, turn off, achieve the output of self-resonance circuit of reversed excitation.
In the charging process of lithium battery, it comprises the following steps:
A), the quick charge stage, when described charge control system 105 detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge that battery pack 103 is the need of filling soon, when determining that lithium battery needs to fill soon, then carry out power control to BOOST booster circuit 102, charge control system 105 goes out the switching frequency of switching tube by detecting charging system calculation of parameter
with duty cycle of switching
, and by-pass cock frequency
in Po, realize input circuit assembly 101 maximum power and be input to lithium battery group 103;
B), constant voltage charging phase, described charge control system 105 detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge whether battery pack 103 enters constant voltage charge, when determining that lithium battery needs to enter constant voltage charge, BOOST booster circuit 102 enters the Isobarically Control pattern of determining frequency, the switch fixed frequency 100KHz of main switch.
When the BOOST booster circuit 102 in the described quick charge stage is in maximum power operational mode, have: the exciting voltage of inductance is
, the degaussing voltage of inductance is
;
BOOST booster circuit 102 works in electric current critical continuous conduction mode, then have according to the voltage-second balance relation of inductance,
； （1）
Derivation obtains duty cycle of switching,
; （2）
； （3）
Wherein d is the conducting duty ratio of BOOST booster circuit 102 master switch, and Ts is switch periods,
for inputting the voltage of photovoltaic module 101,
for the charging voltage of lithium battery.
(2), the stored energy E1 of each switch periods internal inductance is:
（4）
The ENERGY E 2 outputting to battery in each switch periods is:
（5）
According to the principle of the conservation of energy, there is E1=E2.
（6）
According to Faraday's law, the voltage of BOOST inductance has:
（7）
Get integration to above formula both sides, can obtain inductive current has:
（8）
Bring (8) formula into formula 6, then have the switch periods of BOOST booster circuit to be:
（9）。
When lithium battery enters the quick charge stage, can according to input photovoltaic module 101 voltage of Digital Discrete detection system
, the terminal voltage of lithium battery
, according to formula 3 calculate BOOST booster circuit control power switch pipe open duty ratio, through type 9 calculates the turn-on cycle of BOOST booster circuit 102 control switch pipe, by have in the calculating formula of turn-on cycle control export power P o, according to Po with
realize the acquisition algorithm of maximum power.
When lithium battery is in constant voltage charging phase, BOOST booster circuit adopts fixed frequency modes, then have:
Getting fixed frequency is 100KHz, and namely switch periods is:
The control planning of the input voltage that the computing formula of its duty ratio then arrives according to Digital Detecting and output voltage, is specially:
。
In charging process, the voltage that BOOST booster circuit 102 exports by raising input circuit assembly 101, realizes input circuit assembly 101 to lithium cell charging.Realize lithium battery charging device digitlization by charge control system 105 control BOOST booster circuit 102 accurately to control, by the current i on the digital measuring input circuit assembly 101 that charge control system 105 is built-in
pvwith voltage V
pvthen judgement is calculated, realize the on/off of charge control system 105 control BOOST booster circuit main switch, the voltage on output loading circuit 106 is determined by Resonant tube circuit of reversed excitation 104, feed back to the break-make of the primary control determination main switch of self-oscillation circuit of reversed excitation 104 again, realize the accurate control to load circuit 106 voltage requirements.
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively detailed, as long as those skilled in the art is after viewing embodiments of the invention, under not departing from the prerequisite of the present invention's design, the change made all belongs to protection scope of the present invention.But embodiment as herein described can not be interpreted as and limit protection scope of the present invention.
Claims (11)
1. a lithium battery charging device, it is characterized in that, described lithium battery charging device comprises input circuit assembly (101), the BOOST booster circuit (102) be connected with input circuit assembly (101), the battery pack (103) be connected with BOOST booster circuit (102), the self-oscillation circuit of reversed excitation (104) be connected with battery pack (103), the load circuit (106) be connected with self-oscillation circuit of reversed excitation (104) can be realized by Resonant tube circuit of reversed excitation (104), wherein, charge control system (105) is connected with load circuit (106) with BOOST booster circuit (102), and load circuit (106) operation conditions of monitoring, realize load circuit (106) overcurrent, short circuit, the protections such as overvoltage.
2. lithium battery charging device according to claim 1, is characterized in that, described BOOST booster circuit (102) raises the voltage that input circuit assembly (101) exports in charging process, realizes input circuit assembly (101) to lithium cell charging.
3. lithium battery charging device according to claim 1, it is characterized in that, realize lithium battery charging device digitlization by described charge control system (105) control BOOST booster circuit (102) accurately to control, by the current i on the digital measuring input circuit assembly (101) that charge control system (105) is built-in
pvwith voltage V
pvthen judgement is calculated, realize the on/off of charge control system (105) control BOOST booster circuit main switch, the voltage on output loading circuit (106) is determined by Resonant tube circuit of reversed excitation (104), feed back to the break-make of the primary control determination main switch of self-oscillation circuit of reversed excitation (104) again, realize the accurate control to load circuit (106) voltage requirements.
4. lithium battery charging device according to claim 1, is characterized in that, described load circuit (106) is RCC circuit of reversed excitation.
5. lithium battery charging device according to claim 1, is characterized in that, described input circuit assembly (101) comprises photovoltaic module and USB interface component.
6. lithium battery charging device according to claim 1, is characterized in that, described photovoltaic module comprises at least one, and described BOOST booster circuit (102) comprises at least one, described photovoltaic module and BOOST booster circuit (102) one-to-one relationship.
7. lithium battery charging device according to claim 1, is characterized in that, described self-resonance circuit of reversed excitation comprises the starting resistance R with battery pack (103)
g, diode ZD
1, by starting resistance R
g, diode ZD
1set up power switch pipe V
2switch drive voltage, power switch pipe V
2conducting forms flyback transformer, coil L
1voltage and ancillary coil L
2formation ratio coil positive voltage is set up, coil L
2the voltage exported is by the first electric capacity C
1, the second resistance R
2driving power switching tube V
2, meanwhile, coil L
2output voltage is by forward diode VD
3to the second electric capacity C
2charging, the second electric capacity C
2voltage reach transistor VT
1conducting voltage, then transistor VT
1conducting, power switch pipe V
2gate-drive drag down, power switch pipe V
2turn off, as coil L
3after having voltage to export, the second electric capacity C
2start electric discharge, the second electric capacity C
2voltage reduction causes transistor VT
1disconnect, the second electric capacity C
2by backward diode VD during electric discharge
3, the 3rd resistance R
3to the first electric capacity C
1charging, the first electric capacity C
1voltage raises, driving power switching tube V again
2conducting, by the second electric capacity C
2the charging gone round and begun again, electric discharge formed vibration, reach main switch V
2conducting, turn off.
8. a charging method for lithium battery, is characterized in that, said method comprising the steps of:
A), the quick charge stage, when described charge control system (105) detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge that battery pack (103) is the need of filling soon, when determining that lithium battery needs to fill soon, then carry out power control to BOOST booster circuit (102), charge control system (105) goes out the switching frequency of switching tube by detecting charging system calculation of parameter
with duty cycle of switching
, and by-pass cock frequency
in Po, realize input circuit assembly (101) maximum power and be input to lithium battery group (103);
B), constant voltage charging phase, described charge control system (105) detects the terminal voltage U of lithium battery
out, according to U
outdetected value judge whether battery pack (103) enters constant voltage charge, when determining that lithium battery needs to enter constant voltage charge, the fixed Isobarically Control pattern frequently of BOOST booster circuit (102) incision, wherein, in BOOST booster circuit (102), the switch fixed frequency of main switch is 100KHz.
9. the charging method of a kind of lithium battery according to claim 7, is characterized in that, when the BOOST booster circuit in the described quick charge stage is in maximum power operational mode, has: the exciting voltage of inductance is
, the degaussing voltage of inductance is
;
BOOST booster circuit works in electric current critical continuous conduction mode, then have according to the voltage-second balance relation of inductance,
； （1）
Derivation obtains duty cycle of switching,
; （2）
； （3）
Wherein d is the conducting duty ratio of BOOST booster circuit master switch, and Ts is switch periods,
for inputting the voltage of photovoltaic module,
for the charging voltage of lithium battery,
(2), the stored energy E1 of each switch periods internal inductance is:
（4）
The ENERGY E 2 outputting to battery in each switch periods is:
（5）
According to the principle of the conservation of energy, there is E1=E2,
（6）
According to Faraday's law, the voltage of BOOST inductance has:
（7）
Get integration to above formula both sides, can obtain inductive current has:
（8）
Bring (8) formula into formula 6, then have the switch periods of BOOST booster circuit to be:
（9）。
10. the charging method of lithium battery according to claim 7, is characterized in that: when described lithium battery enters the quick charge stage, can according to the input photovoltaic module voltage of Digital Discrete detection system
, the terminal voltage of lithium battery
, according to formula 3 calculate BOOST booster circuit control power switch pipe open duty ratio, through type 9 calculates the turn-on cycle of BOOST booster circuit control switch pipe, by have in the calculating formula of turn-on cycle control export power
, according to
with
realize the acquisition algorithm of maximum power.
The charging method of 11. a kind of lithium batteries according to claim 7, is characterized in that: when described lithium battery is in constant voltage charging phase, and BOOST booster circuit adopts fixed frequency modes, then have:
Getting fixed frequency is 100KHz, and namely switch periods is:
The control planning of the input voltage that the computing formula of its duty ratio then arrives according to Digital Detecting and output voltage, is specially:
。
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|---|---|---|---|
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217428A (en) * | 2018-10-22 | 2019-01-15 | 广州金升阳科技有限公司 | A kind of current control method and the battery fast charge circuit using this method |
| CN109756120A (en) * | 2017-11-08 | 2019-05-14 | 比亚迪股份有限公司 | Safe power supply for trains and trains having the same |
| CN114567943A (en) * | 2022-02-10 | 2022-05-31 | 浙江大华技术股份有限公司 | Light supplement lamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109756120A (en) * | 2017-11-08 | 2019-05-14 | 比亚迪股份有限公司 | Safe power supply for trains and trains having the same |
| CN109756120B (en) * | 2017-11-08 | 2021-09-21 | 比亚迪股份有限公司 | A train that is used for safe power of train and has it |
| CN109217428A (en) * | 2018-10-22 | 2019-01-15 | 广州金升阳科技有限公司 | A kind of current control method and the battery fast charge circuit using this method |
| CN114567943A (en) * | 2022-02-10 | 2022-05-31 | 浙江大华技术股份有限公司 | Light supplement lamp |
| CN114567943B (en) * | 2022-02-10 | 2023-10-31 | 浙江大华技术股份有限公司 | Light supplementing lamp |
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| CN104600808B (en) | 2017-12-19 |
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