CN206481220U - Two-way DC DC converters - Google Patents
Two-way DC DC converters Download PDFInfo
- Publication number
- CN206481220U CN206481220U CN201720378436.3U CN201720378436U CN206481220U CN 206481220 U CN206481220 U CN 206481220U CN 201720378436 U CN201720378436 U CN 201720378436U CN 206481220 U CN206481220 U CN 206481220U
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- circuit
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- converter
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Abstract
The utility model discloses a kind of two-way DC DC converters, including the output of sample circuit, D.C. regulated power supply, two-way DC DC translation circuits, lithium battery group, drive circuit, single-chip microcomputer, direct-current discharge and display and button；The voltage x current information for the two-way DC DC translation circuits that single-chip microcomputer is collected according to sample circuit, two-way DC DC translation circuits automatic switchover mode of operation is controlled by drive circuit；When working in charge mode, D.C. regulated power supply is charged by two-way DC DC translation circuits to lithium battery group；When working in discharge mode, lithium battery group is exported by two-way DC DC translation circuits direct-current discharge；Circuit operation controls to show by single-chip microcomputer.The utility model can carry out precision control to charging current and output voltage, so that discharge and recharge efficiently, intelligent is realized to lithium battery group, and the light portable of device.
Description
Technical field
The utility model belongs to field of power electronics, more particularly to a kind of bidirectional DC-DC converter.
Background technology
In recent years, due to energy crisis and environmental pollution, all over the world in input huge fund development fuel cell car,
Two-way DC/DC conversion removes important component as fuel cell car, it is necessary to the change of transport condition, continually switch it
Working condition, its dynamic property quality, directly determines the response speed of automobile dynamic system.Before fuel cell power generation, pass through
Two-way DC/DC converters rise voltage keeps the stabilization of output power of power supply there is provided the energy of higher bus voltage.
So-called DC/DC converters are exactly the dual quadrant operation of DC/DC converters, and its input/output port is exchanged still can be complete
Into voltage transformation function, power can not only flow to output end from input, also can flow to input from output end, from various bases
From the point of view of this converter topology, single-way switch is replaced with two-way switch, the two-way flow of energy is realized.
It by a fixed DC voltage conversion is variable DC voltage that two-way DC/DC converters, which are, and it realizes double
To transmission, functionally equivalent to two unidirectional DC/DC converters, are typical " dual-use " equipment, are needing two-way energy
The volume weight and cost of system can be greatly reduced in the application scenario of amount flowing, there is important researching value.But current
Two-way DC/DC converters still have several drawbacks that what the instantaneous power that battery is provided when such as automobile starting, acceleration was not enough lacks
Fall into.
The utility model content of the invention
Goal of the invention：For problem above, the utility model proposes a kind of bidirectional DC-DC converter.
Technical scheme：To realize above-mentioned purpose of design, the technical scheme that the utility model is used is：A kind of two-way DC-
DC converters, including sample circuit, D.C. regulated power supply, bidirectional DC-DC converter circuit, lithium battery group, drive circuit, monolithic
Machine, direct-current discharge output and display and button；The voltage for the bidirectional DC-DC converter circuit that single-chip microcomputer is collected according to sample circuit
Current information, bidirectional DC-DC converter circuit automatic switchover mode of operation is controlled by drive circuit；When working in charge mode,
D.C. regulated power supply is charged by bidirectional DC-DC converter circuit to lithium battery group；When working in discharge mode, lithium battery group passes through
The electric discharge output of bidirectional DC-DC converter circuit direct；Circuit operation controls to show not by single-chip microcomputer.
D.C. regulated power supply includes power transformer, rectification circuit, filter circuit and mu balanced circuit；Power transformer is carried out
Decompression；Rectification circuit is three-phase full wave rectifier circuit；Filter circuit is filter capacitor, and mu balanced circuit is by voltage-regulator diode and current limliting
Resistance is constituted.
Drive circuit includes photoelectric coupled circuit, shaping circuit and half-bridge drive circuit；Photoelectric coupled circuit is light-coupled isolation chip；It is whole
Shape circuit is phase inverter；Half-bridge drive circuit is half-bridge driven chip.
Display includes button, liquid crystal display and red green indicator lamp with button；Button is used to set the charging under charge mode
Output voltage under electric current and discharge mode；Liquid crystal display is used to show mode of operation, voltage, electric current and efficiency for charge-discharge；It is red
Green indicator lamp is used to indicate charging progress.
Beneficial effect：The utility model can carry out precision control to charging current and output voltage, so as to lithium battery group
Realize discharge and recharge efficiently, intelligent.The light portable of device, can be as a kind of emergency set, the additional relay on the device basic
Switching circuit is connected to laboratory power network, when laboratory is powered off, and automatically switches to the device and provides electric energy for laboratory, realizes real
Room is tested not power off, meanwhile, the first order load that the device is alternatively some low-power makees back-up source, has a extensive future.
Brief description of the drawings
Fig. 1 is the schematic diagram of bidirectional DC-DC converter；
Fig. 2 is the schematic diagram of D.C. regulated power supply；
Fig. 3 is the circuit diagram of D.C. regulated power supply；
Fig. 4 is bidirectional DC-DC converter circuit diagram；
Fig. 5 is sample circuit figure；
Fig. 6 is drive circuit figure；
Fig. 7 is bidirectional DC-DC converter way circuit figure.
Embodiment
The technical solution of the utility model is further described with reference to the accompanying drawings and examples.
It is the schematic diagram of bidirectional DC-DC converter described in the utility model as shown in Figure 1, including sample circuit 1, direct current
Voltage-stabilized power supply 2, bidirectional DC-DC converter circuit 3, lithium battery group 4, drive circuit 5, single-chip microcomputer, direct-current discharge output 6 and display with
Button.
Using lithium ion battery as energy storage device, lithium ion battery has long lifespan, safe, and cost is low, control
Simply.In order to realize charging to lithium battery group, it is necessary to stable D.C. regulated power supply as bidirectional DC-DC converter circuit just
To input, the schematic diagram of D.C. regulated power supply 2 as shown in Figure 2, including power transformer, rectification circuit, filter circuit and voltage stabilizing electricity
Road, can be achieved to be converted to 50Hz, virtual value into the stable DC electricity of amplitude 30V, current adjustment for 220V three-phase alternating voltage
Pressure.
It is the specific circuit diagram of D.C. regulated power supply 2 as shown in Figure 3, rectification circuit is three-phase full wave rectifier circuit, filtering
Circuit is filter capacitor C1, and mu balanced circuit is made up of voltage-regulator diode D1 and current-limiting resistance R1.
Because the virtual value of the numerical value of DC voltage and line voltage needed for bidirectional DC-DC converter circuit differs larger, institute
To need power transformer to be depressured, transformer voltage ratio is 220：36.
Alternating voltage is converted to DC voltage by transformer secondary voltage by rectified three-phase circuit, and sine voltage is turned
The pulsating volage of single direction is changed to, the rectified three-phase circuit that the present invention is used is three-phase full wave rectifier circuit.
The DC voltage of rectified three-phase circuit output still contains larger AC compounent, to reduce mains ripple, it is necessary to logical
Cross filter circuit to be filtered DC voltage, make the DC voltage of output more smooth.Ideally filter circuit is defeated
It is the DC voltage for not containing AC compounent to go out voltage, but because filter circuit is passive filter circuit, so after access load
Necessarily affect filter effect.Filter capacitor C1 uses conventional electrolysis electric capacity.
Although filter circuit outputs the less DC voltage of AC compounent, but when voltage ripple of power network or load change
When, its average value can also produce change, so needing to cause output DC voltage substantially not by line voltage provided with mu balanced circuit
Fluctuation or the influence of load change, making the DC voltage of output has higher stability.Mu balanced circuit is by voltage-regulator diode D1
With current-limiting resistance R1 compositions, voltage-regulator diode uses IN4751 diodes, makes U2 stable in 30V.The mu balanced circuit utilizes voltage stabilizing
Guan Suoqi electric current adjustment effect, is compensated by the change of voltage and current on current-limiting resistance R1, reaches voltage stabilizing purpose.Limit
Leakage resistance R1 is that the electric current limited in voltage-stabiliser tube makes its normal work, and is engaged to reach the purpose of voltage stabilizing with voltage-stabiliser tube.
It is the schematic diagram of bidirectional DC-DC converter circuit as shown in Figure 4, this bidirectional DC-DC converter is divided into charging and discharging
Both of which, the function with automatic identification switching working mode, inside is used as whole system backfeed loop provided with single-chip microcomputer
Core, the voltage x current information on major loop that single-chip microcomputer is collected according to voltage, current sampling circuit, by drive circuit from
Dynamic switching working mode.Detailed process is：After device starts, device internal switch S1 initial defaults disconnect, and lithium battery is to list
Piece machine, sample circuit and drive circuitry, to voltage USSampled, work as USWhen being not 0, device enters charging Working mould
Formula, works as USFor 0 when, device enter electric discharge mode of operation, according to the mode of operation of identification control drive circuit export PWM ripples,
Realize that mode of operation switches, subsequent closure switch S1.
When converter is operated in charge mode, second switch pipe Q2 shut-offs, bidirectional DC-DC converter circuit equivalent is BUCK
Reduction voltage circuit, now U2 is as input voltage, and U1 is output voltage, and U2 constant is 30V.First switch pipe Q1 grids are in PWM ripples
Control under carry out periodic break-make.During Q1 is opened, input voltage is directly exported through Q2, and now diode D2 is because bearing
Back-pressure and end, output current by Q2 flow into inductance, inductive current rise, inductance carry out energy storage, output current is simultaneously
Also battery is charged；When Q1 is turned off, load with input voltage depart from, because inductive current can not be mutated, its by load and
Fly-wheel diode realizes afterflow, and inductive current is declined by linear rule, while energy is released into battery.
Device initially enters constant current charging mode under charge mode, and by button, stepping sets electricity in the range of 1-2A
Pond charging current, is influenceed, battery charge can be produced by the fluctuation and load of bidirectional DC-DC converter circuit input voltage
Raw fluctuation, in order to keep charging current constant in this stage, single-chip microcomputer is become by changing PWM ripple duty cycle adjustments bi-directional DC-DC
Change the output voltage of circuit, stable output current.When setting charging current as 2A, to ensure device security, device is automatic
Started charging protection function, when U1 exceedes threshold value 24V, drive circuit stops output drive signal, and battery is protected.When
When cell voltage is gradually risen to 21V, device is automatically into constant-voltage charge pattern, and control method is identical with constant current mode, control
Target is converted to charging voltage from charging current, keeps charging voltage to be constant at 21V, charging current is gradually reduced.With automatic
Power-off protection function, i.e., it is automatic to disconnect switch S1 when charging current is close to 0, stop charging to battery.
When converter is operated in discharge mode, metal-oxide-semiconductor Q1 shut-offs, lithium battery powers to the load as power supply, two-way DC-
DC translation circuits are equivalent to BOOST booster circuits, and now U1 is input voltage, and U2 is output voltage, and U1 constant is 24V, output
Voltage can realize regulation and control by changing PWM ripples dutycycle.Metal-oxide-semiconductor Q2 grids carry out periodicity break-make under the control of PWM ripples.Work as Q2
When opening, diode D2 reverse bias and turn off, battery is powered through Q2 to inductance L1 makes its energy storage, and electric current is by linear in inductance L1
Rule rises, while the voltage on electric capacity C2 powers to the load, capacitance voltage reduces.When Q2 is turned off D2 turn on, lithium battery and
Inductance charges to electric capacity jointly, and provides energy to load.
It is the sample circuit of bidirectional DC-DC converter as shown in Figure 5, current Hall element is connected into needing to measure electric current
Used in loop, the parallel connection of voltage Hall element is entered to be used in the loop for needing to measure voltage.Examined by voltage, current Hall element
The equivalent voltage value measured, sends into single-chip processor i/o mouthful through follower and carries out AD samplings, compared with preset value in SCM program
Afterwards, corresponding feedback regulation and correction are carried out with pid algorithm, realizes required function.
It is the drive circuit of bidirectional DC-DC converter as shown in Figure 6, the effect of drive circuit is what single-chip microcomputer was exported
PWM ripples are isolated, shaping, and final realize is controlled the break-make of the FET of bidirectional DC-DC converter circuit.Drive circuit by
Three parts are constituted, photoelectric coupled circuit, shaping circuit and half-bridge drive circuit.
Because single-chip microcomputer belongs to digital circuit, and drive circuit and bidirectional DC-DC converter circuit belong to analog circuit, institute
To need photoelectric coupled circuit to realize isolating for single-chip microcomputer and main circuit, from light-coupled isolation chip 6N137, protection single-chip microcomputer simultaneously reduces
Both influences from each other.In order to realize the quick on-off of FET, it is necessary to ensure that PWM rising edge and trailing edge are enough
It is precipitous, so realizing the shaping to PWM ripples by phase inverter 74LS04.The PWM ripples driving force that single-chip microcomputer is exported not enough, is needed
Half-bridge driven chip IR2111 is wanted to improve the driving force of drive circuit, driving chip output two-way amplitude is identical, dutycycle is mutual
The PWM ripples of benefit, wherein floating ground, all the way over the ground all the way, control metal-oxide-semiconductor Q1 and Q2 respectively.
Display includes button, liquid crystal display and red green indicator lamp with button；Wherein, by the charging under key assignments charge mode
Output voltage under electric current, setting discharge mode.
Liquid crystal display content includes：It is currently at charge mode or discharge mode；When in charge mode, display
In constant current charging mode or constant-voltage charge pattern, while charge efficiency is shown in real time, charging current, charging voltage；It is in
When discharge mode, display output voltage and discharging efficiency.
Red green indicator lamp：When device charges to lithium battery group, green light, which sends out a warning, to go out, when device is automatically stopped to electricity
When pond is charged, green light goes out when red, points out user's charging complete.
If Fig. 7 is bidirectional DC-DC converter way circuit figure, BUCK reduction voltage circuits and BOOST booster circuits work in electricity
Inducing current continuous mode (CCM).
During test, 220V three phase mains is connect, device is entered charge mode.
(1) constant current charging mode is shown, regulation charging current to 1A, 1.5A and 2A measures charging current actual value, meter
Calculate current control accuracy.The measured value that liquid crystal display is shown is recorded simultaneously, calculates measurement accuracy.
(2) I1=2A is set, the influence for simulation three phase mains or load to U2 is connected one in major loop and slides variable resistance
Device, changes U2 voltages, measurement record charging current value calculates charging current rate of change by changing slide rheostat resistance.With
Slide rheostat is sealed in lithium battery group afterwards, makes U1 increase, slide rheostat resistance is now adjusted, observation exceedes threshold value as U1
U1(th)Whether charging is stopped during=24V.
(4) more changing device lithium battery group, accesses close to fully charged lithium battery group, sees whether be directly entered constant-voltage charge mould
Formula.Simultaneously when charging current reduces to a certain extent, if stop charging to battery.
(5) rated condition is set, universal meter current gear and voltage gear are gone here and there respectively and are incorporated in the loop of input and output, meter
The actual efficiency of converter is calculated, and is compared with show value, measurement accuracy is calculated.
Three phase mains is disconnected, device is set to discharge mode by load end access slide rheostat.
(1) output voltage is set, output voltage is measured, voltage control accuracy is calculated.The survey that liquid crystal display is shown is recorded simultaneously
Value, calculates measurement accuracy.
(2) U2=30V is kept, universal meter current gear and voltage gear are gone here and there respectively and are incorporated in the loop of input and output, meter
The actual efficiency of converter is calculated, and is compared with show value, measurement accuracy is calculated.
Claims (4)
1. a kind of bidirectional DC-DC converter, it is characterised in that：Including sample circuit, D.C. regulated power supply, bidirectional DC-DC converter
Circuit, lithium battery group, drive circuit, single-chip microcomputer, direct-current discharge output and display and button；
Wherein, the voltage x current information for the bidirectional DC-DC converter circuit that single-chip microcomputer is collected according to sample circuit, by driving electricity
Road controls bidirectional DC-DC converter circuit automatic switchover mode of operation；When working in charge mode, D.C. regulated power supply passes through two-way
DC-DC conversion circuit charges to lithium battery group；When working in discharge mode, lithium battery group is straight by bidirectional DC-DC converter circuit
Banish electricity output；Circuit operation controls to show by single-chip microcomputer.
2. bidirectional DC-DC converter according to claim 1, it is characterised in that：The D.C. regulated power supply includes power supply
Transformer, rectification circuit, filter circuit and mu balanced circuit；
Wherein, power transformer is depressured；Rectification circuit is three-phase full wave rectifier circuit；Filter circuit is filter capacitor, surely
Piezoelectricity routing zener and current-limiting resistance composition.
3. bidirectional DC-DC converter according to claim 1, it is characterised in that：The drive circuit include photoelectric coupled circuit,
Shaping circuit and half-bridge drive circuit；
Wherein, photoelectric coupled circuit is light-coupled isolation chip；Shaping circuit is phase inverter；Half-bridge drive circuit is half-bridge driven chip.
4. bidirectional DC-DC converter according to claim 1, it is characterised in that：The display includes button, liquid with button
Crystalline substance display and red green indicator lamp；
Wherein, button is used to set the output voltage under the charging current and discharge mode under charge mode；Liquid crystal display is used for
Show mode of operation, voltage, electric current and efficiency for charge-discharge；Red green indicator lamp is used to indicate charging progress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378436.3U CN206481220U (en) | 2017-04-11 | 2017-04-11 | Two-way DC DC converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378436.3U CN206481220U (en) | 2017-04-11 | 2017-04-11 | Two-way DC DC converters |
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| Publication Number | Publication Date |
|---|---|
| CN206481220U true CN206481220U (en) | 2017-09-08 |
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ID=59746872
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720378436.3U Expired - Fee Related CN206481220U (en) | 2017-04-11 | 2017-04-11 | Two-way DC DC converters |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947291A (en) * | 2017-12-21 | 2018-04-20 | 沈阳贝特瑞科技有限公司 | A kind of accumulator cell charging and discharging management system |
| CN109591579A (en) * | 2017-09-29 | 2019-04-09 | 比亚迪股份有限公司 | Hybrid vehicle and its dynamical system |
| CN112440815A (en) * | 2019-08-30 | 2021-03-05 | 北京新能源汽车股份有限公司 | High-voltage controller, system and electric automobile |
| EP4068607A1 (en) * | 2021-03-30 | 2022-10-05 | TDK Corporation | Power conversion apparatus and power conversion system |
| CN116404738A (en) * | 2023-02-21 | 2023-07-07 | 南京汉科明德医疗科技有限公司 | UPS module based on high-voltage battery pack |
-
2017
- 2017-04-11 CN CN201720378436.3U patent/CN206481220U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109591579A (en) * | 2017-09-29 | 2019-04-09 | 比亚迪股份有限公司 | Hybrid vehicle and its dynamical system |
| CN109591579B (en) * | 2017-09-29 | 2022-02-08 | 比亚迪股份有限公司 | Hybrid electric vehicle and power system thereof |
| CN107947291A (en) * | 2017-12-21 | 2018-04-20 | 沈阳贝特瑞科技有限公司 | A kind of accumulator cell charging and discharging management system |
| CN112440815A (en) * | 2019-08-30 | 2021-03-05 | 北京新能源汽车股份有限公司 | High-voltage controller, system and electric automobile |
| CN112440815B (en) * | 2019-08-30 | 2022-06-28 | 北京新能源汽车股份有限公司 | High-voltage controller, high-voltage controller system and electric automobile |
| EP4068607A1 (en) * | 2021-03-30 | 2022-10-05 | TDK Corporation | Power conversion apparatus and power conversion system |
| CN116404738A (en) * | 2023-02-21 | 2023-07-07 | 南京汉科明德医疗科技有限公司 | UPS module based on high-voltage battery pack |
| CN116404738B (en) * | 2023-02-21 | 2024-05-17 | 南京汉科明德医疗科技有限公司 | UPS module based on high-voltage battery pack |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170908 Termination date: 20210411 |
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| CF01 | Termination of patent right due to non-payment of annual fee |