CN103475232A - High-precision bidirectional converter for electric energy storage and circulation - Google Patents
High-precision bidirectional converter for electric energy storage and circulation Download PDFInfo
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- CN103475232A CN103475232A CN2013104602706A CN201310460270A CN103475232A CN 103475232 A CN103475232 A CN 103475232A CN 2013104602706 A CN2013104602706 A CN 2013104602706A CN 201310460270 A CN201310460270 A CN 201310460270A CN 103475232 A CN103475232 A CN 103475232A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 21
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims abstract description 87
- 230000009466 transformation Effects 0.000 claims abstract description 10
- 230000002441 reversible effect Effects 0.000 claims description 35
- 230000009471 action Effects 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 9
- 238000011217 control strategy Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- -1 energy-storage units Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
A high-precision bidirectional converter (100) for electric energy storage and circulation comprises a primary side voltage-stabilizing capacitor (C1), a primary side high-frequency converter body (10), a primary side adjustable series resonance circuit (20), a high-frequency transformer (Th), a secondary side adjustable series resonance circuit (30), a secondary side high-frequency converter body (40), a secondary side voltage-stabilizing capacitor (C2) and an energy storage unit, and all the components are sequentially connected. The voltage-stabilizing capacitors (C1 and C2) are used for enhancing the stability of direct-current voltages at the two sides, the high-frequency converter bodies (10 and 40) are used for inversion and rectification, the adjustable series resonance circuits (20 and 30) are used for conducting fine adjustment and precision improvement on the voltages on the two sides by adjusting the resonance capacitors, and the high-frequency transformer (Th) is used for isolation and transformation. The converter (100) can greatly convert the direct-current voltages, is high in efficiency and precision, and can be used for electric energy circulation of electric vehicles, spare power sources of large-sized equipment and the like.
Description
Technical field
The present invention relates to a kind of DC/DC converter, particularly relate to a kind of two-way, isolated, high-precision, for power storage and the DC/DC converter that recycles.
Background technology
Two-way DC/DC converter has a very wide range of applications in the stand-by power supply of the energy-recuperation system of electric automobile, powerful device, powerful device.Energy-storage travelling wave tube adopts ultracapacitor or storage battery, by two-way its charging and discharging of DC/DC convertor controls.At present, two-way DC/DC converter topology is divided into isolated and non-isolation type converter, the topological structure of non-isolated BUCK/BOOST, be subject to the restriction of topological structure mainly to have following shortcoming: the first, the gain of BUCK/BOOST converter is generally on the low side, and the voltage transformation amplitude is difficult to over 5 times; The second, precision is lower, affects the useful life of energy-storage units.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, propose the high accuracy reversible transducer of a kind of power storage and circulation.This converter device by high frequency transformer isolate, transformation, the voltage transformation amplitude is very large; Voltage response is rapid, precision is high, and the charging and discharging process of energy-storage units is controlled fast, greatly extends its useful life.
The present invention is achieved by the following technical solutions, the present invention includes: primary side voltage regulation capacitor, primary side high-frequency converter, primary side adjustable serial resonant circuit, high frequency transformer, primary side adjustable serial resonant circuit, primary side high-frequency converter, primary side voltage regulation capacitor, energy-storage units, composition successively is linked in sequence.
The high accuracy reversible transducer of described power storage and circulation can make realizing bidirectional electric energy flow, is divided into the charging and discharging two states.When energy-storage units is charged, the primary side high-frequency converter is in inverter mode, and primary side adjustable serial resonant circuit is in resonance condition; The primary side high-frequency converter is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit is not worked, and its resonant capacitor is for filtering.During the energy-storage units electric discharge, the primary side high-frequency converter is in inverter mode, and primary side adjustable serial resonant circuit is in resonance condition; The primary side high-frequency converter is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit is not worked, and its resonant capacitor is for filtering.
Described primary side voltage regulation capacitor and primary side voltage regulation capacitor are respectively used to stablize primary side direct voltage and primary side direct voltage.
Described primary side high-frequency converter comprises: the first HF switch, the first high-frequency diode, the second HF switch, the second high-frequency diode, third high be switch, third high frequency diode, the 4th HF switch, the 4th high-frequency diode frequently.After the first HF switch and the first high-frequency diode inverse parallel and the second HF switch and the second high-frequency diode inverse parallel, be connected in series, after third high frequency switch and third high diode inverse parallel frequently and the 4th HF switch and the 4th high-frequency diode inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with elementary adjustable serial resonant circuit.
Described primary side high-frequency converter comprises: the 5th HF switch, the 5th high-frequency diode, the 6th HF switch, the 6th high-frequency diode, the 7th HF switch, the 7th high-frequency diode, the 8th HF switch, the 8th high-frequency diode.After the 5th HF switch and the 5th high-frequency diode inverse parallel and the 6th HF switch and the 6th high-frequency diode inverse parallel, be connected in series, after the 7th HF switch and the 7th high-frequency diode inverse parallel and the 8th HF switch and the 8th high-frequency diode inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with secondary adjustable serial resonant circuit.
Further, when primary side high-frequency converter and primary side high-frequency converter are used for inversion, adopt the discrete control mode of identical high-frequency converter, the different conduction mode according to switching tube, the output of primary side high-frequency converter and primary side high-frequency converter has three state, is referred to as forward resonance, free harmonic vibration and reverse resonance.Forward resonance is that the pulse voltage direction of primary side high-frequency converter or the output of primary side high-frequency converter is identical with direction of resonant current, and resonance current is played to booster action, is referred to as forward resonance; Primary side high-frequency converter or primary side high-frequency converter voltage pulse output are zero, and resonance current, without impact, is referred to as to free harmonic vibration; The pulse voltage direction of primary side high-frequency converter or the output of primary side high-frequency converter is contrary with direction of resonant current, makes resonance current weaken, and is referred to as reverse resonance.
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter, same state, the switch conduction mode that the different directions of resonance current is corresponding different.The switch conduction mode of forward resonance condition is: resonance current is timing, conducting the first HF switch and the 4th HF switch; When resonance current is negative, conducting the second HF switch and third high be switch frequently.Free harmonic vibration state of switch conduction mode is: resonance current is timing, conducting the first HF switch or the 4th HF switch, conducting the first HF switch and third high diode frequently make primary side adjustable serial resonant circuit form loop, and conducting the 4th HF switch and the second high-frequency diode make primary side adjustable serial resonant circuit form loop; When resonance current is negative, conducting the second HF switch or third high be switch frequently, conducting the second HF switch and the 4th high-frequency diode make primary side adjustable serial resonant circuit form loop, and conducting third high frequency switch and the first high-frequency diode make primary side adjustable serial resonant circuit form loop.Oppositely the switch conduction mode of resonance condition is: no matter resonance current is plus or minus, turn-off the first HF switch, the second HF switch, third high switch, the 4th HF switch frequently, when resonance current is timing, the second high-frequency diode and third high diode current flow frequently make primary side adjustable serial resonant circuit to elementary survey high-frequency converter input side feedback electric energy; When resonance current, when negative, the first high-frequency diode and the 4th high-frequency diode conducting make the input side feedback electric energy of primary side adjustable serial resonant circuit to the primary side high-frequency converter.
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter, same state, the switch conduction mode that the different directions of resonance current is corresponding different.The switch conduction mode of forward resonance condition is: resonance current is timing, conducting the 5th HF switch and the 8th HF switch; When resonance current is negative, conducting the 6th HF switch and the 7th HF switch.Free harmonic vibration state of switch conduction mode is: resonance current is timing, conducting the 5th HF switch or the 8th HF switch, conducting the 5th HF switch and the 7th high-frequency diode make primary side adjustable serial resonant circuit form loop, and conducting the 8th HF switch and the 6th high-frequency diode make primary side adjustable serial resonant circuit form loop; When resonance current is negative, conducting the 6th HF switch or the 7th HF switch, conducting the 6th HF switch and the 8th high-frequency diode make the primary side series resonant circuit form loop, and conducting the 7th HF switch and the 5th high-frequency diode make the primary side series resonant circuit form loop.Oppositely the switch conduction mode of resonance condition is: no matter resonance current is plus or minus, turn-off the 5th, six, seven, eight HF switch, when resonance current is timing, the 6th high-frequency diode and the 7th high-frequency diode conducting make primary side adjustable serial resonant circuit to the energy-storage units feedback electric energy; When resonance current, when negative, the 5th high-frequency diode and the 8th high-frequency diode conducting make primary side adjustable serial resonant circuit to the energy-storage units feedback electric energy.
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter and primary side high-frequency converter are all at the state of the zero crossing diverter switch pipe of resonance current, so that switching loss is zero, switching frequency remains identical with series resonance frequency, and the action period of 3 kinds of discrete state of a controls is set as the series resonance cycle half.
The resonant capacitance of described primary side adjustable serial resonant circuit and primary side adjustable serial resonant circuit can be regulated by HF switch, and with 3 kinds of discrete control modes of primary side high-frequency converter and primary side high-frequency converter, be combined, as the control mode of the high accuracy reversible transducer of power storage and circulation.
Described primary side adjustable serial resonant circuit comprises: the leakage inductance of the first resonant capacitor, the second resonant capacitor, the first resonance HF switch, high frequency transformer, the second resonant capacitor is connected with the first resonance HF switch afterwards and the first resonant capacitor parallel connection, and high frequency transformer is connected in series with it.
Further, during the first resonance HF switch conducting, the first resonant capacitor resonant capacitance as primary side adjustable serial resonant circuit in parallel with the second resonant capacitor, the capacity of resonant capacitance increases, harmonic period increases, other conditions are constant, half of harmonic period when 3 kinds of discrete states of primary side high-frequency converter still disconnect by the first resonance HF switch is as the action period, still at the state of the zero crossing diverter switch pipe of resonance current, when a kind of state finishes, next resonance current zero crossing does not also arrive, interval to next resonance current zero crossing, turn-off first, two, three, four HF switch pipes.According to the sine-shaped principle of equal effects, other conditions are constant, the cycle increase will make amplitude reduce, through Equivalent Calculation, the ratio of the capacity sum of the capacity that square equals the first resonant capacitor of the outlet side direct voltage after the first resonance HF switch conducting and outlet side direct voltage ratio before and the capacity of the first resonant capacitor and the second resonant capacitor.
Described primary side adjustable serial resonant circuit comprises: the leakage inductance of the 3rd resonant capacitor, the 4th resonant capacitor, the second resonance HF switch, high frequency transformer, the 4th resonant capacitor is connected with the second resonance HF switch afterwards and the 3rd resonant capacitor parallel connection, and high frequency transformer is connected in series with it.
Further, during the second resonance HF switch conducting, the 3rd resonant capacitor and the 4th resonant capacitor resonant capacitance as primary side adjustable serial resonant circuit in parallel, the capacity of resonant capacitance increases, harmonic period increases, other conditions are constant, half of harmonic period when 3 kinds of discrete states of primary side high-frequency converter still disconnect by the second resonance HF switch is as the action period, still at the state of the zero crossing diverter switch pipe of resonance current, when a kind of state finishes, next resonance current zero crossing does not also arrive, interval to next resonance current zero crossing, turn-off the 5th, six, seven, eight HF switch pipes.According to the sine-shaped principle of equal effects, other conditions are constant, the cycle increase will make amplitude reduce, through Equivalent Calculation, the ratio of the capacity sum of the capacity that square equals the 3rd resonant capacitor of the input side direct voltage after the second resonance HF switch conducting and input side direct voltage ratio before and the capacity of the 3rd resonant capacitor and the 4th resonant capacitor.
Further, the control strategy of 3 kinds of discrete states of primary side high-frequency converter, relatively, set-point is set stagnant ring difference range for outlet side direct voltage and set-point, if the outlet side direct voltage exceeds stagnant ring difference upper limit, next of primary side high-frequency converter discrete state constantly is reverse resonance; If the outlet side direct voltage is lower than stagnant ring difference lower limit, next of primary side high-frequency converter discrete state constantly is forward resonance; If the outlet side direct voltage is in stagnant ring difference range, next of primary side high-frequency converter discrete state constantly is free harmonic vibration.Set-point is to obtain according to the outlet side direct voltage in a upper moment and the final magnitude of voltage of setting; principle is to keep the voltage transformation process level and smooth; if continuous two discrete states are all forward resonance; and next discrete state constantly determines to be still forward resonance; next discrete state constantly is forced to free harmonic vibration so, with protection primary side adjustable serial resonant circuit and HF switch.After the outlet side direct voltage reaches the final magnitude of voltage of setting, conducting the first resonance HF switch, the capacity of resonant capacitor increases, and control strategy is constant, makes the fluctuation of outlet side direct voltage less, precision is higher.
Further, the control strategy of 3 kinds of discrete states of primary side high-frequency converter, relatively, set-point is set stagnant ring difference range for input side direct voltage and set-point, if the input side direct voltage exceeds stagnant ring difference upper limit, next of primary side high-frequency converter discrete state constantly is reverse resonance; If the input side direct voltage is lower than stagnant ring difference lower limit, next of primary side high-frequency converter discrete state constantly is forward resonance; If the input side direct voltage is in stagnant ring difference range, next of primary side high-frequency converter discrete state constantly is free harmonic vibration.Set-point is to obtain according to the input side direct voltage in a upper moment and the final magnitude of voltage of setting; principle is to keep the voltage transformation process level and smooth; if continuous two discrete states are all forward resonance; and next discrete state constantly determines to be still forward resonance; next discrete state constantly is forced to free harmonic vibration so, with protection primary side adjustable serial resonant circuit and HF switch.After the input side direct voltage reaches the final magnitude of voltage of setting, conducting the second resonance HF switch, the capacity of resonant capacitor increases, and control strategy is constant, makes the fluctuation of input side direct voltage less, precision is higher.
Described high frequency transformer is for voltage of transformation, and leakage inductance participates in primary side adjustable serial resonant circuit and primary side series resonant circuit.
Described energy-storage units is storage battery, bank of super capacitors or other types electric energy accumulator part.
Adopt the series resonance soft switch technique, when the direct current of a side is pressed with larger fluctuation, it is stable that the direct voltage of opposite side still can keep, and the amplitude of accommodation of voltage is very large, and reduced switching loss.When the adjustable serial resonant circuit effect of a side, the resonant capacitor of opposite side is for filtering.
The high accuracy reversible transducer of power storage and circulation is controlled needed amount: primary side direct voltage, primary side resonance current, primary side resonant capacitor voltage, primary side resonant capacitor voltage, primary side resonance current and primary side direct voltage.Primary side resonance current and primary side resonance current are respectively the input and output electric currents of high frequency transformer, are linear relationship between the two, sample one of them; Condenser voltage is current related with it, thereby primary side resonant capacitor voltage and primary side resonant capacitor voltage, is also linear relationship between the two, samples one of them.The high accuracy reversible transducer of power storage and circulation is when the charge or discharge state, sampling primary side direct voltage, primary side direct voltage, resonance current and four amounts of resonance condenser voltage, do not increase with respect to the isolated needed sampling quantity of unidirectional DC/DC converter.Synchronization, the high-frequency converter of both sides only need be controlled one, and therefore, the high accuracy reversible transducer of this power storage and circulation can not increase the complexity of its controller and sampling hardware circuit.
Compared with prior art, the present invention has following beneficial effect: the first, voltage transformation amplitude in both sides is large, and the voltage transformation precision is high, energy-storage units quickly-chargeable, electric discharge; The second, during the high-frequency converter inversion based on series resonance soft switch control switch device, reduced switching loss, efficiency is high; Three, the topological structure symmetry of two-way isolated high accuracy DC/DC converter, controlled quentity controlled variable and sampling quantity all have linear relationship, are easy to control.
The accompanying drawing explanation
Fig. 1 is for according to one embodiment of present invention;
The discrete state of a control that Fig. 2 is primary side high-frequency inverter 10 in embodiment, 1 level for the output of primary side high-frequency inverter, 2 is resonance current I
r1, I is forward resonance, and II is reverse resonance, and III is free harmonic vibration, and IV is the first resonance HF switch S
c1forward resonance and free harmonic vibration after conducting, V is the first resonance HF switch S
c1reverse resonance and free harmonic vibration after conducting.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed execution mode and process, but protection scope of the present invention is not limited to following embodiment.Therefore, it should be understood that appended claim is intended to contain all such modifications and the change that falls into true spirit of the present invention.
As shown in Figure 1, the present embodiment comprises: primary side voltage regulation capacitor C
1, primary side high-frequency converter 10, primary side adjustable serial resonant circuit 20, high frequency transformer T
h, primary side adjustable serial resonant circuit 30, primary side high-frequency converter 40, primary side voltage regulation capacitor C
2, energy-storage units, composition successively is linked in sequence.
The high accuracy reversible transducer 100 of described power storage and circulation can make realizing bidirectional electric energy flow, is divided into the charging and discharging two states.When energy-storage units is charged, primary side high-frequency converter 10 is in inverter mode, and primary side adjustable serial resonant circuit 20 is in resonance condition; Primary side high-frequency converter 40 is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit 30 is not worked, and its resonant capacitor is for filtering.During the energy-storage units electric discharge, primary side high-frequency converter 40 is in inverter mode, and primary side adjustable serial resonant circuit 30 is in resonance condition; Primary side high-frequency converter 10 is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit 20 is not worked, and its resonant capacitor is for filtering.
Described primary side high-frequency converter 10 comprises: the first HF switch S
1, the first high-frequency diode D
1, the second HF switch S
2, the second high-frequency diode D
2, third high switch S frequently
3, third high diode D frequently
3, the 4th HF switch S
4, the 4th high-frequency diode D
4.The first HF switch S
1with the first high-frequency diode D
1inverse parallel and the second HF switch S
2with the second high-frequency diode D
2after inverse parallel, be connected in series, third high is switch S frequently
3with third high frequency diode D
3inverse parallel and the 4th HF switch S
4with the 4th high-frequency diode D
4after inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with elementary adjustable serial resonant circuit 20.
As shown in Figure 2, primary side high-frequency converter 10 during for inversion, adopts discrete control mode, pulse voltage direction and the resonance current I of 10 outputs of primary side high-frequency converter
r1direction is identical, to resonance current I
r1play booster action, I is forward resonance; Pulse voltage direction and the resonance current I of 10 outputs of primary side high-frequency converter
r1opposite direction, make resonance current I
r1weaken, II is reverse resonance; Primary side high-frequency converter 10 voltage pulse outputs are zero, to resonance current I
r1without impact, III is free harmonic vibration.
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter 10, same state, resonance current I
r1the corresponding different switch conduction mode of different directions.The switch conduction mode of forward resonance condition is: resonance current I
r1for timing, conducting the first HF switch S
1with the 4th HF switch S
4; Resonance current I
r1when negative, conducting the second HF switch S
2with third high frequency switch S
3.Free harmonic vibration state of switch conduction mode is: resonance current I
r1for timing, conducting the first HF switch S
1or the 4th HF switch S
4, conducting the first HF switch S
1with third high frequency diode D
3make primary side adjustable serial resonant circuit 20 form loop, conducting the 4th HF switch S
4with the second high-frequency diode D
2make primary side adjustable serial resonant circuit 20 form loop; Resonance current I
r1when negative, conducting the second HF switch S
2or third high frequency switch S
3, conducting the second HF switch S
2with the 4th high-frequency diode D
4make primary side adjustable serial resonant circuit 20 form loop, the conducting third high is switch S frequently
3with the first high-frequency diode D
1make primary side adjustable serial resonant circuit 20 form loop.Oppositely the switch conduction mode of resonance condition is: no matter resonance current I
r1be plus or minus, turn-off the first HF switch S
1, the second HF switch S
2, third high switch S frequently
3, the 4th HF switch S
4, as resonance current I
r1for timing, the second high-frequency diode D
2with third high frequency diode D
3conducting makes primary side adjustable serial resonant circuit 20 to primary side high-frequency converter 10 input side feedback electric energy; As resonance current I
r1when negative, the first high-frequency diode D
1with the 4th high-frequency diode D
4conducting makes primary side adjustable serial resonant circuit 20 feedback electric energy of the input side to primary side high-frequency converter 10.
Further, 3 of primary side high-frequency converter 10 kinds of discrete state of a controls are all at resonance current I
r1the state of zero crossing switching HF switch so that switching loss is zero, switching frequency is the primary side series resonance frequency, and the action period of 3 kinds of discrete state of a controls is set as the primary side series resonance cycle half.
Described primary side adjustable serial resonant circuit 20 comprises: the first resonant capacitor C
r1, the second resonant capacitor C
r2, the first resonance HF switch S
c1, resonant inductance is high frequency transformer T
hleakage inductance, the second resonant capacitor C
r2with the first resonance HF switch S
c1rear and the first resonant capacitor C connect
r1parallel connection, resonant inductance, high frequency transformer T
hbe connected in series with it, in the embodiment shown in Fig. 1, resonant inductance is got 1mH, the first resonant capacitor C
r1get 10nF, the second resonant capacitor C
r2get 1000pF, the first resonance HF switch S
c1during shutoff, resonance frequency is 50kHz, the first resonance HF switch S
c1after conducting, resonance frequency is 48kHz.
Further, the first resonance HF switch S
c1during conducting, the first resonant capacitor C
r1with the second resonant capacitor C
r2resonant capacitance as primary side adjustable serial resonant circuit 20 in parallel, the capacity of resonant capacitance increases, and harmonic period increases, and other conditions are constant, and 3 kinds of discrete states of primary side high-frequency converter 10 are still by the first resonance HF switch S
c1half of primary side harmonic period during shutoff is as the action period, still at resonance current I
r1the state of zero crossing diverter switch pipe, next resonance current I when a kind of state finishes
r1zero crossing does not also arrive, and to the interval of next resonance current zero crossing, turn-offs 4 HF switch S of primary side high-frequency converter 10
1, S
2, S
3, S
4, as shown in Figure 2, IV is forward resonance and free harmonic vibration, V is reverse resonance and free harmonic vibration.
3 kinds of discrete state how to confirms of primary side high-frequency converter 10, outlet side direct voltage U
2with set-point U
2comrelatively, set-point U
2comset stagnant ring difference U
d2if, outlet side direct voltage U
2exceed stagnant ring difference upper limit (U
2com+ U
d2), next of primary side high-frequency converter 10 discrete state constantly is reverse resonance; If outlet side direct voltage U
2lower than stagnant ring difference lower limit (U
2com-U
d2), next of primary side high-frequency converter 10 discrete state constantly is forward resonance; If outlet side direct voltage U
2(U in stagnant ring difference range
2com-U
d2~ U
2com+ U
d2), next of primary side high-frequency converter 10 discrete state constantly is free harmonic vibration.Next is set-point U constantly
2com(k) be the outlet side direct voltage U according to a upper moment
2(k-1) with the final magnitude of voltage U set
2setobtain: r
2[U
2set– U
2(k-1)]+U
2(k-1), r
2for change in voltage coefficient, span 0.05 ~ 0.1, outlet side direct voltage U
2reach the final magnitude of voltage U of setting
2set95% after, next is set-point U constantly
2comfor U
2setif continuous two discrete states are all forward resonance, and next discrete state constantly determines to be still forward resonance, and next discrete state constantly is forced to free harmonic vibration so.
Further, outlet side direct voltage U
2reach the final magnitude of voltage U of setting
2setafter, keep the first resonance HF switch S
c1for conducting state, the capacity of resonant capacitor increases, and control strategy is constant, the first resonance HF switch S
c1outlet side direct voltage after conducting and DC side output voltage ratio before square equal the first resonant capacitor C
r1capacity and the first resonant capacitor C
r1capacity and the second resonant capacitor C
r2the ratio of capacity sum.
Described primary side high-frequency converter 40 comprises: the 5th HF switch S
5, the 5th high-frequency diode D
5, the 6th HF switch S
6, the 6th high-frequency diode D
6, the 7th HF switch S
7, the 7th high-frequency diode D
7, the 8th HF switch S
8, the 8th high-frequency diode D
8.The 5th HF switch S
5with the 5th high-frequency diode D
5inverse parallel and the 6th HF switch S
6with the 6th high-frequency diode D
6be connected in series the 7th HF switch S after inverse parallel
7with the 7th high-frequency diode D
7inverse parallel and the 8th HF switch S
8with the 8th high-frequency diode D
8after inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with secondary adjustable serial resonant circuit 30.
Primary side high-frequency converter 40 during for inversion, adopts discrete control mode, pulse voltage direction and the resonance current I of 40 outputs of primary side high-frequency converter
r2direction is identical, to resonance current I
r2playing booster action, is forward resonance; Pulse voltage direction and the resonance current I of 40 outputs of primary side high-frequency converter
r2opposite direction, make resonance current I
r2weakening, is reverse resonance; Primary side high-frequency converter 40 voltage pulse outputs are zero, to resonance current I
r2without impact, it is free harmonic vibration.
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter 40, same state, resonance current I
r2the corresponding different switch conduction mode of different directions.The switch conduction mode of forward resonance condition is: resonance current I
r2for timing, conducting the 5th HF switch S
5with the 8th HF switch S
8; Resonance current I
r2when negative, conducting the 6th HF switch S
6with the 7th HF switch S
7.Free harmonic vibration state of switch conduction mode is: resonance current I
r2for timing, conducting the 5th HF switch S
5or the 8th HF switch S
8, conducting the 5th HF switch S
5with the 7th high-frequency diode D
7make primary side adjustable serial resonant circuit 30 form loop, conducting the 8th HF switch S
8with the 6th high-frequency diode D
6make primary side adjustable serial resonant circuit 30 form loop; Resonance current I
r2when negative, conducting the 6th HF switch S
6or the 7th HF switch S
7, conducting the 6th HF switch S
6with the 8th high-frequency diode D
8make primary side adjustable serial resonant circuit 30 form loop, conducting the 7th HF switch S
7with the 5th high-frequency diode D
5make primary side adjustable serial resonant circuit 30 form loop.Oppositely the switch conduction mode of resonance condition is: no matter resonance current I
r2be plus or minus, turn-off the 5th HF switch S
5, the 6th HF switch S
6, the 7th HF switch S
7, the 8th HF switch S
8, as resonance current I
r2for timing, the 6th high-frequency diode D
6with the 7th high-frequency diode D
7conducting makes primary side adjustable serial resonant circuit 30 to primary side high-frequency converter 40 input side feedback electric energy; As resonance current I
r2when negative, the 5th high-frequency diode D
5with the 8th high-frequency diode D
8conducting makes primary side adjustable serial resonant circuit 30 feedback electric energy of the input side to primary side high-frequency converter 40.
Further, 3 of primary side high-frequency converter 40 kinds of discrete state of a controls are all at resonance current I
r2the state of zero crossing switching HF switch so that switching loss is zero, switching frequency is the primary side series resonance frequency, and the action period of 3 kinds of discrete state of a controls is set as the primary side series resonance cycle half.
Described primary side adjustable serial resonant circuit 30 comprises: the 3rd resonant capacitor C
r3, the 4th resonant capacitor C
r4, the second resonance HF switch S
c2, resonant inductance is high frequency transformer T
hleakage inductance, the 4th resonant capacitor C
r4with the second resonance HF switch S
c2rear and the 3rd resonant capacitor C connect
r3parallel connection, high frequency transformer T
hbe connected in series with it, in the embodiment shown in Fig. 1, resonant inductance is got 1mH, the 3rd resonant capacitor C
r3get 16nF, the 4th resonant capacitor C
r4get 800pF, the second resonance HF switch S
c2during shutoff, resonance frequency is 39.8kHz, the second resonance HF switch S
c2after conducting, resonance frequency is 38.85kHz.
Further, the second resonance HF switch S
c2during conducting, the 3rd resonant capacitor C
r3with the 4th resonant capacitor C
r4resonant capacitance as primary side adjustable serial resonant circuit 30 in parallel, the capacity of resonant capacitance increases, and harmonic period increases, and other conditions are constant, and 3 kinds of discrete states of primary side high-frequency converter 40 are still by the second resonance HF switch S
c2half of primary side harmonic period during shutoff is as the action period, still at resonance current I
r2the state of zero crossing diverter switch pipe, next resonance current I when a kind of state finishes
r2zero crossing does not also arrive, and to the interval of next resonance current zero crossing, turn-offs 4 HF switch S of primary side high-frequency converter 40
5, S
6, S
7, S
8.
3 kinds of discrete state how to confirms of primary side high-frequency converter 40, input side direct voltage U
1with set-point U
1comrelatively, set-point U
1comset stagnant ring difference U
d1if, input side direct voltage U
1exceed stagnant ring difference upper limit (U
1com+ U
d1), next of primary side high-frequency converter 40 discrete state constantly is reverse resonance; If input side direct voltage U
1lower than stagnant ring difference lower limit (U
1com-U
d1), next of primary side high-frequency converter 40 discrete state constantly is forward resonance; If input side direct voltage U
1(U in stagnant ring difference range
1com-U
d1~ U
1com+ U
d1), next of primary side high-frequency converter 40 discrete state constantly is free harmonic vibration.Next is set-point U constantly
1com(k) be the outlet side direct voltage U according to a upper moment
1(k-1) with the final magnitude of voltage U set
1setobtain: r
1[U
1set– U
1(k-1)]+U
1(k-1), r
1for change in voltage coefficient, span 0.05 ~ 0.1, input side direct voltage U
1reach the final magnitude of voltage U of setting
1set95% after, next is set-point U constantly
1comfor U
1setif continuous two discrete states are all forward resonance, and next discrete state constantly determines to be still forward resonance, and next discrete state constantly is forced to free harmonic vibration so.
Further, input side direct voltage U
1reach the final magnitude of voltage U of setting
1setafter, keep the second resonance HF switch S
c2for conducting state, the capacity of resonant capacitor increases, and control strategy is constant, the second resonance HF switch S
c2input side direct voltage after conducting and DC side input voltage ratio before square equal the 3rd resonant capacitor C
r3capacity and the 3rd resonant capacitor C
r3capacity and the 4th resonant capacitor C
r4the ratio of capacity sum.
The high accuracy reversible transducer 100 of power storage and circulation is controlled needed amount and is: primary side direct voltage U
1, primary side resonance current I
r1, the primary side resonant capacitor voltage U
c1, the primary side resonant capacitor voltage U
c2, primary side resonance current I
r2with primary side direct voltage U
2.Primary side resonance current I
r1with primary side resonance current I
r2respectively high frequency transformer T
hthe input and output electric current, be linear relationship between the two, can only sample one of them; The voltage of capacitor is current related with it, thereby the voltage U of primary side resonant capacitor
c1voltage U with the primary side resonant capacitor
c2, be also linear relationship between the two, can sample one of them.The high accuracy reversible transducer 100 of power storage and circulation, when the charge or discharge state, only needs sampling primary side direct voltage U
1, primary side direct voltage U
2, the resonance current of one of them and four amounts of resonance condenser voltage, with respect to the isolated needed sampling quantity of unidirectional DC/DC converter, do not increase.Synchronization, the high-frequency converter of both sides only need be controlled one, and therefore, the high accuracy reversible transducer 100 of this power storage and circulation can not increase the complexity of its controller and sampling hardware circuit.
Claims (8)
1. the high accuracy reversible transducer of a power storage and circulation, it is characterized in that comprising: primary side voltage regulation capacitor, primary side high-frequency converter, primary side adjustable serial resonant circuit, high frequency transformer, primary side adjustable serial resonant circuit, primary side high-frequency converter, primary side voltage regulation capacitor, energy-storage units, composition successively is linked in sequence;
The high accuracy reversible transducer of described power storage and circulation can make realizing bidirectional electric energy flow, is divided into the charging and discharging two states; When energy-storage units is charged, the primary side high-frequency converter is in inverter mode, and primary side adjustable serial resonant circuit is in resonance condition; The primary side high-frequency converter is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit is not worked, and its resonant capacitor is for filtering; During the energy-storage units electric discharge, the primary side high-frequency converter is in inverter mode, and primary side adjustable serial resonant circuit is in resonance condition; The primary side high-frequency converter is in rectification state, and four switching devices keep turn-offing, four fast diode effects, and primary side adjustable serial resonant circuit is not worked, and its resonant capacitor is for filtering;
Described primary side voltage regulation capacitor and primary side voltage regulation capacitor are respectively used to stablize primary side direct voltage and primary side direct voltage;
When described primary side high-frequency converter and primary side high-frequency converter are used for inversion, adopt the discrete control mode of identical high-frequency converter, the different conduction mode according to switching tube, the output of primary side high-frequency converter and primary side high-frequency converter has three state, is referred to as forward resonance, free harmonic vibration and reverse resonance; Forward resonance is that the pulse voltage direction of primary side high-frequency converter or the output of primary side high-frequency converter is identical with direction of resonant current, and resonance current is played to booster action, is referred to as forward resonance; Primary side high-frequency converter or primary side high-frequency converter voltage pulse output are zero, and resonance current, without impact, is referred to as to free harmonic vibration; The pulse voltage direction of primary side high-frequency converter or the output of primary side high-frequency converter is contrary with direction of resonant current, makes resonance current weaken, and is referred to as reverse resonance;
Further, 3 kinds of discrete state of a controls of primary side high-frequency converter and primary side high-frequency converter are all at the state of the zero crossing diverter switch pipe of resonance current, so that switching loss is zero, switching frequency remains identical with series resonance frequency, and the action period of 3 kinds of discrete state of a controls is set as the series resonance cycle half;
The resonant capacitance of described primary side adjustable serial resonant circuit and primary side adjustable serial resonant circuit can be regulated by HF switch, and with 3 kinds of discrete control modes of primary side high-frequency converter and primary side high-frequency converter, be combined, as the control mode of the high accuracy reversible transducer of power storage and circulation;
Described high frequency transformer is for voltage of transformation, and leakage inductance participates in primary side adjustable serial resonant circuit and primary side series resonant circuit.
2. the high accuracy reversible transducer of power storage according to claim 1 and circulation, it is characterized in that, the primary side high-frequency converter comprises: the first HF switch, the first high-frequency diode, the second HF switch, the second high-frequency diode, third high be switch, third high frequency diode, the 4th HF switch, the 4th high-frequency diode frequently; After the first HF switch and the first high-frequency diode inverse parallel and the second HF switch and the second high-frequency diode inverse parallel, be connected in series, after third high frequency switch and third high diode inverse parallel frequently and the 4th HF switch and the 4th high-frequency diode inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with elementary adjustable serial resonant circuit; The primary side high-frequency converter comprises: the 5th HF switch, the 5th high-frequency diode, the 6th HF switch, the 6th high-frequency diode, the 7th HF switch, the 7th high-frequency diode, the 8th HF switch, the 8th high-frequency diode; After the 5th HF switch and the 5th high-frequency diode inverse parallel and the 6th HF switch and the 6th high-frequency diode inverse parallel, be connected in series, after the 7th HF switch and the 7th high-frequency diode inverse parallel and the 8th HF switch and the 8th high-frequency diode inverse parallel, be connected in series, above-mentioned both are connected in parallel, and two are connected in series a little and are connected with secondary adjustable serial resonant circuit.
3. the high accuracy reversible transducer of power storage according to claim 1 and circulation, is characterized in that, 3 kinds of discrete state of a controls of primary side high-frequency converter, same state, the switch conduction mode that the different directions of resonance current is corresponding different; The switch conduction mode of forward resonance condition is: resonance current is timing, conducting the first HF switch and the 4th HF switch; When resonance current is negative, conducting the second HF switch and third high be switch frequently; Free harmonic vibration state of switch conduction mode is: resonance current is timing, conducting the first HF switch or the 4th HF switch, conducting the first HF switch and third high diode frequently make primary side adjustable serial resonant circuit form loop, and conducting the 4th HF switch and the second high-frequency diode make primary side adjustable serial resonant circuit form loop; When resonance current is negative, conducting the second HF switch or third high be switch frequently, conducting the second HF switch and the 4th high-frequency diode make primary side adjustable serial resonant circuit form loop, and conducting third high frequency switch and the first high-frequency diode make primary side adjustable serial resonant circuit form loop; Oppositely the switch conduction mode of resonance condition is: no matter resonance current is plus or minus, turn-off the first HF switch, the second HF switch, third high switch, the 4th HF switch frequently, when resonance current is timing, the second high-frequency diode and third high diode current flow frequently make primary side adjustable serial resonant circuit to elementary survey high-frequency converter input side feedback electric energy; When resonance current, when negative, the first high-frequency diode and the 4th high-frequency diode conducting make the input side feedback electric energy of primary side adjustable serial resonant circuit to the primary side high-frequency converter.
4. the high accuracy reversible transducer of power storage according to claim 1 and circulation, is characterized in that, 3 kinds of discrete state of a controls of primary side high-frequency converter, same state, the switch conduction mode that the different directions of resonance current is corresponding different; The switch conduction mode of forward resonance condition is: resonance current is timing, conducting the 5th HF switch and the 8th HF switch; When resonance current is negative, conducting the 6th HF switch and the 7th HF switch; Free harmonic vibration state of switch conduction mode is: resonance current is timing, conducting the 5th HF switch or the 8th HF switch, conducting the 5th HF switch and the 7th high-frequency diode make primary side adjustable serial resonant circuit form loop, and conducting the 8th HF switch and the 6th high-frequency diode make primary side adjustable serial resonant circuit form loop; When resonance current is negative, conducting the 6th HF switch or the 7th HF switch, conducting the 6th HF switch and the 8th high-frequency diode make the primary side series resonant circuit form loop, and conducting the 7th HF switch and the 5th high-frequency diode make the primary side series resonant circuit form loop; Oppositely the switch conduction mode of resonance condition is: no matter resonance current is plus or minus, turn-off the 5th, six, seven, eight HF switch, when resonance current is timing, the 6th high-frequency diode and the 7th high-frequency diode conducting make primary side adjustable serial resonant circuit to the energy-storage units feedback electric energy; When resonance current, when negative, the 5th high-frequency diode and the 8th high-frequency diode conducting make primary side adjustable serial resonant circuit to the energy-storage units feedback electric energy.
5. the high accuracy reversible transducer of power storage according to claim 1 and circulation, it is characterized in that, primary side adjustable serial resonant circuit comprises: the leakage inductance of the first resonant capacitor, the second resonant capacitor, the first resonance HF switch, high frequency transformer, the second resonant capacitor is connected with the first resonance HF switch afterwards and the first resonant capacitor parallel connection, and high frequency transformer is connected in series with it, during the first resonance HF switch conducting, the first resonant capacitor resonant capacitance as primary side adjustable serial resonant circuit in parallel with the second resonant capacitor, the capacity of resonant capacitance increases, harmonic period increases, other conditions are constant, half of harmonic period when 3 kinds of discrete states of primary side high-frequency converter still disconnect by the first resonance HF switch is as the action period, still at the state of the zero crossing diverter switch pipe of resonance current, when a kind of state finishes, next resonance current zero crossing does not also arrive, interval to next resonance current zero crossing, turn-off first, two, three, four HF switch pipes.
6. the high accuracy reversible transducer of power storage according to claim 1 and circulation, it is characterized in that, primary side adjustable serial resonant circuit comprises: the leakage inductance of the 3rd resonant capacitor, the 4th resonant capacitor, the second resonance HF switch, high frequency transformer, the 4th resonant capacitor is connected with the second resonance HF switch afterwards and the 3rd resonant capacitor parallel connection, and high frequency transformer is connected in series with it, during the second resonance HF switch conducting, the 3rd resonant capacitor and the 4th resonant capacitor resonant capacitance as primary side adjustable serial resonant circuit in parallel, the capacity of resonant capacitance increases, harmonic period increases, other conditions are constant, half of harmonic period when 3 kinds of discrete states of primary side high-frequency converter still disconnect by the second resonance HF switch is as the action period, still at the state of the zero crossing diverter switch pipe of resonance current, when a kind of state finishes, next resonance current zero crossing does not also arrive, interval to next resonance current zero crossing, turn-off the 5th, six, seven, eight HF switch pipes.
7. the high accuracy reversible transducer of power storage according to claim 1 and circulation, it is characterized in that, the control strategy of 3 kinds of discrete states of primary side high-frequency converter, outlet side direct voltage and set-point are relatively, set-point is set stagnant ring difference range, if the outlet side direct voltage exceeds stagnant ring difference upper limit, next of primary side high-frequency converter discrete state constantly is reverse resonance; If the outlet side direct voltage is lower than stagnant ring difference lower limit, next of primary side high-frequency converter discrete state constantly is forward resonance; If the outlet side direct voltage is in stagnant ring difference range, next of primary side high-frequency converter discrete state constantly is free harmonic vibration; If continuous two discrete states are all forward resonance, and next discrete state constantly determines to be still forward resonance, and next discrete state constantly is forced to free harmonic vibration so; After the outlet side direct voltage reaches the final magnitude of voltage of setting, conducting the first resonance HF switch.
8. the high accuracy reversible transducer of power storage according to claim 1 and circulation, it is characterized in that, the control strategy of 3 kinds of discrete states of primary side high-frequency converter, input side direct voltage and set-point are relatively, set-point is set stagnant ring difference range, if the input side direct voltage exceeds stagnant ring difference upper limit, next of primary side high-frequency converter discrete state constantly is reverse resonance; If the input side direct voltage is lower than stagnant ring difference lower limit, next of primary side high-frequency converter discrete state constantly is forward resonance; If the input side direct voltage is in stagnant ring difference range, next of primary side high-frequency converter discrete state constantly is free harmonic vibration; If continuous two discrete states are all forward resonance, and next discrete state constantly determines to be still forward resonance, and next discrete state constantly is forced to free harmonic vibration so; After the input side direct voltage reaches the final magnitude of voltage of setting, conducting the second resonance HF switch.
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