CN103326589A - Multi-stage Boost type cascade boosting power device and control method thereof - Google Patents
Multi-stage Boost type cascade boosting power device and control method thereof Download PDFInfo
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Abstract
The invention relates to a control method of a multi-stage Boost type cascade boosting power device. The power device comprises an AC/DC converting unit, a DC/DC converting unit, a DC/AC converting unit, a DC bus capacitor, a first boosting inductor and a charge-boosting unit, wherein the DC bus capacitor is used for storing direct current electric energy output by the AC/DC converting unit, the first boosting inductor is used for storing energy converted by the AC/DC converting unit and then releasing the energy to the DC bus capacitor, and the charge-boosting unit is used for charging a battery and boosting the electric energy provided by the battery. According to the control method, in an online mode, the charge-boosting unit is connected at the two ends of the DC bus capacitor by a control switch element through a third boosting inductor, and the battery is charged with the energy of the DC bus capacitor through the charge-boosting unit; in a battery mode, the charge-boosting unit is connected at the two ends of a full-bridge rectifier of the DC/AC converting unit by the control switch element, multi-stage boost is carried out on the energy provided by the battery, and then energy is provided for the DC bus capacitor.
Description
Technical field
The present invention relates to field of power supplies, more particularly, relate to multistage Boost cascade boosting power device and control method thereof.
Background technology
At present, supply unit is generally used for ensureing that various power consumption equipments work on a period of time after having a power failure, so that the user can carry out emergency treatment, for example in computer realm, the user can preserve data timely, makes the user can not influence work or obliterated data because of power failure.Supply unit can be used as emergency power supply to use in various practical applications such as computer system, network and communication system, prevents outage suddenly and influences operate as normal, causes damage to system.
In order to promote competitiveness of product, reduce volume and increase the development trend that power density has become UPS.And in the on line type UPS product of 1 to 3KVA present power section, the DC/DC boost module of battery is normally used to be push-pull topology, and conversion efficiency is generally lower; When battery mode, it needs a charger to come to be battery charge on the other hand, and this charger module has just increased the volume of product greatly.In order to improve present case, we have designed a kind of new topology one multistage Boost cascade booster circuit, namely adopt a plurality of Boost circuit to carry out cascade and finish and boost, available it replace push-pull topology.Use new topology simultaneously, we, can realize battery charge because this circuit possesses the translation function of two-way DC/DC not in the extra charger module of needs.
On line type UPS power supply product for 1 to 3KVA power section, the joint number that the battery series connection is used is less, cause DC bus-bar voltage more many than battery total voltage eminence, recently finish the conversion of DC/DC so need higher boosting, be difficult to meet the demands if adopt single-stage Boost circuit to finish to boost, so we consider to use two-stage even multi-stage booster circuit solves this problem.This circuit can play the normal boosting of DC/DC in battery mode, and can realize that in line model the function of charger charges to battery, so it has saved extra charger, like this for we reduce that volume provides may; In addition, it is less relatively that the used device of new topology contrasts push-pull topology, possesses higher system effectiveness and lower design cost simultaneously.
Summary of the invention
For realizing aforementioned purpose, the invention provides a kind of control method of multistage Boost cascade boosting power device, described supply unit comprises: the ac/dc converting unit, input connects alternating current input power supplying, and AC power is converted to DC power supply; The DC/DC conversion unit, its input connects the output of described ac/dc converting unit, converts direct-current input power supplying to specific DC power supply; The AC/DC converting unit, its input connects the output of described DC/DC conversion unit, converts DC power supply to required interchange out-put supply; Dc-link capacitance is connected between described DC/DC conversion unit and the AC/DC converting unit, is used for storing the direct current energy that the DC/DC conversion unit is exported; The charging boosting unit, be connected to described supply unit by switch element, be used for boosting to battery charge and to the electric energy that battery provides, it is characterized in that, described method comprises: in the time of in being in ray mode, the control switch element boosting unit that will charge is connected the two ends of dc-link capacitance via the 3rd boost inductance L5, utilize the energy of dc-link capacitance to pass through the charging boosting unit to battery charge, perhaps be connected to the output of ac/dc converting unit, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge; And in being in battery mode the time, the control switch element boosting unit that will charge is connected the input of DC/DC conversion unit, and the energy that battery is provided carries out multistage boosting, thereby provides energy for dc-link capacitance.
Preferably, in the time of in being in ray mode, the energy that utilizes dc-link capacitance comprises battery charge by the charging boosting unit: the charging boosting unit is operated in the step-down mode of operation, after the direct current energy step-down that is stored by dc-link capacitance to battery charge.
Preferably, in the time of in being in ray mode, the output energy that utilizes the ac/dc converting unit, comprising battery charge by the charging boosting unit: the charging boosting unit is operated in the step-down mode of operation, by after the output commutation capacitor step-down of ac/dc converting unit to battery charge.
Preferably, in the time of in being in battery mode, the energy that battery is provided carries out multistage boosting and comprises: by the charging boosting unit energy that battery provides is boosted for the first time, carry out secondary booster by the DC/DC conversion unit then.
Preferably, the charging boosting unit comprises second boost inductance, the 3rd power switch pipe and boost capacitor, the energy that battery is provided boosts for the first time and comprises: this power switch pipe conducting makes battery that energy is offered this second boost inductance, then closes this power switch pipe and makes battery and this second boost inductance provide energy for this boost capacitor.
Preferably, described DC/DC conversion unit comprises: first boost inductance and first power switch pipe, carrying out secondary booster by the DC/DC conversion unit comprises: this power switch pipe conducting makes aforementioned boost capacitor provide energy by switch element for first boost inductance, close this power switch pipe then, provide energy by this boost capacitor and first boost inductance for dc-link capacitance.
The invention provides a kind of multistage Boost cascade boosting power device, described supply unit comprises: the ac/dc converting unit, and input connects alternating current input power supplying, and AC power is converted to DC power supply; The DC/DC conversion unit, its input connects the output of described ac/dc converting unit, converts direct-current input power supplying to specific DC power supply; The AC/DC converting unit, its input connects the output of described DC/DC conversion unit, converts DC power supply to required interchange out-put supply; Dc-link capacitance is connected between described DC/DC conversion unit and the AC/DC converting unit, is used for storing the direct current energy that the DC/DC conversion unit is exported; And the charging boosting unit, be connected to described supply unit by switch element, be used for boosting to battery charge and to the electric energy that battery provides; Wherein, in the time of in being in ray mode, the supply unit control switch element boosting unit that will charge is connected the two ends of dc-link capacitance via the 3rd boost inductance, utilize the energy of dc-link capacitance to pass through the charging boosting unit to battery charge, perhaps be connected to the output of ac/dc converting unit, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge; And in being in battery mode the time, the supply unit control switch element boosting unit that will charge is connected the input of DC/DC conversion unit, and the energy that battery is provided carries out multistage boosting, thereby provides energy for dc-link capacitance.
Preferably, in the time of in being in ray mode, the energy that supply unit utilizes dc-link capacitance comprises battery charge by the charging boosting unit: the charging boosting unit is operated in the step-down mode of operation, after the direct current energy step-down that is stored by dc-link capacitance to battery charge.
Preferably, in the time of in being in ray mode, supply unit utilizes the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge, comprise: the charging boosting unit be operated in the step-down mode of operation, by after the output commutation capacitor step-down of ac/dc converting unit to battery charge.
Preferably, in the time of in being in battery mode, the energy that supply unit provides battery carries out multistage boosting and comprises: by the charging boosting unit energy that battery provides is boosted for the first time, carry out secondary booster by the DC/DC conversion unit then.
Preferably, the charging boosting unit comprises second boost inductance, the 3rd power switch pipe and boost capacitor, the energy that battery is provided boosts for the first time and comprises: this power switch pipe conducting makes battery that energy is offered this second boost inductance, then closes this power switch pipe and makes battery and this second boost inductance provide energy for boost capacitor.
Preferably, described DC/DC conversion unit comprises: first boost inductance and first power switch pipe, carrying out secondary booster by the DC/DC conversion unit comprises: this power switch pipe conducting makes aforementioned boost capacitor provide energy by switch element for first boost inductance, close this power switch pipe then, provide energy by this boost capacitor and first boost inductance for dc-link capacitance.
Preferably, the charging boosting unit comprises: switch element, boost capacitor, second power switch pipe, the 3rd power switch pipe, second boost inductance and battery, and specifically annexation is,
The control switch element boosting unit that will charge is connected on the two ends of dc-link capacitance, switch element is connected to an end of dc-link capacitance via the 3rd boost inductance, switch element connects an end of boost capacitor and connects the collector electrode of second power switch pipe, the other end of boost capacitor connects the other end of dc-link capacitance, the emitter of the 3rd power switch pipe, the emitter of battery cathode and first power switch pipe, the emitter of second power switch pipe connects an end of second boost inductance and the collector electrode of the 3rd power switch pipe, and the other end of second boost inductance connects anode; Perhaps
The control switch element boosting unit that will charge is connected on the input of DC/DC conversion unit, switch element is connected to the collector electrode of first power switch pipe and the anode of dc bus diode via first boost inductance, the negative electrode of dc bus diode is connected to an end of dc-link capacitance, switch element connects an end of boost capacitor, the other end of boost capacitor connects the other end of dc-link capacitance, the emitter of the 3rd power switch pipe, the emitter of battery cathode and first power switch pipe, switch element connects the collector electrode of second power switch pipe, the emitter of second power switch pipe connects an end of second boost inductance and the collector electrode of the 3rd power switch pipe, and the other end of second boost inductance connects anode.
Description of drawings
Below the present invention is described in detail by reference to the accompanying drawings, its purpose, advantage and other novel characteristics will become more obvious like this.
Fig. 1 is the structural representation of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device;
Fig. 2 is the circuit operation figure of the AC/DC of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under line model;
Fig. 3 is the positive half period circuit operation figure of the DC/AC of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under line model;
Fig. 4 is the negative half-cycle circuit operation figure of the DC/AC of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under line model;
Fig. 5 is that multistage according to the preferred embodiment of the present invention Boost cascade boosting power device is the circuit operation figure of battery charge under line model;
The circuit operation figure that Fig. 6 boosts for the first order of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under battery mode;
The circuit operation figure that Fig. 7 boosts for the second level of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under battery mode; And
Fig. 8 is the circuit operation figure of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under bypass mode.
Reference numeral
Q1 to Q7 has the power switch pipe of body diode
L1 first boost inductance
The L2 first inversion inductance
The L3 second inversion inductance
L4 second boost inductance
L5 the 3rd boost inductance
The C1 dc-link capacitance
The C2 boost capacitor
C3 inversion electric capacity
The C4 commutation capacitor
The BAT battery
D1 dc bus diode
Embodiment
With reference now to accompanying drawing, introduces illustrative embodiments of the present invention, yet, the present invention can implement with many different forms, and be not limited to embodiment described herein, it is for openly the present invention at large and fully that these embodiment are provided, and fully passes on scope of the present invention to the person of ordinary skill in the field.Be not limitation of the invention for the term in the accompanying drawings the illustrative embodiments of expression.In the accompanying drawings, identical cells/elements is used identical Reference numeral.
Except as otherwise noted, " ", " ", " described " and " being somebody's turn to do " of herein using also comprises plural form.In addition, should be understood that, the term that uses in this specification " comprises ", " comprising " and/or " containing ", specified some features, entity, step, operation, unit and/or element, but the group of not getting rid of one or more features, entity, step, operation, unit, element and/or being formed by them.Should be understood that when the unit is called as " connection " or " coupling " when another unit, it can be directly to be connected with another unit or to be coupled, and also can have temporary location.In addition, " connection " of indication or " coupling " comprise wireless connections or coupling herein.Herein the term of Shi Yonging " and/or " comprise the combination in any of or above listed relevant item and all combinations.
Except as otherwise noted, the term (comprising scientific and technical terminology) that herein uses has the common implication of understanding to the person of ordinary skill in the field.In addition, be understandable that the term so that normally used dictionary limits is appreciated that with the linguistic context of its association area to have consistent implication, and should be understood that Utopian or too formal meaning.
At first, learn about the structural representation of this supply unit earlier, shown in Fig. 1 was, it was the structural representation of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device.This supply unit comprises: ac/dc converting unit A, DC/DC conversion unit B, AC/DC converting unit C and charging boosting unit D.Respectively the 26S Proteasome Structure and Function of these four unit is described below:
1, ac/dc converting unit
Formed by full-bridge rectifier and commutation capacitor C4; Its input connects the alternating current input power supplying device, is provided by described alternating current input power supplying device to exchange input.In addition, the input of full-bridge rectifier is connected to the electromagnetic interface filter (being IPEMI) of input power supply by the relay (being IP Relay) of input power supply.Preferably, the two ends of commutation capacitor C4 are connected to the output of full-bridge rectifier.
2, DC/DC conversion unit
Formed by the first boost inductance L1, the first power switch pipe Q1, the dc bus diode D1 and the dc-link capacitance C1 that have a body diode, also can be called simple single-stage Boost circuit.When the first power switch pipe Q1 conducting, aforementioned commutation capacitor C4 is that the first boost inductance L1 carries out the storage of energy, when the first power switch pipe Q1 turn-offs, dc bus diode D1 conducting, aforementioned commutation capacitor C4 and the first boost inductance L1 are dc-link capacitance C1 charging, and this has just realized simple DC/DC conversion.
3, AC/DC converting unit
This element also can be called full bridge inverter in the present embodiment, and it comprises power switch pipe Q2, Q3, Q4 and the Q5 that has body diode, the first inversion inductance L 2 and the second inversion inductance L 3, and inversion capacitor C 3.Wherein power switch pipe Q2, Q3 and Q4, Q5 constitute two brachium pontis of full bridge inverter respectively, and these four power switch pipes all have body diode.The output that is input as previous stage DC/DC conversion unit B of AC/DC converting unit is about to dc-link capacitance as input, and it is realized the conversion of direct current to alternating current.
4, charging boosting unit
This unit comprises the second power switch pipe Q6 that has body diode and the 3rd power switch pipe Q7, the second boost inductance L4, singly throws switch element (being SWITCH), boost capacitor C2 and the battery BAT of double-pole.Preferably, described switch element can be battery relay (BAT Relay).The charging boosting unit is emphasis of the present invention, this unit has two functions, one of them function is that it can be finished and is under the battery mode, provide electric energy to carry out boosting the first time by battery, after cooperating aforementioned AC/DC converting unit to carry out boosting the second time again, dc-link capacitance C1 is charged; And another function is when being in the ray mode, to be battery charge, also is the function that this circuit possesses bidirectional, dc/direct current conversion.
The concrete annexation of described charging boosting unit is: switch element is connected the output of full-bridge rectifier or is connected to the end of dc-link capacitance C1 via the 3rd boost inductance L5, thereby control charging boosting unit connects the output of full-bridge rectifier, or is connected to the end of dc-link capacitance C1 via the 3rd boost inductance L5.Switch element connects an end of boost capacitor, and the other end of boost capacitor C2 connects the other end of dc-link capacitance C1, emitter and the battery cathode of the 3rd power switch pipe Q7; Switch element connects the collector electrode of the second power switch pipe Q6, and the emitter of the second power switch pipe Q6 connects the end of the second boost inductance L4 and the collector electrode of the 3rd power switch pipe Q7, and the other end of the second boost inductance L4 connects anode.
In the time of in being in ray mode, the control switch element boosting unit that will charge is connected the two ends of dc-link capacitance C1 via the 3rd boost inductance L5, utilize the energy of dc-link capacitance C1 to pass through the charging boosting unit to battery charge, perhaps be connected to the output of ac/dc converting unit, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge.
In the time of in being in battery mode, the control switch element boosting unit that will charge is connected on the input of DC/DC conversion unit, and the energy that battery is provided carries out multistage boosting, thereby provides energy for dc-link capacitance C1.
When the charging boosting unit was realized boost function, system controlled the end that this switch element is connected to the first boost inductance L1.By second boost L4, the 3rd power switch pipe Q7, the body diode of boost capacitor C2 and the second power switch pipe Q6 is formed first order Boost circuit, and battery (BAT) is as the input of first order Boost circuit.When system controls the 3rd power switch pipe Q7 conducting, battery offers the second boost inductance L4 with energy, when the 3rd power switch pipe Q7 turn-offed then, battery and the second boost inductance L4 provided energy via the body diode of the second power switch pipe Q6 for boost capacitor C2.Thereby, be boost capacitor C2 charging, realize the first order boost function of circuit, then the first boost inductance L1, the first power switch pipe Q1, dc bus diode D1 and the dc-link capacitance C1 by the DC/DC conversion unit forms second level Boost circuit.Boost capacitor C2 is dc-link capacitance C1 charging as input, thereby finishes the last boost function of circuit;
When the charging boosting unit is realized charge function, system controls the end that this switch element is connected to the 3rd boost inductance L5, this moment, dc-link capacitance C1 provided energy for boost capacitor C2, body diode by the second power switch pipe Q6, the second boost inductance L4, battery BAT and the 3rd power switch pipe Q7 is formed the BUCK circuit, is reduction voltage circuit.Boost capacitor C2 is as input, thereby is embodied as the function of battery charge.Clearly, the first order Boost circuit the when circuit multiplexer during charging boosts, just there is change in the part of devices on off state, that is to say that there is the bi-directional conversion function in circuit.
In addition, except four unit described above, described supply unit also comprises alternating current input power supplying device IP and exchanges output power supply device OP etc.Input unit is made up of input filter (being IP EMI) and input relay (being IP Relay), effects such as the input of realization AC power and filtering; And output device is made up of bypass relay (being BYP Relay) and output filter (being OP EMI) etc., finishes functions such as the filtering of AC power and output.
Secondly, after the structure to supply unit of the present invention has certain understanding, then introduce the circuit operation about it, can be divided into following several modes according to the situation of alternating current input power supplying and describe, describe below in conjunction with preferred implementation of the present invention:
One, line model (Line Mode)
The present invention is directed to extra charger and make the excessive and single-stage booster circuit of the volume of supply unit be difficult to satisfy to boost the problem that requires etc., proposed a kind of topological structure of multistage Boost cascade boosting power device.According to preferred implementation of the present invention, a kind of multi-stage booster circuit is provided, and described circuit plays multistage effect of boosting in battery mode, uses the joint number of battery series connection less, and can finish in line model battery is charged, so it has saved extra charger.
During line model, AC/DC circuit operation figure as shown in Figure 2, Fig. 2 is the circuit operation figure of the AC/DC of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under line model.The charging boosting unit be operated in the step-down mode of operation, by after the output commutation capacitor step-down of ac/dc converting unit to battery charge.At first, when the first power switch pipe Q1 is set to conducting state, the input power supply of alternating current input power supplying device forms the loop by commutation capacitor, the first boost inductance L1, the first power switch pipe Q1, shown in solid arrow line among Fig. 2, this moment the first boost inductance L1 storage power.Then, power switch pipe Q1 is set to cut-off state, the first boost inductance L1 forms the loop by dc bus diode D1, dc-link capacitance C1 and commutation capacitor, shown in the empty arrow line among Fig. 2, this moment, commutation capacitor C4 and the first boost inductance L1 released energy, C1 charges to dc-link capacitance, thereby realizes the conversion of AC/DC and DC/DC.
Under line model, it also will carry out the conversion of DC/AC, the circuit operation of DC/AC as shown in Figure 3 and Figure 4, the circuit operation figure of the DC/AC of the multistage according to the preferred embodiment of the present invention Boost cascade of Fig. 3 and Fig. 4 boosting power device under line model.According to preferred embodiment, in positive half period, keep the power switch pipe Q5 conducting in the full bridge inverter and power switch pipe Q4 ends, when power switch pipe Q2 conducting, dc-link capacitance C1, power switch pipe Q2, the first inversion inductance L 2, inversion capacitor C 3, the second inversion inductance L 3, power switch pipe Q5 forms the loop, shown in the solid arrow line among Fig. 3, this moment, dc-link capacitance C1 released energy, the first and second inversion inductance storage power, and when power switch pipe Q2 ends, the first inversion inductance L 2, inversion capacitor C 3, the second inversion inductance L 3, the body diode of power switch pipe Q5 and power switch pipe Q3 forms the loop, shown in the empty arrow line among Fig. 3, this moment, the first and second inversion inductance released energy, and positive half cycle waveform is exported in inversion.And in the negative half-cycle of output, keep the power switch pipe Q4 conducting in the full bridge inverter and Q5 ends, when power switch pipe Q3 conducting, dc-link capacitance C1, power switch pipe Q3, the first inversion inductance L 2, inversion capacitor C 3, the second inversion inductance L 3, power switch pipe Q4 form the loop, shown in the solid arrow line among Fig. 4, this moment, dc-link capacitance C1 released energy inversion inductance storage power.And when power switch pipe Q3 ends, the body diode of the first inversion inductance L 2, inversion capacitor C 3, the second inversion inductance L 3, power switch pipe Q4 and power switch pipe Q2 forms the loop, shown in the empty arrow line among Fig. 4, inversion this moment inductance releases energy, inversion output negative half period waveform.What note is to work as control mode not simultaneously, and the conducting situation of circuit is also different, Q2 and Q3 conducting simultaneously simultaneously, Q4 and Q5 conducting simultaneously.
Except last, under line model, the charging boosting unit can be worked equally, and mainly be the charge function of finishing battery this moment.As shown in Figure 5, under line model, the charging boosting unit of multistage Boost cascade boosting power device can be connected the two ends of dc-link capacitance C1, also can be connected the output of ac/dc converting unit, both two ends of commutation capacitor C4, described connection is switched by the switch element such as battery relay (being BAT Relay).Both differences are that when battery charge, the former energy is provided by dc-link capacitance C1, and the direct current of the latter after by rectification provides, and this paper is that example describes with the former.When the switch element such as battery relay is connected to dc-link capacitance C1 by the 3rd boost inductance L5, this moment, the 3rd power switch pipe Q7 ended, system is by controlling the second power switch pipe Q6 conducting and ending to finish charging to battery, circuit operation is: when the second power switch pipe Q6 conducting, boost capacitor C2, the second power switch pipe Q6, the second boost inductance L4 and battery form the loop, shown in the left side solid arrow line loop of Fig. 5, this moment, boost capacitor C2 provided energy, the second boost inductance L4 storage power is battery charge simultaneously.Yet the energy of boost capacitor C2 can provide by switch element and the 3rd boost inductance L5 cause dc-link capacitance C1, shown in the right side side circuit of Fig. 5.When the second power switch pipe Q6 ended, the body diode of the second boost inductance L4, power switch pipe Q7 and battery formed the loop, and shown in the empty arrow line of Fig. 5, the second boost inductance L4 releases energy and is battery charge.
Two, battery mode (BAT Mode)
In addition, when civil power breaks down (for example civil power power down), supply unit will lose and exchange input.In order to keep the output of power supply, need enter the battery mode of being powered by battery this moment.Simultaneously, the present invention is directed to battery series connection number after a little while, the single-stage booster circuit is difficult to satisfy the problem of boosting and requiring, and has proposed a kind of multistage Boost cascade booster circuit topology, thereby finished the smooth conversion of cell voltage to DC bus-bar voltage, kept the lasting output of power supply.
Therefore, according to preferred implementation of the present invention, when municipal power failure can't provide the interchange input, multistage Boost cascade boosting power device need use inner battery that energy temporarily is provided, and described power conversion is exported for exchanging.This moment, system's control was connected to the end of the first boost inductance L1 such as the switch element of battery relay (BAT Relay).Provide the execution mode that adopts the two-stage boosting mode below, but the those skilled in the art should understand, the present invention is not limited to the two-stage structure of boosting, and the progression that boosts can be changed according to the actual requirements.
Under battery mode, battery need pass through the two-stage booster circuit, the circuit operation that the first order is boosted as shown in Figure 6, Fig. 6 is the circuit operation figure that the first order of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under battery mode boosted.This moment the second boost inductance L4, the 3rd power switch pipe Q7, the body diode of boost capacitor C2 and the second power switch pipe Q6 is formed first order Boost circuit, battery (BAT) is as the input of circuit, be boost capacitor C2 charging, circuit operation is: when the 3rd power switch pipe Q7 conducting, the second boost inductance L4, the 3rd power switch pipe Q7 and battery form the loop, shown in the empty arrow of Fig. 6, battery releases energy, the second boost inductance L4 energy storage; When the 3rd power switch pipe Q7 ends, the body diode of battery, the second boost inductance L4, power switch pipe Q6 and boost capacitor C2 form the loop, shown in the solid arrow of Fig. 6, battery and the second boost inductance L4 release energy together, boost capacitor C2 carries out energy storage, boosts thereby finish the first order.
After finishing the first order and boosting, system will further finish the second level boosts, and the circuit operation that boosts in the second level as shown in Figure 7.Fig. 7 is the circuit operation figure that boosts in the second level of multistage according to the preferred embodiment of the present invention Boost cascade boosting power device under battery mode.The first boost inductance L1, the first power switch pipe Q1, dc bus diode D1 and dc-link capacitance C1 form second level Boost circuit at this moment, circuit operation and first order boost action are as follows: when the first power switch pipe Q1 conducting, the first boost inductance L1, the first power switch pipe Q1 and boost capacitor C2 form the loop, shown in the solid arrow of Fig. 7, boost capacitor C2 releases energy, the first boost inductance L1 energy storage; When the first power switch pipe Q1 ended, boost capacitor C2, the first boost inductance L1, dc bus diode D1 and dc-link capacitance C1 formed the loop.Boost capacitor C2 and the first boost inductance L1 release energy shown in the empty arrow of Fig. 7, and dc-link capacitance C1 carries out energy storage, boost thereby finish the second level, and then finish battery to the power conversion of dc-link capacitance C1.
In addition, also will finish the conversion of DC/AC under battery mode, the conversion of the DC/AC of its operation principle during with line model is identical, as shown in Figure 3 and Figure 4, specifically please refer to the description of DC/AC conversion in the line model.
Known to last, under battery mode, the multiplexing charging circuit of first order booster circuit, DC/DC conversion unit B under the complete multiplexing line model of second level booster circuit, therefore the circuit topological structure by preferred implementation of the present invention, not only can save extra charger, improve the efficient of power supply simultaneously, also dwindle the volume and the cost of having saved supply unit of supply unit.
Three, bypass mode (BYP Mode)
Except line model and battery mode, bypass mode also is pattern commonly used, and the circuit operation of multistage Boost cascade boosting power device under bypass mode of the preferred embodiment for the present invention as shown in Figure 8.When need directly be powered by civil power or AC/DC, DC/DC and DC/AC in certain unit etc. when going wrong, can be directly connected to alternating current input power supplying the output that power supply is kept in output this moment.When being in ray mode or battery mode, the bypass relay is connected with the two ends of inversion capacitor C 3, and when being in bypass mode, the two ends of bypass relay and inversion capacitor C 3 disconnect, directly insert the two ends of rectification input circuit, concrete action diagram as shown in Figure 8, the bypass relay directly inserts the output electromagnetic interface filter with alternating current input power supplying, respectively with the L line of out-put supply and N line with exchange the L line of importing and be connected with the N line.
As above by having described the present invention in detail with reference to a small amount of embodiment.Yet those skilled in the art is well-known, limit as subsidiary Patent right requirement, the present invention except above disclosed, other embodiment falls within the scope of the invention equally.
Normally, all terms of Shi Yonging are all explained in the common implication of technical field according to them in the claims, unless defined clearly in addition therein.All references " one/described/these [device, assembly etc.] " all be interpreted as at least one example in described device, the assembly etc. openly, unless clearly state in addition.The step of any method disclosed herein all need not be with the operation of disclosed order accurately, unless clearly state.
Claims (11)
1. the control method of a multistage Boost cascade boosting power device, described supply unit comprises: the ac/dc converting unit, input connects alternating current input power supplying, and AC power is converted to DC power supply; The DC/DC conversion unit, its input connects the output of described ac/dc converting unit, converts direct-current input power supplying to specific DC power supply; The AC/DC converting unit, its input connects the output of described DC/DC conversion unit, converts DC power supply to required interchange out-put supply; Dc-link capacitance is connected between described DC/DC conversion unit and the AC/DC converting unit, is used for storing the direct current energy that the DC/DC conversion unit is exported; The charging boosting unit is connected to described supply unit by switch element, is used for boosting to battery charge and to the electric energy that battery provides, and it is characterized in that described method comprises:
In the time of in being in ray mode, the control switch element boosting unit that will charge is connected the two ends of dc-link capacitance via the 3rd boost inductance, the energy that utilizes dc-link capacitance by the charging boosting unit to battery charge; Perhaps be connected to the output of ac/dc converting unit, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge, and
In the time of in being in battery mode, the control switch element boosting unit that will charge is connected the input of DC/DC conversion unit, and the energy that battery is provided carries out multistage boosting, thereby provides energy for dc-link capacitance.
2. method according to claim 1, it is characterized in that, in the time of in being in ray mode, the energy that utilizes dc-link capacitance comprises battery charge by the charging boosting unit: the charging boosting unit is operated in the step-down mode of operation, after the direct current energy step-down that is stored by dc-link capacitance to battery charge; In the time of perhaps in being in ray mode, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge, comprise: the charging boosting unit be operated in the step-down mode of operation, by after the output commutation capacitor step-down of ac/dc converting unit to battery charge.
3. method according to claim 1, it is characterized in that, in the time of in being in battery mode, the energy that battery is provided carries out multistage boosting and comprises: by the charging boosting unit energy that battery provides is boosted for the first time, carry out secondary booster by the DC/DC conversion unit then.
4. method according to claim 3 is characterized in that, the energy that the charging boosting unit provides battery boosts for the first time and comprises: battery offers second boost inductance with energy, and then battery and second boost inductance provide energy for boost capacitor together.
5. method according to claim 3, it is characterized in that, carrying out secondary booster by the DC/DC conversion unit comprises: boost capacitor provides energy by switch element for first boost inductance, and boost capacitor and first boost inductance provide energy for dc-link capacitance together then.
6. multistage Boost cascade boosting power device, described supply unit comprises:
The ac/dc converting unit, input connects alternating current input power supplying, and AC power is converted to DC power supply;
The DC/DC conversion unit, its input connects the output of described ac/dc converting unit, converts direct-current input power supplying to specific DC power supply;
The AC/DC converting unit, its input connects the output of described DC/DC conversion unit, converts DC power supply to required interchange out-put supply;
Dc-link capacitance is connected between described DC/DC conversion unit and the AC/DC converting unit, is used for storing the direct current energy that the DC/DC conversion unit is exported; And
The charging boosting unit is connected to described supply unit by switch element, is used for boosting to battery charge and to the electric energy that battery provides;
Wherein, in the time of in being in ray mode, the supply unit control switch element boosting unit that will charge is connected the two ends of dc-link capacitance via the 3rd boost inductance, the energy that utilizes dc-link capacitance by the charging boosting unit to battery charge; Perhaps be connected to the output of ac/dc converting unit, utilize the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge, and,
In the time of in being in battery mode, the supply unit control switch element boosting unit that will charge is connected the input of DC/DC conversion unit, and the energy that battery is provided carries out multistage boosting, thereby provides energy for dc-link capacitance.
7. supply unit according to claim 6, it is characterized in that, in the time of in being in ray mode, supply unit uses the energy of dc-link capacitance by the charging boosting unit battery charge to be comprised: the charging boosting unit is operated in the step-down mode of operation, after the direct current energy step-down that is stored by dc-link capacitance to battery charge; Perhaps when in being in ray mode, supply unit utilizes the output energy of ac/dc converting unit to pass through the charging boosting unit to battery charge, comprise: the charging boosting unit be operated in the step-down mode of operation, by after the output commutation capacitor step-down of ac/dc converting unit to battery charge.
8. supply unit according to claim 6, it is characterized in that, in the time of in being in battery mode, the energy that supply unit provides battery carries out multistage boosting and comprises: by the charging boosting unit energy that battery provides is boosted for the first time, carry out secondary booster by the DC/DC conversion unit then.
9. supply unit according to claim 8, it is characterized in that, the energy that the charging boosting unit provides battery boosts for the first time and comprises: battery offers second boost inductance with energy, and then battery and second boost inductance provide energy for boost capacitor together.
10. supply unit according to claim 8, it is characterized in that, carrying out secondary booster by the DC/DC conversion unit comprises: boost capacitor provides energy by switch element for first boost inductance, and boost capacitor and first boost inductance provide energy for dc-link capacitance together then.
11. supply unit according to claim 6, it is characterized in that, the charging boosting unit comprises: the power switch pipe, the 3rd that switch element, boost capacitor, second have a body diode has power switch pipe, second boost inductance and the battery of body diode, and concrete annexation is
The control switch element boosting unit that will charge is connected on the two ends of dc-link capacitance, switch element is connected to an end of dc-link capacitance via the 3rd boost inductance, switch element connects an end of boost capacitor and connects the collector electrode of second power switch pipe, the other end of boost capacitor connects the other end of dc-link capacitance, the emitter of the 3rd power switch pipe, the emitter of battery cathode and first power switch pipe, the emitter of second power switch pipe connects an end of second boost inductance and the collector electrode of the 3rd power switch pipe, and the other end of second boost inductance connects anode; Perhaps
The control switch element boosting unit that will charge is connected on the input of DC/DC conversion unit, switch element is connected to the collector electrode of first power switch pipe and the anode of dc bus diode via first boost inductance, the negative electrode of dc bus diode is connected to an end of dc-link capacitance, switch element connects an end of boost capacitor, the other end of boost capacitor connects the other end of dc-link capacitance, the emitter of the 3rd power switch pipe, the emitter of battery cathode and first power switch pipe, switch element connects the collector electrode of second power switch pipe, the emitter of second power switch pipe connects an end of second boost inductance and the collector electrode of the 3rd power switch pipe, and the other end of second boost inductance connects anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078400.5A CN103326589B (en) | 2012-03-22 | Multistage boost-type cascade step-up supply unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078400.5A CN103326589B (en) | 2012-03-22 | Multistage boost-type cascade step-up supply unit and control method thereof |
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| CN103326589A true CN103326589A (en) | 2013-09-25 |
| CN103326589B CN103326589B (en) | 2016-11-30 |
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