CN111342672A - Charging device for preventing reverse filling through phase shift control of hybrid switch and control method thereof - Google Patents
Charging device for preventing reverse filling through phase shift control of hybrid switch and control method thereof Download PDFInfo
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- 230000010363 phase shift Effects 0.000 title claims abstract description 45
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- 230000033228 biological regulation Effects 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
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- 238000011217 control strategy Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
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- 230000008646 thermal stress Effects 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging device for preventing reverse filling by phase shift control of a hybrid switch, which comprises: the first direct current module and the second direct current module; a mixing switch is connected between the positive end of the second direct current module and the negative end of the first direct current module, and the positive end of the first direct current module and the negative end of the second direct current module are used as output ends; a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shifting control reverse-filling prevention charging output circuit is integrally formed. The invention improves the efficiency of the charging device, reduces the volume and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a charging device for preventing reverse filling under the phase-shift control of a hybrid switch and a control method thereof.
Background
Along with the development and popularization of electric equipment, the demand on charging equipment is increased, the charging voltage ranges of different types of electric equipment are inconsistent, in order to solve the problem, charging pile equipment with a wide voltage output range is used in the industry, for example, the output regulation range is 200 VDC-750 VDC, the output is 330 VDC-750 VDC/20KW, an auxiliary winding is additionally arranged on a secondary side of a transformer in a DC/AC inverter circuit in an improved mode, and whether the secondary winding is switched on or not is controlled through a switch according to the requirement of the secondary side for outputting high and low voltages. The transformer of the technology needs to be added with an auxiliary winding, the efficiency is reduced, the cost is increased, the auxiliary winding is only useful when being connected in series to a secondary side, and the auxiliary winding is not used when not being connected in series. The auxiliary winding leads to the fact that the winding space needs to be enlarged in the design and selection of the magnetic piece, and the size of the magnetic piece is relatively larger; and two direct current modules are connected in series and in parallel to be mutually switched to realize wide-range voltage regulation at secondary side output, so that a proper anti-reverse-filling function is lacked, an anti-reverse-filling diode needs to be added at an output part for realizing the anti-reverse-filling function, and in addition, the on-state loss is large or the dynamic response speed is low, and the potential reliability hazard and the cost are high.
Therefore, how to provide a high-efficiency charging scheme with wide-range output voltage and reverse-flow prevention is a technical problem to be solved in the field.
Disclosure of Invention
The invention provides a charging device for preventing reverse filling by phase shift control of a hybrid switch and a control method thereof, which are used for solving the technical problems of potential reliability hazard and higher cost of charging equipment with a wide voltage output range in the prior art.
The invention provides a charging device for preventing reverse filling by phase shift control of a hybrid switch, which comprises: the direct current module, the diode, the power switch tube and the relay; wherein the content of the first and second substances,
the direct current module comprises: the first direct current module and the second direct current module; a hybrid switch is connected between the positive end of the second direct current module and the negative end of the first direct current module, and the positive end of the first direct current module and the negative end of the second direct current module are used as output ends; the hybrid switch is formed by connecting the power switch tube and a relay in parallel;
the diode, comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shift control reverse-filling prevention charging output circuit is integrally formed.
Further, the power switch tube is a metal oxide semiconductor field effect transistor MOSFET, a drain/D electrode of the metal oxide semiconductor field effect transistor MOSFET is connected to the positive electrode terminal of the second direct current module, and a source/S electrode of the metal oxide semiconductor field effect transistor MOSFET is connected to the anode of the third diode.
Further, the power switch tube is an insulated gate bipolar transistor IGBT, a collector/C electrode of the insulated gate bipolar transistor IGBT is connected to the positive electrode terminal of the second dc module, and an emitter/E electrode of the insulated gate bipolar transistor IGBT is connected to the anode of the third diode.
Further, wherein, this charging device still includes: a hybrid switch drive signal; the low potential of a driving signal of the insulated gate bipolar transistor IGBT is connected with an emitter/E electrode of the insulated gate bipolar transistor IGBT, and the high potential end of a grid/G electrode driving signal of the insulated gate bipolar transistor IGBT is connected; one end of a control wire packet of the relay is connected with a control ground potential, and the other end of the control wire packet of the relay is connected with a driving signal of a relay wire packet.
Further, the first dc module and the second dc module are high-frequency star-type inverter-rectified dc modules, and include: the primary side input circuit is connected with the secondary side output circuit through a transformer;
the primary side input circuit comprises more than or equal to two parallel LLC resonance input circuits, and the LLC resonance input circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonance input circuit of the high-frequency star connection, the terminating ends of primary windings of the transformers are connected to form a star connection point;
the secondary side output circuit comprises two or more parallel LLC resonant output circuits, and the LLC resonant output circuit comprises: the secondary output circuit of transformer, the secondary output circuit of transformer includes: the transformer comprises a secondary side of the transformer and a power full-wave rectification output end, wherein the secondary side of the transformer is connected in parallel and then connected to the power full-wave rectification output end.
Further, wherein, in the primary side input circuit, one of the two resonant switches is grounded.
Further, in the LLC resonant output circuit, reverse-filling prevention direct-current module diodes are respectively disposed on two sides of a secondary side of the transformer.
Further, in the LLC resonant output circuit, an electrolytic capacitor is provided at a front end of the power full-wave rectification output terminal.
On the other hand, the invention also provides a control method of the charging device for preventing reverse filling by phase shift control of the hybrid switch, which comprises the following steps:
connecting a hybrid switch between the positive end of the second direct current module and the negative end of the first direct current module, wherein the hybrid switch is formed by connecting the power switch tube and the relay in parallel; the positive end of the first direct current module and the negative end of the second direct current module are used as output ends, and a charging output circuit controlled by the hybrid switch phase shift is integrally formed;
connecting a diode to the hybrid switch phase shift controlled charge output circuit, the diode comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shift control reverse-filling prevention charging output circuit is integrally formed;
controlling the conduction time of the power switch tube to be ahead of the preset lead time for closing the relay contact, ensuring the zero voltage closing of the relay, and switching the first direct current module and the second direct current module from a parallel mode to a series mode;
and controlling the turn-off time of the power switch tube to lag behind the turn-off preset lag time of the relay contact, ensuring the zero voltage turn-off of the relay, and switching the first direct current module and the second direct current module from a series mode to a parallel mode.
Further wherein the lead time is 0.2 μ S; the lag time is 25 mS.
Compared with the prior art, the hybrid switch phase-shift control reverse filling prevention charging device and the control method thereof do not need to increase the auxiliary winding of the secondary side of the transformer, can fully increase the effective wire diameter of the secondary side winding, reduce the loss and have higher efficiency; the power tube and the relay are adopted for phase shift control, when the relay is switched on and off at zero voltage, the charging pile module works in a stable state when the two output modules are connected in series, the relay contact works in a suction conduction state, and the on-state loss of the relay is relatively small compared with the on-state loss of a high-voltage switch tube such as a high-voltage MOSFET or a high-voltage IGBT, so that the efficiency of the charging device is improved.
An auxiliary winding on the secondary side of the transformer is not needed, a smaller magnetic core can be selected when the same secondary side line diameter or output power condition is selected, the required space is smaller, and the size is reduced; the power tube and the relay are adopted for phase shift control, and the size of the radiator is smaller than that of the radiator which is used for realizing the same loss and heat dissipation by adopting a plurality of power tubes in parallel connection; by adopting the hybrid switch formed by connecting the switch tube and the relay in parallel and adopting the phase-shifting control strategy for the switch tube and the relay, the main contact of the relay can be ensured to be closed and disconnected in a zero-pressure state, the problems of easy arc discharge and easy ignition when only the relay is disconnected are thoroughly avoided, the problem of reliability of adhesion can also be avoided, and the reliability is remarkably improved. When the two output modules are connected in series or in parallel, the anti-reverse-irrigation device has a perfect anti-reverse-irrigation function.
The hybrid switch formed by connecting the power tube and the relay in parallel and the phase-shifting control strategy adopted for switching on and off the power tube and the relay are much lower in cost than the cost of the hybrid switch formed by connecting more power MOSFETs in parallel or adopting a single MOSFET with larger power tube and equivalent on-resistance to realize the same on-state loss, for example, the contact resistance of a typical high-current 50A relay is about 1m omega-2 m omega, and the on-state resistance of a high-voltage MOSFET with the high current of 85A @25 ℃ is about 30m omega @25 ℃; for example, the saturation voltage drop of the high-current 150A high-voltage IGBT is about 1.8V @25 ℃, the parallel connection of the IGBTs is mainly beneficial to the uniform distribution of loss, the reduction of the total loss is basically not obvious, and the thermal stress of a single IGBT can be reduced. And an additional anti-reverse-filling diode is not required to be added, so that the cost for realizing the anti-reverse-filling function is relatively low, and the total cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a charging pile module circuit with an auxiliary winding added on a secondary side in the prior art;
fig. 2 is a schematic structural diagram of a charging pile module circuit with two direct current modules on a secondary side switched in series-parallel connection;
fig. 3 is a schematic circuit structure diagram of an efficient charging pile device with wide-range output voltage and reverse-charging prevention controlled by a hybrid switch phase shift according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the anti-reverse-filling function of the charging device with the hybrid switch phase-shift controlled for anti-reverse-filling in the embodiment of the present invention, in which the first DC module and the second DC module are connected in parallel;
FIG. 5 is a schematic diagram illustrating a reverse-filling prevention function of a charging device with a hybrid switch phase-shift controlled reverse-filling prevention function, in which a first DC module and a second DC module are connected in series;
FIG. 6 is a schematic diagram of a control timing diagram of a phase-shifting hybrid switch in the charging device for phase-shifting control and reverse filling prevention of the hybrid switch according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a specific application of the hybrid switch phase shift control reverse-filling prevention charging device in the embodiment of the present invention;
fig. 8 is a flowchart illustrating a control method of a charging device for preventing reverse filling through hybrid switch phase shift control according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in a charging pile module circuit with an auxiliary winding added on the secondary side in the prior art, a wide-range voltage output is realized by switching an auxiliary winding N1, when the output voltage is in a lower range, S3 turns on a point B, the auxiliary winding N1 on the secondary side is not connected to the auxiliary winding, when the output voltage is in a lower range, S3 turns on a point a, the auxiliary winding N1 is connected to the auxiliary winding, and the equivalent winding on the secondary side is that a winding N1 is connected in series with a winding N2; according to the technical scheme, an auxiliary winding N1 needs to be additionally arranged, and a winding N1 needs to meet the requirements of outputting the maximum current and the maximum voltage in a series mode, so that the winding needs to occupy a larger transformer space, the size of the transformer needs to be increased, the efficiency of the transformer is reduced, and the cost is increased.
As shown in fig. 2, a schematic structural diagram of a charging pile module circuit with two dc modules on a secondary side switched in series-parallel connection is shown, a series-parallel switching mode is adopted, the series-parallel connection of the two modules is realized by controlling a switch of K1, when K1 is turned on, the two modules are connected in series, which is beneficial to realizing the output of higher voltage, and when K1 is turned off, the two modules are connected in parallel, which is beneficial to realizing the output of lower voltage, in a series working mode of the circuit, a reverse-filling prevention diode needs to be added at an output end, and when the circuit works in parallel, the diode also flows through output large current, so that the loss is increased, and a large radiator is; in addition, if the K1 adopts a single switch and a semiconductor switch, the dynamic switching speed is high, but the loss is large when the large current passes through, the efficiency is low, or the loss is reduced and the heat dissipation is shared by increasing the large cost, selecting the power with extremely low on-resistance or voltage, or adopting a plurality of parallel connection modes, the technical cost is high, or the occupied space is large, and the size of the radiator is large; if a single relay switch is adopted, the dynamic corresponding speed is slow, the hidden danger of arc discharge exists when high-voltage large current is disconnected, the hidden danger of contact adhesion is easily caused by contact ignition of relay contacts when the relay switch is closed under certain pressure difference and large current, and the reliability is low.
As shown in fig. 3 to 7, fig. 3 is a schematic circuit structure diagram of a wide-range output voltage and reverse-charging prevention efficient charging pile device controlled by phase shift of a hybrid switch in the embodiment; fig. 4 is a schematic diagram illustrating the anti-reverse-filling function of the charging device with the hybrid switch phase-shift controlled for anti-reverse-filling in the embodiment, in which the first dc module and the second dc module are connected in parallel; fig. 5 is a schematic diagram illustrating a reverse-filling prevention function of the hybrid switch in series connection between the first dc module and the second dc module of the charging device for phase shift control of the reverse-filling prevention in this embodiment; FIG. 6 is a schematic diagram illustrating a timing diagram of controlling the phase-shifting hybrid switch in the charging device for preventing reverse filling under phase-shifting control of the hybrid switch in this embodiment; fig. 7 is a schematic diagram of a specific application of the charging device for preventing reverse filling under the phase shift control of the hybrid switch in this embodiment.
The two direct current output modules are used as output, a switch tube and a relay are connected in parallel to form a hybrid switch, a phase shift control mode is adopted for switching on and switching off of the switch tube and the relay to realize small on-state loss and ensure that the main contact of the relay is attracted and separated to work in a zero voltage mode, the switching on and switching off of the hybrid switch formed by the switch tube and the relay are used for controlling the serial connection and the parallel connection of the two modules, a diode is connected in series to the hybrid switch formed by the parallel connection of the switch tube and the relay for preventing the output reverse filling function in the two direct current output serial connection working modes, the problems in the prior art can be effectively solved, and the hybrid switch has the advantages of reverse filling prevention, high efficiency, small radiator, high cost, high reliability and the like.
Specifically, this charging device that hybrid switch phase shift control was prevented flowing backward includes: the direct current module, the diode, the power switch tube and the relay; wherein, direct current module includes: the first direct current module and the second direct current module; a mixing switch is connected between the positive end of the second direct current module and the negative end of the first direct current module, and the positive end of the first direct current module and the negative end of the second direct current module are used as output ends; the hybrid switch is formed by connecting a power switch tube and a relay in parallel.
A diode, comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shifting control reverse-filling prevention charging output circuit is integrally formed.
When the power switch tube is switched on or the relay is switched off, the output of the two direct current modules is in a series mode; when the power switch tube is disconnected and the relay is disconnected, the outputs of the two direct current modules are in a parallel mode. And the output of the two direct current modules is in a series mode, and a third diode which is connected with a hybrid switch formed by connecting the power switch tube and the relay in parallel is connected in series to realize the function of preventing reverse irrigation in the series mode. Under the parallel mode of the output of the two direct current modules, a first diode connected between the positive ends of the two modules and a second diode connected between the negative ends of the two modules and the negative end realize the reverse-filling prevention function of the two modules.
In some optional embodiments, the power switch tube is a MOSFET, a drain/D of the MOSFET is connected to the positive terminal of the second dc module, and a source/G of the MOSFET is connected to the anode of the third diode.
In some optional embodiments, the power switch tube may be an insulated gate bipolar transistor IGBT, a collector/C electrode of the insulated gate bipolar transistor IGBT is connected to the positive electrode terminal of the second dc module, and an emitter/E electrode of the insulated gate bipolar transistor IGBT is connected to the anode of the third diode.
In some optional embodiments, further comprising: a hybrid switch drive signal; the emitter/E electrode of the insulated gate bipolar transistor IGBT is connected with one end of the resistor, the output end of the relay and the anode of the third diode, and is simultaneously connected with the low-potential end of a gate driving signal of the insulated gate bipolar transistor IGBT; the other end of the resistor is connected with a grid/G electrode of the insulated gate bipolar transistor IGBT and is simultaneously connected with a high potential end of a driving signal of the insulated gate bipolar transistor IGBT; one end of the control wire package of the relay is connected with the control ground potential, and the other end of the control wire package of the relay is connected with the driving signal of the control wire package of the relay.
In some optional embodiments, the first dc module and the second dc module are high-frequency star-type inverter rectified dc modules, and include: the primary side input circuit is connected with the secondary side output circuit through a transformer.
Primary side input circuit, including being greater than or equal to two way LLC resonance input circuit that connect in parallel, LLC resonance input circuit includes: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonance input circuit of the high-frequency star connection, the terminating ends of primary windings of a transformer are connected to form a star connection point. In the primary input circuit, one of the two resonant switches is grounded.
Vice limit output circuit, including being greater than or equal to two parallelly connected LLC resonance output circuit of way, LLC resonance output circuit includes: the secondary limit output circuit of transformer, the secondary limit output circuit of transformer includes: the secondary side of the transformer is connected in parallel and then connected to the output end of the power full-wave rectification. In the LLC resonant output circuit, reverse-filling prevention direct current module diodes are respectively arranged on two sides of one secondary side of a transformer, and an electrolytic capacitor is arranged at the front end of a full-wave rectification output end of a power supply.
Referring to fig. 7, the charging pile module circuit is suitable for controlling the output of two high-frequency star-shaped inversion-rectification direct current modules and preventing reverse charging by a phase-shifting hybrid switch, the charging pile module circuit inputs two paths of Vi/400VDC connected in series and has a rated output of 400VDC/50A, and the voltage regulation of the total output Vo from 200VDC to 1000VDC in a wide range can be realized by the serial or parallel connection mode of the output VoA of the hybrid switch control module A and the output VoB of the module B and the regulation of the output voltage VoA of the module A and the output voltage VoB of the module B by digital control.
The charging pile module circuit integrally comprises a module A and a module B which have the same circuit, three diodes for preventing reverse filling, a hybrid switch IGBT tube and a relay controlled by phase shift, and a load; specifically, the module a circuit is configured as follows:
the first primary side input circuit comprises a first switch S2 and a second switch S3, wherein the third switch S3 is grounded, the second switch S2 and the third switch S3 are connected to one end of a first resonant inductor L1, the other end of the first resonant inductor L1 is connected to one end of a first resonant capacitor C1, and the other end of the first resonant capacitor C1 is connected to one end of a primary winding of a first transformer T1.
The second primary side input circuit comprises a fourth switch S4 and a fifth switch S5, wherein the fifth switch S5 is grounded, the fourth switch S4 and the fifth switch S5 are connected to one end of a second resonant inductor L2, the other end of the second resonant inductor L2 is connected to one end of a second resonant capacitor C2, and the other end of the second resonant capacitor C2 is connected to one end of a primary side winding of a second transformer T2.
The third primary input circuit comprises a sixth switch S6 and a seventh switch S7, wherein the seventh switch S7 is grounded, the sixth switch S6 and the seventh switch S7 are connected to one end of a third resonant inductor L3, the other end of the third resonant inductor L3 is connected to one end of a third resonant capacitor C3, and the other end of the third resonant capacitor C3 is connected to one end of a primary winding of a third transformer T3.
The other end of the primary winding of the first transformer T1 is connected to the other end of the primary winding of the second transformer T2 and the other end of the primary winding of the third transformer T3 to form a first star connection point.
The first transformer secondary side, the second transformer secondary side, the third transformer secondary side, the fourth diode VD4, the fifth diode VD5, the sixth diode VD6, the seventh diode VD7, the eighth diode VD8, the ninth diode VD9 and the seventh electrolytic capacitor C7 form a secondary side high-frequency star-shaped full-wave rectifying circuit, and the module A outputs voltage VoA.
The principle and elements of the circuit of the module B are the same as those of the circuit of the module a, and only the element bit numbers are different, and the module B outputs the voltage VoB, which is shown in fig. 7.
The negative end of the output VoB of the module B is connected with the anode of a diode VD2, and the cathode of a diode VD2 is connected with the negative end of the output VoA of the module A; the positive end of the output VoB of the module B is connected with the anode of a first diode VD1, the collector/C electrode of a first switching tube S1/IGBT and one end of a relay K1; the cathode of the first diode VD1 is connected with the positive terminal of the module A output VoA; the emitter/E electrode of the first switch tube S1/IGBT is connected with one end of a first resistor R1, the other end of a relay K1 and the anode of a third diode VD3, and is simultaneously connected with the low-potential end S1_ DRV _ GND of the gate driving signal of the first switch tube S1/IGBT; the cathode of the third diode VD3 is connected to the negative terminal of the module a output VoA; the other end of the first resistor R1 is connected with the grid/G pole of the first switch tube S1/IGBT, and is also connected with the high potential end S1_ DRV of the driving signal of the first switch tube S1/IGBT; one end of a control wire packet of the relay K1 is connected with a control ground potential K1_ DRV _ GND, and the other end of a control wire packet of the relay K1 is connected with a driving signal K1_ DRV.
The positive end of the output VoA of the module A is the positive end of the total output voltage Vo and is connected with the positive end of the load; the negative terminal of the output VoB of the module B is the negative terminal of the total output voltage Vo, and is connected with the negative terminal of the load.
Next, a primary side driving timing sequence of the embodiment is explained, wherein a first primary side input circuit, a second primary side input circuit and a third primary side input circuit form a first high-frequency star LLC resonant conversion connection, a fourth primary side input circuit, a fifth primary side input circuit and a sixth primary side input circuit form a second high-frequency star LLC resonant conversion connection, and the phase difference of driving signals of three bridge arms of each star connection is 120 degrees, and the phase difference of upper and lower tubes of the same bridge arm is 180 degrees; in the specific embodiment, the driving signals of the upper and lower tubes of the first bridge arm and the fourth bridge arm are the same, or the phases of the bridge arms are the same, the phases of the second bridge arm and the fifth bridge arm are the same, and the phases of the third bridge arm and the sixth bridge arm are the same. In the implementation, the primary side input of the module A and the module B is 400VDC, the input of the first bridge arm, the input of the second bridge arm and the input of the third bridge arm of the primary side are all connected between 400VDC and ground potential, and the input of the fourth bridge arm, the input of the fifth bridge arm and the input of the sixth bridge arm of the primary side are all connected between the ground potential and-400 VDC.
Meanwhile, the phase shift control time sequence of the secondary side hybrid switch needs to meet the following requirements: when the module A output and the module B output are switched from the parallel mode to the series mode, the control timing sequence of the hybrid switch formed by the switch tube S1/IGBT and the relay K1 ensures that the conduction lead time delta t1 of the switch tube S1/IGBT is closed at the contact of the relay K1 to ensure the zero-voltage closing of the relay K1, and the control timing sequence is shown in FIG. 6, in this embodiment, the delta t1 can be 0.2 mu S.
When the module a output and the module B output are switched from the series mode to the parallel mode, the control timing of the hybrid switch formed by the switch tube S1/IGBT and the relay K1 should ensure the turn-off delay Δ t2 of the switch S1/IGBT to turn off the contact of the relay K1 to ensure the zero-voltage turn-off of the relay K1, the control timing is as shown in fig. 6, and in this embodiment, Δ t2 may be 25 mS.
Meanwhile, the output voltage of the module A and the output voltage of the module B can be regulated within the range of 200 VDC-560 VDC, the total output voltage of the circuit can be regulated within the wide range of 200 VDC-1000 VDC, and the regulation range of 200 VDC-1000 VDC meets the regulation range requirement of the current charging pile module.
As shown in fig. 8, which is a schematic flow step diagram of a control method of a charging device with hybrid switch phase-shift control for preventing reverse filling in this embodiment, the method can be implemented by the charging device with hybrid switch phase-shift control for preventing reverse filling, and specifically includes the following steps:
Step 802, connecting a diode to a charging output circuit for phase shift control of a hybrid switch, the diode comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shifting control reverse-filling prevention charging output circuit is integrally formed.
And 803, controlling the conduction time of the power switch tube to be ahead of the preset lead time for closing the relay contact, ensuring the zero voltage closing of the relay, and switching the parallel mode of the first direct current module and the second direct current module into the series mode.
And step 804, controlling the turn-off time of the power switch tube to lag the preset turn-off lag time of the relay contact, ensuring the zero voltage turn-off of the relay, and switching the first direct current module and the second direct current module from the series mode to the parallel mode. The lead time may be 0.2 mus; the lag time may be 25 mS.
To sum up, the circuit of this embodiment adopts the direct current module output of two high frequency star type contravariant commutations of a hybrid switch phase shift control and prevents filling the electric pile module circuit of filling backward, can realize wide range output voltage and adjust, reduces the on-state loss, promotes efficiency, reduce cost or volume, reduces thermal stress, also can to a great extent promote the reliability.
The above description is only an exemplary embodiment of the present invention, and the first to sixth primary side input circuits may also be connected in a manner that the primary side inputs of the two star connections are all connected to +400 VDC; or the primary input and inversion and rectification of the modules a and B as described above may also be a half-bridge topology or a full-bridge topology.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a hybrid switch phase shift control prevents charging device who irritates, its characterized in that includes: the direct current module, the diode, the power switch tube and the relay; wherein the content of the first and second substances,
the direct current module comprises: the first direct current module and the second direct current module; a hybrid switch is connected between the positive end of the second direct current module and the negative end of the first direct current module, and the positive end of the first direct current module and the negative end of the second direct current module are used as output ends; the hybrid switch is formed by connecting the power switch tube and a relay in parallel;
the diode, comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shift control reverse-filling prevention charging output circuit is integrally formed.
2. The charging device of claim 1, wherein the power switch is a MOSFET, a drain/D of the MOSFET is connected to the positive terminal of the second dc module, and a source/S of the MOSFET is connected to the anode of the third diode.
3. The hybrid switch phase-shift control anti-reverse-filling charging device according to claim 1, wherein the power switch tube is an Insulated Gate Bipolar Transistor (IGBT), a collector/C electrode of the IGBT is connected with a positive electrode end of the second direct current module, and an emitter/E electrode of the IGBT is connected with an anode of the third diode.
4. The hybrid switch phase-shift control reverse-filling prevention charging device according to claim 3, further comprising: a hybrid switch drive signal; the low potential of a driving signal of the insulated gate bipolar transistor IGBT is connected with an emitter/E electrode of the insulated gate bipolar transistor IGBT, and the high potential end of a grid/G electrode driving signal of the insulated gate bipolar transistor IGBT is connected; one end of a control wire packet of the relay is connected with a control ground potential, and the other end of the control wire packet of the relay is connected with a driving signal of a relay wire packet.
5. The hybrid switch phase shift control reverse-filling prevention charging device according to any one of claims 1 to 4, wherein the first direct current module and the second direct current module are high-frequency star-type inversion rectification direct current modules, and comprise: the primary side input circuit is connected with the secondary side output circuit through a transformer;
the primary side input circuit comprises more than or equal to two parallel LLC resonance input circuits, and the LLC resonance input circuit comprises: the primary side of the transformer comprises two resonance switches, a coupling inductor, a resonance capacitor and a transformer; after the coupling inductor, the resonant capacitor and the initial end of the primary winding of the transformer are connected in series, one end of the coupling inductor is connected in series between the two resonant switches; in the LLC resonance input circuit of the high-frequency star connection, the terminating ends of primary windings of the transformers are connected to form a star connection point;
the secondary side output circuit comprises two or more parallel LLC resonant output circuits, and the LLC resonant output circuit comprises: the secondary output circuit of transformer, the secondary output circuit of transformer includes: the transformer comprises a secondary side of the transformer and a power full-wave rectification output end, wherein the secondary side of the transformer is connected in parallel and then connected to the power full-wave rectification output end.
6. The hybrid switch phase-shift control anti-reverse-filling charging device according to claim 5, wherein one of the two resonant switches is grounded in the primary side input circuit.
7. The hybrid switch phase-shift control anti-reverse-filling charging device according to claim 5, wherein in the LLC resonant output circuit, reverse-filling prevention direct current module diodes are respectively arranged on two sides of a secondary side of the transformer.
8. The charging device for preventing reverse filling in hybrid switch phase shift control according to claim 5, wherein an electrolytic capacitor is arranged at the front end of the output end of the power supply full-wave rectification in the LLC resonant output circuit.
9. A control method of a charging device for preventing reverse filling under phase shift control of a hybrid switch is characterized by comprising the following steps:
connecting a hybrid switch between the positive end of the second direct current module and the negative end of the first direct current module, wherein the hybrid switch is formed by connecting the power switch tube and the relay in parallel; the positive end of the first direct current module and the negative end of the second direct current module are used as output ends, and a charging output circuit controlled by the hybrid switch phase shift is integrally formed;
connecting a diode to the hybrid switch phase shift controlled charge output circuit, the diode comprising: a first diode, a second diode and a third diode; the anode of the first diode is connected to the positive end of the second direct current module, and the cathode of the first diode is connected to the positive end of the first direct current module; the anode of the second diode is connected to the negative end of the second direct current module, and the cathode of the second diode is connected to the negative end of the first direct current module; the cathode of the third diode is connected to the cathode end of the first direct current module, the anode of the third diode is connected to the hybrid switch, the other end of the hybrid switch is connected to the anode end of the second direct current module, and the hybrid switch phase-shift control reverse-filling prevention charging output circuit is integrally formed;
controlling the conduction time of the power switch tube to be ahead of the preset lead time for closing the relay contact, ensuring the zero voltage closing of the relay, and switching the first direct current module and the second direct current module from a parallel mode to a series mode;
and controlling the turn-off time of the power switch tube to lag behind the turn-off preset lag time of the relay contact, ensuring the zero voltage turn-off of the relay, and switching the first direct current module and the second direct current module from a series mode to a parallel mode.
10. The control method of the hybrid switch phase shift control reverse-filling prevention charging device according to claim 9, wherein the lead time is 0.2 μ S; the lag time is 25 mS.
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| CN202010273625.0A CN111342672A (en) | 2020-04-09 | 2020-04-09 | Charging device for preventing reverse filling through phase shift control of hybrid switch and control method thereof |
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| CN202010273625.0A CN111342672A (en) | 2020-04-09 | 2020-04-09 | Charging device for preventing reverse filling through phase shift control of hybrid switch and control method thereof |
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