CN116345721A - Inductively coupled electric energy transmission device - Google Patents
Inductively coupled electric energy transmission device Download PDFInfo
- Publication number
- CN116345721A CN116345721A CN202310402254.5A CN202310402254A CN116345721A CN 116345721 A CN116345721 A CN 116345721A CN 202310402254 A CN202310402254 A CN 202310402254A CN 116345721 A CN116345721 A CN 116345721A
- Authority
- CN
- China
- Prior art keywords
- port
- converter
- power switch
- diode
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 19
- 230000000151 anti-reflux effect Effects 0.000 claims abstract description 18
- 238000011217 control strategy Methods 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims description 21
- 230000004907 flux Effects 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 23
- 230000008859 change Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
- H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
-
- 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
Abstract
The invention relates to a power electronic converter technology, and provides an inductively coupled electric energy transmission device, a bus capacitor, an anti-reflux diode, a primary capacitor, a converter, a primary inductor and a secondary load; according to the embodiment, the converter with the variable switch structure is arranged, so that the frequency tracking process and the energy injection process can be decoupled mutually by the electromagnetic induction energy transfer device, the topological structure of self-adaptive resonance of the system working frequency and power regulation of variable period is achieved, and the problems that in the prior art, the contradiction between system parameter time-varying and resonance frequency constraint exists, the frequency tracking and power control are difficult due to the system parameter time-varying are solved; the topological structure provided by the embodiment has the characteristics that the switch control strategy is simple and convenient, and the switch always works under the soft switch condition.
Description
Technical Field
The invention relates to a power electronic converter technology, in particular to an inductively coupled electric energy transmission device.
Background
Inductively coupled power transfer is a non-contact power transfer method that is widely used in such fields as power conversion, physical isolation, wireless power supply, and induction heating. Inductively coupled power transfer employs inductively coupled power transfer techniques (Inductive Power Transmission, IPT) whose basic principle is to drive a transmit coil (primary inductor) with high frequency power at the primary (primary side) which is transferred to a receive coil (secondary inductor) at the secondary (secondary side) through an electromagnetic flux linkage. The IPT system is in principle a loosely coupled transformer system. Because the inductive coupling energy between the primary and the secondary is very weak in the loose coupling transformer, the system mutual inductance is much smaller than the leakage inductance, and the small mutual inductance leads to high reactive power and extremely low transmission efficiency. In order to solve the problems of bus circulation and low transmission efficiency caused by large reactive power, a resonant network is generally added in a primary loop and a secondary loop to compensate the reactive power, so that the purposes of eliminating circulation and improving transmission efficiency are achieved, and the problem of poor coupling capability is solved. The resonant network added in the loop causes mutual adhesion and strong mutual coupling between the converter and the resonant loop. The strong coupling characteristics result in the converter operating frequency and phase having to be consistent with the resonant network, and the change in system switching state can only be made at the primary current zero-crossing point, otherwise the switching elements in the converter lose soft switching operating conditions, which greatly increases the difficulty of the switching control strategy.
The actual application scene of the IPT system is complex, and the IPT system is a variable parameter system such as load change, coil asymmetry, air gap change and the like. The parameter change can cause frequency drift of the resonant network, so that detuning is caused between the converter and the resonant network, which greatly influences the practical application of the IPT system. Therefore, many scholars and engineers are looking for better control devices and methods for controlling IPT systems.
Disclosure of Invention
The embodiment of the invention provides an inductively coupled electric energy transmission device and a control method thereof, which are used for solving the problem of system detuning and reducing the control difficulty.
The invention provides an inductively coupled electric energy transfer apparatus, comprising:
a bus capacitor; an anti-reflux diode; a primary capacitance; a current transformer; a primary inductance; a secondary load;
the bus capacitor is connected with an external power supply UDC+ port and a UDC-port at two ends respectively;
the converter comprises a port A1, a port A2, a port B1, a port B2, a port B3 and a port B4;
the positive end of the anti-reflux diode is connected with the external power supply UDC+ port, the negative end of the anti-reflux diode is connected with the converter A1 port, and the external power supply UDC-port is connected with the converter A2 port;
one end of the primary capacitor is connected with the port B1 of the current transformer, the other end of the primary capacitor is connected with the port B3 of the current transformer, and one end of the primary inductor is connected with the port B2 of the current transformer, and the other end of the primary inductor is connected with the port B4 of the current transformer;
an electromagnetic induction flux linkage exists between the primary inductor and the secondary load, and energy in the primary inductor is transferred to the secondary load through the electromagnetic induction flux linkage;
if the converter is in the first working state, the port A1 of the converter is connected with the port B2, and the port A2 is connected with the port B4; the external power supply UDC injects current to an A1 port of the converter through the anti-reflux diode, and the current injected into the A1 port flows out through a B2 port and is injected into the primary inductor;
if the converter is in the second working state, the port B1 of the converter is connected with the port B2, the port B3 of the converter is connected with the port B4, the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are connected through the port B1, the port B2, the port B3 and the port B4 of the converter to form a resonant tank to generate resonance;
if the converter is in the third working state, the converter A1 port, the converter A2 port, the converter B1 port, the converter B2 port, the converter B3 port and the converter B4 port are respectively separated and disconnected; the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are mutually isolated to stop resonance; in a specific working occasion, the third working state can be canceled;
during the first and second operating states, the primary inductor transfers energy to the secondary load through the electromagnetic induction flux linkage.
The converter comprises a first power switch, a second power switch, a third power switch, a first diode, a second diode and a third diode.
The secondary load comprises a secondary inductor and/or a secondary capacitor connected in parallel or in series with the secondary inductor, an electromagnetic induction flux linkage exists between the secondary inductor and the primary inductor, and energy in the primary inductor is transferred to the secondary load through the electromagnetic induction flux linkage; the secondary load comprises a metal to be heated.
The primary inductor and the secondary inductor are provided with magnetic cores.
The first diode is a body diode of the first power switch, the second diode is a body diode of the second power switch, and the third diode is a body diode of the third power switch.
When the converter is in the first working state and the third working state, the primary capacitor voltage is clamped at the bus capacitor voltage.
The working state control strategy of the converter is as follows:
when the first power switch, the second power switch and the third power switch are all turned off, the converter is in a third working state; when the first power switch and the second power switch are turned on and the third power switch is turned off, the converter is in a first working state; when the first power switch is turned off, the second power switch is turned on, the third power switch is turned on, or the second power switch and the third power switch are all turned on, the converter is in a second working state.
The working sequence of the converter is controlled as follows: the first working state, the second working state, the third working state and the first working state are circularly reciprocated according to the rule; in a specific case, the working sequence of the converter is as follows: the first working state, the second working state and the first working state are cyclically and reciprocally carried out according to the rule.
The second working state of the converter comprises a first transition state, a resonance state and a second transition state; when the second power switch is conducted and the third diode is conducted, the converter is in the first transition state; when the third power switch is conducted and the second diode is conducted, the converter is in the second transition state; when the second power switch and the third power switch are conducted, the second diode and the third diode are alternately conducted, and the converter is in a resonance state.
The electromagnetic induction energy transfer device provided by the embodiment of the invention can decouple the frequency tracking process and the energy injection process by constructing the converter with a variable switch structure, so that the topological structure of self-adaptive resonance of the system working frequency and power regulation of variable period is achieved, and the problems of frequency tracking and power control difficulty caused by contradiction between system parameter time variation and resonance frequency constraint and system parameter time variation in the prior art are solved; in addition, the topological structure provided by the embodiment of the invention has the characteristics of simple and convenient switch control strategy and always working under the soft switch condition.
Drawings
Fig. 1 is a schematic diagram of an inductively coupled power transfer apparatus according to the present invention.
Fig. 2 is a schematic diagram of an application topology of an inductively coupled power transfer device current transformer in a first operating state according to the present invention.
Fig. 3 is a schematic diagram of an application topology of an inductively coupled power transfer device current transformer in a second operating state according to the present invention.
Fig. 4 is a schematic topology diagram of a first embodiment of a current transformer of an inductively coupled power transfer apparatus in accordance with the present invention.
Fig. 5 is a schematic topology diagram of a first embodiment of a secondary load of an inductively coupled power transfer apparatus in accordance with the present invention.
Fig. 6 is a schematic diagram of a secondary load topology of an inductively coupled power transfer apparatus in accordance with a second embodiment of the invention.
Fig. 7 is a schematic timing waveform diagram of a first embodiment of an inductively coupled power transfer device current transformer according to the present invention.
Fig. 8 is a schematic diagram illustrating a first operating state of a first embodiment of a converter of an inductively coupled power transfer apparatus in accordance with the present invention.
Fig. 9 is a schematic diagram of a first transition state of a second operating state of a first embodiment of an inductively coupled power transfer apparatus converter in accordance with the present invention.
Fig. 10 is a schematic diagram of a resonant state of a first embodiment of an inductively coupled power transfer device converter according to the present invention.
Fig. 11 is a schematic diagram of a second transition state of a first embodiment of a converter of an inductively coupled power transfer device according to the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to at least partially solve the problems in the prior art, for example, how to solve the problems of difficult control of the frequency tracking of the converter and/or the state change of the switching components of the converter of the wireless energy transmission device. An inductively coupled electric energy transmission device and a control method thereof are provided to solve the problem of system detuning and reduce the control difficulty. The embodiment of the invention provides an inductively coupled electric energy transmission device, which comprises:
a bus capacitor; an anti-reflux diode; a primary capacitance; a current transformer; a primary inductance; a secondary load;
the bus capacitor is connected with an external power supply UDC+ port and a UDC-port at two ends respectively;
the converter comprises a port A1, a port A2, a port B1, a port B2, a port B3 and a port B4;
the positive end of the anti-reflux diode is connected with the external power supply UDC+ port, the negative end of the anti-reflux diode is connected with the converter A1 port, and the external power supply UDC-port is connected with the converter A2 port;
one end of the primary capacitor is connected with the port B1 of the current transformer, the other end of the primary capacitor is connected with the port B3 of the current transformer, and one end of the primary inductor is connected with the port B2 of the current transformer, and the other end of the primary inductor is connected with the port B4 of the current transformer;
an electromagnetic induction flux linkage exists between the primary inductor and the secondary load, and energy in the primary inductor is transferred to the secondary load through the electromagnetic induction flux linkage;
if the converter is in the first working state, the port A1 of the converter is connected with the port B2, and the port A2 is connected with the port B4; the external power supply UDC injects current to an A1 port of the converter through the anti-reflux diode, and the current injected into the A1 port flows out through a B2 port and is injected into the primary inductor;
if the converter is in the second working state, the port B1 of the converter is connected with the port B2, the port B3 of the converter is connected with the port B4, the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are connected through the port B1, the port B2, the port B3 and the port B4 of the converter to form a resonant tank to generate resonance;
if the converter is in the third working state, the converter A1 port, the converter A2 port, the converter B1 port, the converter B2 port, the converter B3 port and the converter B4 port are respectively separated and disconnected; the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are mutually isolated to stop resonance; in a specific working occasion, the third working state can be canceled;
during the first and second operating states, the primary inductor transfers energy to the secondary load through the electromagnetic induction flux linkage.
The converter comprises a first power switch, a second power switch, a third power switch, a first diode, a second diode and a third diode.
The secondary load comprises a secondary inductance and/or a secondary capacitance connected in parallel or in series with the secondary inductance, an electromagnetic induction flux linkage being present between the secondary inductance and the primary inductance, through which electromagnetic induction flux linkage the energy in the primary inductance is transferred to the secondary load.
The primary inductor and the secondary inductor are provided with magnetic cores.
The first diode is a body diode of the first power switch, the second diode is a body diode of the second power switch, and the third diode is a body diode of the third power switch.
When the converter is in the first working state and the third working state, the primary capacitor voltage is clamped at the bus capacitor voltage.
The working state control strategy of the converter is as follows:
when the first power switch, the second power switch and the third power switch are all turned off, the converter is in a third working state; when the first power switch and the second power switch are turned on and the third power switch is turned off, the converter is in a first working state; when the first power switch is turned off, the second power switch is turned on, the third power switch is turned on, or the second power switch and the third power switch are all turned on, the converter is in a second working state.
The working sequence of the converter is controlled as follows: the first working state, the second working state, the third working state, the first working state and … … are circularly reciprocated according to the rule; in a specific case, the working sequence of the converter is as follows: first working state-second working state-first working state- … …, and cyclically reciprocating according to the rule.
The second working state of the converter comprises a first transition state, a resonance state and a second transition state; when the second power switch is conducted and the third diode is conducted, the converter is in the first transition state; when the third power switch is conducted and the second diode is conducted, the converter is in the second transition state; when the second power switch and the third power switch are conducted, the second diode and the third diode are alternately conducted, and the converter is in a resonance state.
Fig. 1 is a schematic diagram of an inductively coupled power transfer device according to the present invention, for illustrating a transfer device for converting dc power into ac power with high frequency and providing power to a secondary stage by means of electromagnetic coupling. The inductively coupled electric energy transmission device comprises a bus capacitor 1, an anti-reflux diode 2, a primary capacitor 3 (Cp), a converter 4, a primary inductor 5 (Lp) and a secondary load 6.
The converter 4 includes an A1 port, an A2 port, a B1 port, a B2 port, a B3 port, and a B4 port.
Two ends of the bus capacitor 1 are respectively connected with an external power supply UDC+ port and a UDC-port; the positive end of the anti-reflux diode 2 is connected with an external power supply UDC+ port, and the negative end of the anti-reflux diode is connected with an A1 port of the converter 4; and an external power supply UDC-port is connected with an A2 port of the converter 4.
One end of the primary capacitor 3 is connected with the B1 port of the converter 4, and the other end of the primary capacitor is connected with the B3 port; one end of the primary inductor 5 is connected with the B2 port of the current transformer 4, and the other end of the primary inductor is connected with the B4 port of the current transformer 4.
An electromagnetic induction flux linkage exists between the primary inductance 5 and the secondary load 6, by means of which electromagnetic induction flux linkage the energy in the primary inductance 5 is transferred to the secondary.
Fig. 2 is a schematic diagram of an application topology of the current transformer 4 of the inductively coupled power transmission device according to the present invention in a first operating state, referring to fig. 2, in which the A1 port and the B2 port of the current transformer 4 are connected, and the A2 port and the B4 port are connected. The external power supply UDC injects current ib into an A1 port of the converter through the anti-reflux diode 2, and the current ib injected into the A1 port flows out of a B2 port to form current ip which is injected into the primary inductor 5 (Lp);
fig. 3 is a schematic diagram of an application topology of the current transformer 4 of the inductively coupled power transfer apparatus according to the present invention in a second operating state. Referring to fig. 3, in the second operating state, the B1 port of the current transformer 4 is connected to the B2 port, and the B3 port is connected to the B4 port. The primary capacitor 3 forms a resonant tank with the primary inductor 5, the system starts to resonate and a resonant current ic=ip is formed.
Fig. 4 is a schematic topology diagram of a first embodiment of a current transformer 4 of an inductively coupled power transfer apparatus according to the present invention. Referring to fig. 4, the converter 4 includes a first power switch 41, a second power switch 42, a third power switch 43, a first diode 44, a second diode 45, and a third diode 46. The first diode 44 is a body diode of the first power switch 41, the second diode 45 is a body diode of the second power switch 42, and the third diode 46 is a body diode of the third power switch 43.
With continued reference to fig. 4, the drain of the first power switch 41 is connected to the A1 port of the current transformer 4, the source is connected to the B1 port, the drain of the second power switch 42 is connected to the B1 port of the current transformer 4, the source is connected to the B2 port, the drain of the third power switch 43 is connected to the B3 port of the current transformer 4, the source is connected to the B4 port, and the A2 port of the current transformer 4 is connected to the B4 port.
Fig. 5 is a schematic diagram of a secondary load 6 of an inductively coupled power transfer apparatus according to a first embodiment of the present invention. Referring to fig. 5, the secondary load 6 includes a secondary inductance 61, a compensation capacitance 62, and a load 63. The compensation capacitor 62 may be connected in series or parallel with the secondary inductor 61 to form a secondary compensation loop. The output of the secondary compensation loop drives the load 63 to which energy is supplied, and in some cases the compensation capacitor 62 may default, the secondary inductance being directly connected to the load 63 to which energy is supplied.
Fig. 6 is a schematic diagram of a secondary load 6 of an inductively coupled power transfer apparatus according to a second embodiment of the present invention. As shown in fig. 6, the secondary load 6 includes a metal member 64. When an alternating current flows through the primary inductance 5, an alternating magnetic field is generated, which transfers energy to the secondary load 6 via the electromagnetic coupling flux linkage, and eddy currents are induced in the metal part 64. The induced eddy currents heat the metallic article 64.
Fig. 7 is a schematic timing waveform diagram of a first embodiment of a current transformer of an inductively coupled power transmission device according to the present invention, where the schematic waveform diagram is used to illustrate the relationship between the operation timings of the first power switch 41, the second power switch 42, and the third power switch 43 and the system operation state in the current transformer 4. S1, S2, S3 indicate on/off states of the first power switch 41, the second power switch 42, and the third power switch 43, respectively, and high level on/off and low level off.
Referring to fig. 7:
in the interval t1, t2, S1, S2 high, S3 low, the current transformer 4 is in the first operating state, and the primary capacitor voltage 3Uc is clamped at UDC. In this state, the current ib flowing through the anti-reverse diode 2 and flowing into the A1 port linearly rises, and the current ip flowing into the primary inductor 5 likewise linearly rises, with ib=ip. At this point the primary capacitance 3 has no current, ic=0.
In the interval t2, t5, the level of S1 is low, and at least one of the levels S2, S3 is high, and the converter 4 is in the second working state. At this point the system starts to resonate and uc, ip, ic starts to change sinusoidally, ib=0.
In the interval t5, t6, all of S1, S2, S3 are low, and the converter 4 is in the third operating state. At this time uc is clamped at UDC, ib, ip, ic are all 0.
The interval t6 and t10 is a new working period, and the system repeatedly repeats the periods to chop the direct-current power supply UDC into high-frequency alternating current.
With further reference to fig. 7:
at time S1, the converter 4 is switched off from the first operating state to the second operating state. But S3 is delayed by a time until t3 starts to conduct. Note that t3 is chosen after t2 before ip first crosses 0. Such a selection is to create a soft switching condition for S3, the interval t2, t3 being defined as the first transition state of the second operating state.
After the shut-down of the current transformer 4 at time t 4S 2, the current transformer 4 is switched from the second operating state to the third operating state after a time delay until time t 5S 3 is also not elapsed. Such a selection likewise creates a soft switching condition for S3, the interval t4, t5 being defined as the second transition state of the second operating state.
Fig. 8 is a schematic diagram illustrating a first operating state of a first embodiment of a current transformer of an inductively coupled power transfer apparatus according to the present invention. Referring to fig. 7 and 8, in the interval [ t1, t2], the first power switch 41 and the second power switch 42 in the converter 4 are turned on, the port A1 is connected to the port B2, and the port A2 is connected to the port B4. The power supply UDC is applied to said primary inductance 5 via an anti-reflux diode 2, forming a linearly rising current ip.
Fig. 9 is a schematic diagram of a first transition state of a second operating state of a first embodiment of a current transformer of an inductively coupled power transfer apparatus according to the present invention. Referring to fig. 7 and 9, in the interval [ t2, t3], the first power switch 41 is turned off and the second power switch 42 is turned on in the converter 4, and note that the third power switch 43 is not turned on at this time. Since the first power switch 41 is turned off, the power supply UDC stops injecting current into the primary inductor 5, but since the current ip in the primary inductor 5 cannot be suddenly changed, the third diode 46 is turned on to provide a channel for the current ip. At the same time, since the first power switch 41 is turned off, it is meaningless that the A2 port is connected with the B4 port. At this time, the condition that the B1 port is connected to the B2 port and the B3 port is connected to the B4 port is formed, the primary capacitor 3 and the primary inductor 4 form a resonant tank, and the primary inductor current ip continues to be maintained, but starts to change in a sine rule, and meanwhile, the primary capacitor current ic starts to appear, and ic=ip. Since the third diode 46 is conductive, a soft switching condition of zero voltage conduction is provided for the third power switch 43, resulting in a first transition state of the second operating state.
Fig. 10 is a schematic diagram of a resonant state of a first embodiment of a current transformer of an inductively coupled power transfer device according to the present invention. Since the third power switch 43 is not turned on in the first transition state of the second working state, the resonant tank formed by the primary capacitor 3 and the primary inductor 5 is not complete, and only a current can flow in one direction, so that the third power switch 43 needs to be turned on in the first transition state. Referring to fig. 7 and 10, the third power switch 43 is turned on by zero voltage at time t 3. Therefore, in the interval [ t2, t3], the second power switch 42 and the third power switch 43 are turned on, and the second diode 45 and the third diode 46 are alternately turned on. The resonant tank formed by the primary capacitor 3 and the primary inductor 5 can perform bidirectional current flow, and the system enters a resonant state of the second working state, and uc, ib, ip, ic changes according to a sine rule.
Fig. 11 is a schematic diagram of a second transition state of a first embodiment of a converter of an inductively coupled power transfer device according to the present invention. Referring to fig. 7 and 11, in the interval [ t4, t5], the second diode 45 is in an on state, and thus the second power switch 42 is turned off at zero voltage in the interval [ t4, t5 ]. Since the second power switch 42 is turned off after t4, the resonant tank formed by the primary capacitor 3 and the primary inductor 5 returns to the unidirectional conductive state to prepare for the system to exit the second operating state, so [ t4, t5] is referred to as a second transition state of the second operating state. In the second transition state of the second operating state, uc, ib, ip, ic all vary sinusoidally. When the time t5 is reached, ip is reduced to 0, so that the third power switch 43 can be turned off under the zero-current soft switching condition, and the system exits the second working state and enters the third state.
Referring to fig. 7 and 8, it can be seen that the magnitude of the primary inductor current ip injected in the time period t1, t2 can be changed by changing the duration of the first operating state of the current transformer 4, so as to change the magnetic field energy, thereby achieving the purpose of controlling the system power.
With further reference to fig. 7 and fig. 9 and fig. 10 and fig. 11, it can be seen that in the time period [ t2, t5], the duration of the second working state of the current transformer 4 is completely determined by the resonant tank parameter formed by the primary capacitor 3 and the primary inductor 4, that is, the system can adapt to the system parameter variation, so as to achieve the purpose of automatically tracking the working frequency of the system.
It is to be understood that, in fig. 2, 3, 8, and 11, the components and circuits through which current flows are shown by thick solid lines, and the components and circuits through which no current flows are shown by thin solid lines.
The electromagnetic induction energy transfer device provided by the embodiment of the invention can decouple the frequency tracking process and the energy injection process by configuring the converter with a variable switch structure, so that the topological structure of self-adaptive resonance of the system working frequency and power regulation of variable period is achieved, and the problems of frequency tracking, power control difficulty and the like caused by contradiction between system parameter time variation and resonance frequency constraint and system parameter time variation in the prior art are solved. In addition, the topological structure provided by the embodiment of the invention has the characteristics of simple and convenient switch control strategy, constant operation of the switch under the soft switch condition and the like.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An inductively coupled electrical energy transfer apparatus, comprising:
a bus capacitor; an anti-reflux diode; a primary capacitance; a current transformer; a primary inductance; a secondary load;
the bus capacitor is connected with an external power supply UDC+ port and a UDC-port at two ends respectively;
the converter comprises a port A1, a port A2, a port B1, a port B2, a port B3 and a port B4;
the positive end of the anti-reflux diode is connected with the external power supply UDC+ port, the negative end of the anti-reflux diode is connected with the converter A1 port, and the external power supply UDC-port is connected with the converter A2 port;
one end of the primary capacitor is connected with the port B1 of the current transformer, the other end of the primary capacitor is connected with the port B3 of the current transformer, and one end of the primary inductor is connected with the port B2 of the current transformer, and the other end of the primary inductor is connected with the port B4 of the current transformer;
an electromagnetic induction flux linkage exists between the primary inductor and the secondary load, and energy in the primary inductor is transferred to the secondary load through the electromagnetic induction flux linkage;
if the converter is in the first working state, the port A1 of the converter is connected with the port B2, and the port A2 is connected with the port B4; the external power supply UDC injects current to an A1 port of the converter through the anti-reflux diode, and the current injected into the A1 port flows out through a B2 port and is injected into the primary inductor;
if the converter is in the second working state, the port B1 of the converter is connected with the port B2, the port B3 of the converter is connected with the port B4, the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are connected through the port B1, the port B2, the port B3 and the port B4 of the converter to form a resonant tank to generate resonance;
if the converter is in the third working state, the converter A1 port, the converter A2 port, the converter B1 port, the converter B2 port, the converter B3 port and the converter B4 port are respectively separated and disconnected; the external power supply UDC stops injecting current into the converter, and the primary capacitor and the primary inductor are mutually isolated to stop resonance;
during the first and second operating states, the primary inductor transfers energy to the secondary load through the electromagnetic induction flux linkage.
2. The inductively coupled power transfer apparatus of claim 1 wherein the current transformer comprises a first power switch, a second power switch, a third power switch, a first diode, a second diode, and a third diode.
3. An inductively coupled power transfer device as claimed in claim 1, wherein the secondary load comprises a secondary inductance and/or a secondary capacitance in parallel or series with the secondary inductance, there being an electromagnetic induction flux linkage between the secondary inductance and the primary inductance through which energy in the primary inductance is transferred to the secondary load.
4. An inductively coupled electrical energy transfer apparatus as recited in claim 3, wherein the secondary load comprises a metal to be heated.
5. An inductively coupled power transfer apparatus as recited in claim 1 or 3, wherein the primary and secondary inductors are provided with magnetic cores.
6. The inductively coupled power transfer apparatus of claim 2, wherein the first diode is a body diode of the first power switch, the second diode is a body diode of the second power switch, and the third diode is a body diode of the third power switch.
7. An inductively coupled power transfer apparatus as recited in claim 1, wherein the primary capacitor voltage is clamped at the bus capacitor voltage when the current transformer is in the first operating state and the third operating state.
8. The inductively coupled power transfer apparatus of claim 2, wherein the converter operating state control strategy is:
when the first power switch, the second power switch and the third power switch are all turned off, the converter is in a third working state; when the first power switch and the second power switch are turned on and the third power switch is turned off, the converter is in a first working state; when the first power switch is turned off, the second power switch is turned on, the third power switch is turned on, or the second power switch and the third power switch are all turned on, the converter is in a second working state.
9. The inductively coupled power transfer apparatus of claim 8, wherein the control of the first, second, and third power switch sequences controls the converter to operate in the following order: the first working state, the second working state, the third working state and the first working state, or the first working state, the second working state and the first working state are cyclically and reciprocally carried out according to the rule.
10. The inductively coupled electrical energy transfer apparatus of claim 1, wherein the second operational state of the current transformer comprises a first transitional state, a resonant state, and a second transitional state; when the second power switch is conducted and the third diode is conducted, the converter is in the first transition state; when the third power switch is conducted and the second diode is conducted, the converter is in the second transition state; when the second power switch and the third power switch are conducted, the second diode and the third diode are alternately conducted, and the converter is in a resonance state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310402254.5A CN116345721A (en) | 2023-04-14 | 2023-04-14 | Inductively coupled electric energy transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310402254.5A CN116345721A (en) | 2023-04-14 | 2023-04-14 | Inductively coupled electric energy transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116345721A true CN116345721A (en) | 2023-06-27 |
Family
ID=86889451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310402254.5A Pending CN116345721A (en) | 2023-04-14 | 2023-04-14 | Inductively coupled electric energy transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116345721A (en) |
-
2023
- 2023-04-14 CN CN202310402254.5A patent/CN116345721A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jiang et al. | A joint control with variable ZVS angles for dynamic efficiency optimization in wireless power transfer system | |
| Ahmed | High-frequency soft-switching ac conversion circuit with dual-mode PWM/PDM control strategy for high-power IH applications | |
| Kim et al. | Analysis and design of a multioutput converter using asymmetrical PWM half-bridge flyback converter employing a parallel–series transformer | |
| CN104617685A (en) | Contactless inductive power transmission control device and method thereof | |
| CN210608706U (en) | Induction type wireless power transmission system for realizing constant-current and constant-voltage output switching | |
| Xu et al. | Overall loss compensation and optimization control in single-stage inductive power transfer converter delivering constant power | |
| CN109906538B (en) | Power transmitter and method for wirelessly transmitting power | |
| Fnato et al. | Wireless power distribution with capacitive coupling excited by switched mode active negative capacitor | |
| Namadmalan et al. | A current-fed parallel resonant push-pull inverter with a new cascaded coil flux control for induction heating applications | |
| Sarnago et al. | High-performance and cost-effective ZCS matrix resonant inverter for total active surface induction heating appliances | |
| CN108964289B (en) | ECPT system with double T-shaped resonant networks and parameter design method thereof | |
| CN105680577A (en) | Wide-range power adjustable wireless electric energy transmission system and control method thereof | |
| Ge et al. | Dual-independent-output inverter for dynamic wireless power transfer system | |
| CN103596308B (en) | A kind of series resonant equipment for Electromagnetic Heating | |
| Wang et al. | A Battery Wireless Charger With Full Load Range Soft-Switching Operation and Zero-Switching-Loss Inverter | |
| Li et al. | Low-cost single-switch bidirectional wireless power transceiver for peer-to-peer charging | |
| CN116345721A (en) | Inductively coupled electric energy transmission device | |
| Li et al. | Efficient hybrid-modulated single-stage wireless power receiver with continuous DC current | |
| Jain | Resonant power conversion: Insights from a lifetime of experience | |
| Tang et al. | Energy Injection ZVS Full Bridge Converter With Extended Soft-Switching Range | |
| CN113036944B (en) | Wireless energy transmission device | |
| Yachiangkam et al. | Resonant inverter with a variable-frequency asymmetrical voltage-cancellation control for low q-factor loads in induction cooking | |
| Li et al. | A high frequency AC-AC converter for inductive power transfer (IPT) applications | |
| CN110707940A (en) | Improved SWISS rectifier based on phase-shifted full-bridge soft switch | |
| You et al. | A constant current output system for ICPT without complex control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |