CN107294409A - Active rectifier - Google Patents
Active rectifier Download PDFInfo
- Publication number
- CN107294409A CN107294409A CN201710620901.4A CN201710620901A CN107294409A CN 107294409 A CN107294409 A CN 107294409A CN 201710620901 A CN201710620901 A CN 201710620901A CN 107294409 A CN107294409 A CN 107294409A
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- comparator
- switch element
- switch
- active rectifier
- holding circuit
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Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- 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
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of active rectifier, available for wireless charging system.The active rectifier is connected to first to fourth switch element to bridge mode, and each switch element is connected to comparator and reference voltage switch respectively.According to each reference voltage switch, the time that each switch element is worked based on itself parasitic capacitance is eliminated, so as to improve the conversion efficiency of active rectifier.Can be in the wide wireless charging system of input current scope while steady operation, available for the efficient active rectifier required in efficient system therefore, it is possible to provide.
Description
Technical field
The present invention relates to the active rectifier for wireless charging system.
Background technology
With the development of society, electronic equipment is used widely, and its application and quantity are being continuously increased.This
Kind of electronic equipment is required for the supply of power supply substantially, in order to power supply is provided, it is necessary to generator, power transmitter, power receiver,
The various power equipments such as converter.Power converter can divide DC/DC (DC-DC) converter, DC/AC (AC/DC) to become
Parallel operation, AC/DC (ac/dc) converter, are generally referred to as rectifier by AC/DC converters.
In recent years, the IoT such as smart mobile phone, tablet personal computer, intelligent watch, bluetooth earphone, Wearable (Internet of Things) ring
The quantity of the information technoloy equipment used in border is gradually increasing.Therefore, compared with conventional, the demand to wireless charging technology becomes in growth
Gesture.Wireless charging or wireless power transmission can physically be divided into power sending side and power receiving side, using coil or electricity
Sense etc. transmits alternating current.In power sending side, core is DC/AC converters, is AC/DC converters in power receiving side core.
Fig. 1 is the concept map for representing wireless charging system.In wireless charging system, power sending side and power receiving side
Power transmission efficiency it is extremely important, determine efficiency principal element be that DC/AC converters 12 and AC/DC converters 22 are (i.e. whole
Flow device) conversion efficiency.In wireless charging system, in order to obtain stable power transmission, power sending side and power are received
Side is communicated according to the standard of regulation, and power transmission is carried out according to the state of sending side and receiving side.Power transmitter is transmitted
Electricity can according to circumstances be varied from, therefore in receiving side, it is necessary to can be worked for wide electric power range or current range
AC/DC converters (i.e. rectifier).
Fig. 9 represents the active rectifier of the prior art being used in wireless charging system, and (a) represents structural representation,
(b) timing diagram during work is represented.As shown in Fig. 9 (a), the first~the 4th switch element M1~M4 is connected to bridge mode,
Tie point AC1 and second switch element M2 and the 4th switch element between first switching element M1 and the 3rd switch element M3
Power receiver 24 is connected between tie point AC2 between M4, and is connected to the first~the 4th with each switch element respectively
Comparator 201~204.The parasitism electricity of each switch element is represented with four switch element M1~M4 diodes being connected in parallel respectively
Hold.G1~G4 represents the output signal of the first~the 4th comparator 201~204.As shown in Fig. 9 (b), with tie point ACl and the
When exemplified by the output G1 of one comparator 201, when tie point AC1 voltage deteriorates to less than ground potential, first comparator 201 it is defeated
Go out G1 and become high level, first switching element M1 is switched on, and the operation principle of other switch elements is also same.
But, in the active rectifier shown in Fig. 9 (a), for example, after switch element M1 cut-offs, switch element M2 should
Turn on immediately, but be actually difficult to accomplish this point, because existence time postpones in the feedback control loop including comparator,
No matter how quick feedback control is set, this time delay is inevitable.Within time delay, due to switch member
Part is not turned on, therefore is worked by the parasitic capacitance of itself, and this causes the decrease in efficiency of rectifier.
In addition, in wireless charging system, it is desirable to improve the AC/DC conversions that power transmission efficiency is accomplished by improving rectifier
Efficiency, and want to improve the AC/DC conversion efficiencies of rectifier, it is necessary to make the impedance of each switch element M1~M4 in Fig. 9 very
Small, the size for being this each switch element M1~M4 can become very big, in this case, meeting when each switching elements conductive or cut-off
Produce ringing (ringing).Therefore, the conversion efficiency of rectifier can decline.
The content of the invention
The present invention completes to solve the above problems, and its object is to provide a kind of work for wireless charging system
The wide active rectifier of current range.
The present invention provides a kind of active rectifier, and for wireless power transmission system, the active rectifier is characterised by,
Including：First switching element, second switch element, the 3rd switch element and the 4th switch element；First comparator, second are compared
Device, the 3rd comparator and the 4th comparator；First reference voltage switch, the second reference voltage switch, the 3rd reference voltage
Switch and the 4th reference voltage switch；And the of the first end of the first switching element and the 3rd switch element
Between the first tie point between one end, and the first end of the second switch element and the first end of the 4th switch element
The second tie point, the work(of the wireless power transmission system is connected between first tie point and second tie point
In rate receiver, the first comparator, inverting input is connected with first tie point, non-inverting input and described the
One end connection of one reference voltage switch, output end is connected with the second end of the first switching element, and described second compares
In device, inverting input is connected with second tie point, non-inverting input and the one of the second reference voltage switch
End connection, output end is connected with the second end of the second switch element, in the 3rd comparator, inverting input with it is described
First tie point is connected, and non-inverting input is connected with one end of the 3rd reference voltage switch, output end and described the
In the second end connection of three switch elements, the 4th comparator, inverting input is connected with second tie point, noninverting
Input is connected with one end of the 4th reference voltage switch, and output end and the second end of the 4th switch element connect
Connect, the other end of the first reference voltage switch is connected with the second end of the first switching element, second reference
The other end of voltage switches is connected with the second end of the second switch element, the 3rd reference voltage switch it is another
End is connected with the second end of the 3rd switch element, the other end of the 4th reference voltage switch and the described 4th switch
The second end connection of element.
Preferably, the active rectifier also includes the first holding circuit, the second holding circuit, the 3rd holding circuit and the 4th
Holding circuit, first holding circuit controls the first comparator, and the output of the first comparator is kept into the expected time of arrival
Between, second holding circuit controls second comparator, and the output of second comparator is kept into the scheduled period,
3rd holding circuit controls the 3rd comparator, and the output of the 3rd comparator is kept into the scheduled period, institute
State the 4th holding circuit and control the 4th comparator, the output of the 4th comparator is kept into for the scheduled period.
Preferably, first holding circuit includes detecting rising edge or the decline of the output signal of the first comparator
The first edge detector on edge, the first comparator, described second are controlled according to the result of detection within the scheduled period
Holding circuit includes detecting the rising edge or the second edge detector of trailing edge of the output signal of second comparator, according to
The result of detection controls second comparator within the scheduled period, and the 3rd holding circuit includes detection the described 3rd
The rising edge of the output signal of comparator or the 3rd edge detector of trailing edge, according to the result of detection in the scheduled period
Interior control the 3rd comparator, the 4th holding circuit includes detecting the rising edge of the output signal of the 4th comparator
Or the 4th edge detector of trailing edge, the 4th comparator is controlled within the scheduled period according to the result of detection.
Preferably, the first to fourth reference voltage switch is made up of multiplexer.
Preferably, the first switching element and second switch element are N-channel type MOS transistors, the 3rd switch
Element and the 4th switch element are P-channel type MOS transistors.
Preferably, first to fourth switch element is N-channel type MOS transistor.
Preferably, the active rectifier also includes the first boost converter and the second boost converter, described first liter
Pressure converter is connected between the 3rd comparator and the second end of the 3rd switch element, second boost converter
It is connected between the 4th comparator and the second end of the 4th switch element.
The present invention also provides a kind of active rectifier, and for wireless power transmission system, the feature of the active rectifier exists
In, including：First switching element, second switch element, the 3rd switch element and the 4th switch element；First comparator and second
Comparator；First reference voltage switch and the second reference voltage switch；And the first end of the first switching element with
The first tie point between the first end of 3rd switch element, and the second switch element first end and the described 4th
The second tie point between the first end of switch element, connects described between first tie point and second tie point
In the power receiver of wireless power transmission system, the first comparator, inverting input is connected with first tie point,
Non-inverting input is connected with one end of the first reference voltage switch, output end and the second of the first switching element
In end connection, second comparator, inverting input is connected with second tie point, non-inverting input and described second
One end connection of reference voltage switch, output end is connected with the second end of the second switch element, and described first with reference to electricity
The other end of crush-cutting parallel operation is connected with the second end of the first switching element, the other end of the second reference voltage switch
It is connected with the second end of the second switch element, second comparator is utilized at the second end of the 3rd switch element
Output signal, the output signal of the first comparator is utilized at the second end of the 4th switch element.
Preferably, the active rectifier also includes the first holding circuit and the second holding circuit, first holding circuit
The first comparator is controlled, the output of the first comparator is kept for the scheduled period, second holding circuit controls institute
The second comparator is stated, the output of second comparator is kept into for the scheduled period.
Preferably, first holding circuit includes detecting rising edge or the decline of the output signal of the first comparator
The first edge detector on edge, the first comparator, described second are controlled according to the result of detection within the scheduled period
Holding circuit includes detecting the rising edge or the second edge detector of trailing edge of the output signal of second comparator, according to
The result of detection controls second comparator within the scheduled period.
Preferably, the first and second reference voltages switch is made up of multiplexer.
Preferably, the first switching element and second switch element are N-channel type MOS transistors, the 3rd switch
Element and the 4th switch element are P-channel type MOS transistors.
Preferably, the active rectifier also includes the first phase inverter and the second phase inverter, the of the 3rd switch element
Two ends input the output signal of second comparator, the second end warp of the 4th switch element via first phase inverter
The output signal of the first comparator is inputted by second phase inverter.
Preferably, first to fourth switch element is N-channel type MOS transistor.
Preferably, the active rectifier also includes the first boost converter and the second boost converter, and the described 3rd opens
The second end for closing element inputs the output signal of second comparator, the 4th switch via first boost converter
Second end of element inputs the output signal of the first comparator via second boost converter.
In accordance with the invention it is possible to eliminate or minimize active rectifier by switch element parasitic capacitance work when
Between, and being capable of effectively suppressed ringing phenomenon, the conversion efficiency thus, it is possible to improve active rectifier.Therefore, it is possible to provide
Can be in the wide wireless charging system of input current scope while steady operation, available for the height required in efficient system
The active rectifier of efficiency.
Brief description of the drawings
Fig. 1 is the concept map for representing wireless charging system.
Fig. 2 is the schematic diagram for the active rectifier for representing embodiments of the present invention 1.
Timing diagram when Fig. 3 is each switching elements conductive of active rectifier, (a) represents respectively opening under prior art construction
The delay of element conductive time is closed, (b) represents that the structure of Fig. 2 based on the present invention suppresses the delay of each switching elements conductive time
Schematic diagram.
Timing diagram when Fig. 4 is each switching elements conductive of active rectifier, (a) represents the ring under prior art construction
Phenomenon, (b) represents the design sketch of the structure suppressed ringing phenomenon of Fig. 2 based on the present invention.
Fig. 5 (a) is the schematic diagram for representing the reference voltage switch structure of the present invention, and (b) is to represent that reference voltage switches
The timing diagram of device.
Fig. 6 is the schematic diagram for the active rectifier for representing the variation 1 of the present invention.
Fig. 7 is the schematic diagram for the active rectifier for representing embodiments of the present invention 2.
Fig. 8 is the schematic diagram for the active rectifier for representing the variation 2 of the present invention.
Fig. 9 represents the active rectifier of the prior art being used in wireless charging system, and (a) represents structural representation,
(b) timing diagram during work is represented.
Embodiment
In the following description, specific structure and explanation are used for the purpose of being easier to understand the explanation of the present invention and progress,
The present invention can be implemented in a variety of ways, however it is not limited to the mode that this specification is recorded.In addition, in the technology without departing from the present invention
In the range of thought, various changes, improvement etc. can be implemented to the present invention, these changes, improvement are all contained in the protection of the present invention
In the range of.
In addition, the term such as " first ", " second " for using in the following description can be explained specific inscape, but this
A little terms do not limit these inscapes.These terms are only used for distinguishing each inscape.In addition, this specification use certain
One inscape is connected or is connected with another inscape, can represent both be directly connected to, and can also represent between both
Connect in succession.In addition, assigning identical sign flag to same or analogous inscape.
Hereinafter, it is explained with reference to the embodiment of the present invention.
Embodiment 1
Fig. 1 is the concept map for representing wireless charging system, and Fig. 2 is the active rectifier for representing embodiments of the present invention 1
Schematic diagram, be the schematic diagram for the concrete structure for representing the AC/DC converters (i.e. rectifier) 22 in Fig. 1.
As shown in Fig. 2 active rectifier 22 (hereinafter sometimes referred to simply as rectifier) includes：First~the 4th switch element
MI~M4, the reference voltage switch 211~241 of the first~the 4th comparator the 201~204, first~the 4th, first switching element
The connection between tie point AC1 and second switch element M2 and the 4th switch element M4 between M1 and the 3rd switch element M3
Point AC2.Each switch element parasitism of itself is represented with the first~the 4th switch element M1~M4 diodes being connected in parallel respectively
Electric capacity.Power receiver 24 is connected between tie point AC1 and tie point AC2, this connect power receiver 24 can by inductor and
Capacitor is constituted, and is not particularly limited in the present invention.In addition, as shown in Fig. 2 rectifier 22 can also include the first~the 4th
The edge detector 213~243 of holding circuit the 212~242 and first~the 4th.Rectifier 22 AC/DC is converted after electric power
It is supplied to load.
As shown in Fig. 2 first switching element M1 and second switch element M2 are N-channel type MOS transistors, the 3rd switch member
Part M3 and the 4th switch element M4 are P-channel type MOS transistors.By taking first switching element M1 as an example, its grid is compared with first
The output end of device 201 is connected, and one end also with the first reference voltage switch 211, one end phase of the first holding circuit 212
Even, drain electrode is connected with tie point AC1, and source electrode is grounded；The inverting input of first comparator 201 is connected with tie point AC1, its
Non-inverting input is connected with the other end of the first reference voltage switch 211.Second~the 4th switch element M2~M4 company
Connect also similar to first switching element M1, therefore be not repeated.In fig. 2, G1~G4 represents the first~the 4th ratio
Compared with the output signal of device 201~204, VRECT represents the high-side voltage of load.On the switching of the first~the 4th reference voltage
The structure of device 211~241 will be aftermentioned.
Timing diagram when Fig. 3 is each switching elements conductive of active rectifier, (a) represents respectively opening under prior art construction
The delay of element conductive time is closed, (b) represents that the structure of Fig. 2 based on the present invention suppresses the delay of each switching elements conductive time
Schematic diagram.
Under the structure of the prior art shown in Fig. 9, after first switching element M1 cut-offs (i.e. G1 is low level), tie point
When AC2 is reduced to 0V (ground potential) below, second switch element M2 should be switched on immediately, but actually be difficult to accomplish this
Point.Because, in the feedback control loop including comparator, there is delay.That is, no matter by including the anti-of comparator
How quick feedback control design case obtains, however it remains delay.Within time delay, second switch element M2 can not be switched on, can only
Worked by its parasitic capacitance, therefore the conversion efficiency of rectifier can be reduced.It is also such for other switch elements.Fig. 3 (a)
This case is shown, wherein, at the time of dotted line represents that switch element should be switched under prior art construction, solid line represents existing
At the time of switch element is actually turned in technology.
In the present embodiment, in order to solve this problem, according to the reference input of action each comparator of phase diversity, figure
3 (b) shows the effect of the present invention, and where the dotted line signifies that is at the time of each switch element is actually turned in the prior art, solid line table
Show under the structure of the present invention, at the time of each switching elements conductive, it follows that compared with prior art, each switch element
ON time is substantially shifted to an earlier date.Specifically, by setting the first~the 4th reference voltage switch 211~241, each comparison is controlled
The input voltage of the non-inverting input of device.In Fig. 3 (b), VREF_G1 represents the output of the first reference voltage switch 211,
VREF_G2 represents the output of the second reference voltage switch 221.For convenience of description, Fig. 3 (b) illustrate only first and second
The output signal of reference voltage switch, the output signal of the third and fourth reference voltage switch is also identical principle.
As shown in Fig. 3 (b), such as by taking first switching element M1 and second switch element M2 as an example, because of first comparator 201
Output G1 become low level and first switching element M1 ends, during tie point AC2 voltage reduction, due to the second reference voltage
The output VREF_G2 of switch 221 is high, even if therefore tie point AC2 voltage does not reduce full 0 V, feedback control can also be touched
Hair so that second switch element M2 shorting advances.Thereby, it is possible to eliminate or minimize rectifier because of feedback control, based on switch
The Passive Mode time of the parasitic capacitance work of element.Here, the time delay needed for VREF_G2 becomes 0V does not interfere with rectification
The molar behavior of device.Because, for second switch element M2, until for the second comparator turned on next time
Untill the comparison of 202 0V datums, there is the time of abundance.It is also for the 3rd switch element M3 and the 4th switch element M4
Identical principle.As shown in Fig. 3 (b), the ON time of each switch element compared with prior art, is shifted to an earlier date, therefore, it is possible to
Improve the conversion efficiency of rectifier.
Timing diagram when Fig. 4 is each switching elements conductive of active rectifier, (a) represents the ring under prior art construction
Phenomenon, (b) represents the design sketch of the structure suppressed ringing phenomenon of Fig. 2 based on the present invention.
Under the structure of the prior art shown in Fig. 9, in order to improve the AC/DC conversion efficiencies of rectifier, make each switch member
In the case of the becoming large-sized of part M1~M4, as shown in Fig. 4 (a), ring can be produced when each switching elements conductive or cut-off
Phenomenon (ringing).
In the present embodiment, in order to solve this problem, there is provided the first~the 4th holding circuit 212~242.As schemed
Shown in 4 (b), such as by taking the 1st switch element M1 as an example, when it is turned on, the function of first comparator 201 is made within the scheduled period
Failure, outputs it G1 by the first holding circuit 212 and is kept for the scheduled period, thus eliminate ringing.For the second~the
Four switch elements are also identical principle.In addition, the first~the 4th holding circuit 212~242 can also respectively include first~
4th edge detector 213~243, each edge detector detects the rising edge or trailing edge of the output signal of each comparator.Root
According to the testing result of each edge detector, each comparator is controlled, so as to which the output of each comparator is kept into the ticket reserving time.Reference picture
4 understand, compared with prior art, hence it is evident that improve ringing, the conversion efficiency thus, it is possible to improve rectifier.
Fig. 5 (a) is the schematic diagram for representing the reference voltage switch structure of the present invention, and (b) is to represent that reference voltage switches
The timing diagram of device.As shown in Fig. 5 (a), reference voltage switch can be made up of multiplexer, with the first reference voltage switch
Exemplified by 211, the output G1 of first comparator 201 is received as the selection signal of multiplexer, generation is used as first comparator
The VREF_G1 of 201 non-inverting input input signal.Now, VREF1 is 0V, that is, is grounded, and VREF2 is greater than 0V electricity
Pressure, can suitably set, be not particularly limited in this application according to the actual requirements.Fig. 5 (b) is the first reference voltage switch
211 timing diagram.It is illustrated in Figure 5 by taking the first reference voltage switch 211 as an example, but other reference voltages switch
The structure and its sequential of device are also similar, therefore are omitted the description.
Variation 1
Fig. 6 is the schematic diagram for the active rectifier for representing the variation 1 of the present invention.Compared with Fig. 2 structure, difference
It is that in the rectifier 22 ' shown in Fig. 6, the third and fourth switch element M3 ', M4 ' are also N-channel type MOS transistor.In load
High-side use N-channel type MOS transistor when, be applicable to high voltage, high-power wireless charging system, it is possible to increase
The conversion efficiency of rectifier.Due to using N-channel type MOS transistor in high-side, therefore pass through the first boost converter 234
It is with the second boost converter 244 that the output boosting of the 3rd comparator 203 and the 4th comparator 204 is after-applied to third and fourth
Switch element M3 ', M4 ' grid.Other structures and effect are identical with Fig. 2 rectifier, therefore the repetitive description thereof will be omitted.
Embodiment 2
Fig. 7 is the schematic diagram for the active rectifier for representing embodiments of the present invention 2.Compared with Fig. 2 structure, difference
It is that in the rectifier 42 shown in Fig. 7, only there is reference voltage switching in first switching element M1 and second switch element M2 sides
Device (411 and 421).In the 3rd switch element M3 gate electrode side, the defeated of the second comparator 202 is inputted via the first phase inverter 431
Go out G2；In the 4th switch element M4 gate electrode side, the output G1 of first comparator 201 is inputted via the second phase inverter 441.Separately
Outside, rectifier 42 can also have first and second the 412,422, first and second rim detection circuits of holding circuit 413,423.
Other structures and effect are identical with Fig. 2 rectifier, therefore the repetitive description thereof will be omitted.
Compared with Fig. 2 active rectifier 22, due to being eliminated at the third and fourth switch element side (i.e. high-side)
Third and fourth comparator, the third and fourth reference voltage switch, the third and fourth holding circuit, share the first and second ratios
Compared with output G1, G2 of device, therefore, it is possible to simplify circuit.
Variation 2
Fig. 8 is the schematic diagram for the active rectifier for representing the variation 2 of the present invention.Compared with Fig. 7 structure, difference
It is that in the rectifier 42 ' shown in Fig. 8, the third and fourth switch element M3 ', M4 ' are also N-channel type MOS transistor.In load
High-side use N-channel type MOS transistor when, be applicable to high voltage, high-power wireless charging system, it is possible to increase
The conversion efficiency of rectifier.Due to also using N-channel type MOS transistor in high-side, therefore without using phase inverter, but
The output G2 ' of second comparator 202 is supplied to the 3rd switch element M3 ' grid by the first boost converter 432, passed through
The output G1 ' of first comparator 201 is supplied to the 4th switch element M4 ' grid by the second boost converter 442.Other structures
And effect is identical with Fig. 7 rectifier, therefore the repetitive description thereof will be omitted.
The embodiment of the present invention has been described in detail above, but the present invention is not limited to the explanation of the above, at this
Change, improvement for being carried out in the range of the technological thought of invention etc. are within protection scope of the present invention.
Claims (15)
1. a kind of active rectifier, for wireless power transmission system, the active rectifier is characterised by, including：
First switching element, second switch element, the 3rd switch element and the 4th switch element；
First comparator, the second comparator, the 3rd comparator and the 4th comparator；
First reference voltage switch, the second reference voltage switch, the 3rd reference voltage switch and the 4th reference voltage are cut
Parallel operation；And
The first tie point between the first end of the first switching element and the first end of the 3rd switch element, and it is described
The second tie point between the first end of second switch element and the first end of the 4th switch element,
The power receiver of the wireless power transmission system is connected between first tie point and second tie point,
In the first comparator, inverting input is connected with first tie point, non-inverting input and the described first ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the first switching element,
In second comparator, inverting input is connected with second tie point, non-inverting input and the described second ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the second switch element,
In 3rd comparator, inverting input is connected with first tie point, non-inverting input and the described 3rd ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the 3rd switch element,
In 4th comparator, inverting input is connected with second tie point, non-inverting input and the described 4th ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the 4th switch element,
The other end of the first reference voltage switch is connected with the second end of the first switching element,
The other end of the second reference voltage switch is connected with the second end of the second switch element,
The other end of the 3rd reference voltage switch is connected with the second end of the 3rd switch element,
The other end of the 4th reference voltage switch is connected with the second end of the 4th switch element.
2. active rectifier according to claim 1, it is characterised in that
Also include the first holding circuit, the second holding circuit, the 3rd holding circuit and the 4th holding circuit,
First holding circuit controls the first comparator, and the output of the first comparator is kept into the scheduled period,
Second holding circuit controls second comparator, and the output of second comparator is kept into the expected time of arrival
Between,
3rd holding circuit controls the 3rd comparator, and the output of the 3rd comparator is kept into the expected time of arrival
Between,
4th holding circuit controls the 4th comparator, and the output of the 4th comparator is kept into the expected time of arrival
Between.
3. active rectifier according to claim 2, it is characterised in that
First holding circuit includes detecting rising edge or the first side of trailing edge of the output signal of the first comparator
Edge detector, the first comparator is controlled according to the result of detection within the scheduled period,
Second holding circuit includes detecting rising edge or the second side of trailing edge of the output signal of second comparator
Edge detector, second comparator is controlled according to the result of detection within the scheduled period,
3rd holding circuit includes detecting rising edge or the 3rd side of trailing edge of the output signal of the 3rd comparator
Edge detector, the 3rd comparator is controlled according to the result of detection within the scheduled period,
4th holding circuit includes detecting rising edge or the 4th side of trailing edge of the output signal of the 4th comparator
Edge detector, the 4th comparator is controlled according to the result of detection within the scheduled period.
4. active rectifier according to any one of claim 1 to 3, it is characterised in that
The first to fourth reference voltage switch is made up of multiplexer.
5. active rectifier according to any one of claim 1 to 3, it is characterised in that
The first switching element and second switch element are N-channel type MOS transistors,
3rd switch element and the 4th switch element are P-channel type MOS transistors.
6. active rectifier according to any one of claim 1 to 3, it is characterised in that
First to fourth switch element is N-channel type MOS transistor.
7. active rectifier according to claim 6, it is characterised in that
Also include the first boost converter and the second boost converter,
First boost converter is connected between the 3rd comparator and the second end of the 3rd switch element,
Second boost converter is connected between the 4th comparator and the second end of the 4th switch element.
8. a kind of active rectifier, for wireless power transmission system, the active rectifier is characterised by, including：
First switching element, second switch element, the 3rd switch element and the 4th switch element；
First comparator and the second comparator；
First reference voltage switch and the second reference voltage switch；And
The first tie point between the first end of the first switching element and the first end of the 3rd switch element, and it is described
The second tie point between the first end of second switch element and the first end of the 4th switch element,
The power receiver of the wireless power transmission system is connected between first tie point and second tie point,
In the first comparator, inverting input is connected with first tie point, non-inverting input and the described first ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the first switching element,
In second comparator, inverting input is connected with second tie point, non-inverting input and the described second ginseng
One end connection of voltage switches is examined, output end is connected with the second end of the second switch element,
The other end of the first reference voltage switch is connected with the second end of the first switching element,
The other end of the second reference voltage switch is connected with the second end of the second switch element,
The output signal of second comparator is utilized at the second end of the 3rd switch element, in the 4th switch element
The second end utilize the first comparator output signal.
9. active rectifier according to claim 8, it is characterised in that
Also include the first holding circuit and the second holding circuit,
First holding circuit controls the first comparator, and the output of the first comparator is kept into the scheduled period,
Second holding circuit controls second comparator, and the output of second comparator is kept into the expected time of arrival
Between.
10. active rectifier according to claim 9, it is characterised in that
First holding circuit includes detecting rising edge or the first side of trailing edge of the output signal of the first comparator
Edge detector, the first comparator is controlled according to the result of detection within the scheduled period,
Second holding circuit includes detecting rising edge or the second side of trailing edge of the output signal of second comparator
Edge detector, second comparator is controlled according to the result of detection within the scheduled period.
11. the active rectifier according to any one of claim 8 to 10, it is characterised in that
The first and second reference voltages switch is made up of multiplexer.
12. the active rectifier according to any one of claim 8 to 10, it is characterised in that
The first switching element and second switch element are N-channel type MOS transistors,
3rd switch element and the 4th switch element are P-channel type MOS transistors.
13. active rectifier according to claim 12, it is characterised in that
Also include the first phase inverter and the second phase inverter,
Second end of the 3rd switch element inputs the output signal of second comparator via first phase inverter,
Second end of the 4th switch element inputs the output signal of the first comparator via second phase inverter.
14. the active rectifier according to any one of claim 8 to 10, it is characterised in that
First to fourth switch element is N-channel type MOS transistor.
15. active rectifier according to claim 14, it is characterised in that
Also include the first boost converter and the second boost converter,
The output that second end of the 3rd switch element inputs second comparator via first boost converter is believed
Number,
The output that second end of the 4th switch element inputs the first comparator via second boost converter is believed
Number.
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| CN201710620901.4A CN107294409B (en) | 2017-07-26 | 2017-07-26 | Active rectifier |
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| CN201710620901.4A CN107294409B (en) | 2017-07-26 | 2017-07-26 | Active rectifier |
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| CN107294409B CN107294409B (en) | 2023-07-28 |
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| CN107294409B (en) | 2023-07-28 |
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