CN207135003U - Active rectifier - Google Patents
Active rectifier Download PDFInfo
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- CN207135003U CN207135003U CN201720918089.9U CN201720918089U CN207135003U CN 207135003 U CN207135003 U CN 207135003U CN 201720918089 U CN201720918089 U CN 201720918089U CN 207135003 U CN207135003 U CN 207135003U
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Abstract
The utility model provides a kind of active rectifier, available for wireless charging system.The active rectifier is connected to first to fourth switch element in a manner of bridging, 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
It the utility model is related 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 of wireless charging technology is become 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, the principal element for determining efficiency is 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 receive
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 transmits
Electricity can according to circumstances be varied from, therefore in receiving side, it is necessary to can be directed to what wide electric power range or current range worked
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 in a manner of bridge joint,
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 the diode that four switch element M1~M4 are 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 AC1 and
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 which improving power transmission efficiency just needs to improve the AC/DC conversions of 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
It is small, it can become very big for this each switch element M1~M4 size, in this case, meeting when each switching elements conductive or cut-off
Produce ringing (ringing).Therefore, the conversion efficiency of rectifier can decline.
Utility model content
The utility model is completed to solve the above problems, a kind of for wireless charging system its object is to provide
The wide active rectifier of current margin.
The utility model provides a kind of active rectifier, for wireless power transmission system, the feature of the active rectifier
It is, including：First switching element, second switch element, the 3rd switch element and the 4th switch element；First comparator,
Two comparators, the 3rd comparator and the 4th comparator；First reference voltage switch, the second reference voltage switch, the 3rd ginseng
Examine voltage switches and the 4th reference voltage switch；And the first end of the first switching element and the described 3rd switch member
The first tie point between the first end of part, and the first end of the second switch element and the first of the 4th switch element
The second tie point between end, the wireless power transfer system is connected between first tie point and second tie point
The power receiver of system, in the first comparator, inverting input is connected with first tie point, non-inverting input with
One end connection of the first reference voltage switch, output end is connected with the second end of the first switching element, and described the
In two comparators, inverting input is connected with second tie point, and non-inverting input switches with second reference voltage
One end connection of device, output end is connected with the second end of the second switch element, in the 3rd comparator, inverting input
Be connected with first tie point, non-inverting input is connected with one end of the 3rd reference voltage switch, output end with
Second end of the 3rd switch element is connected, and in the 4th comparator, inverting input is connected with second tie point,
Non-inverting input is connected with one end of the 4th reference voltage switch, output end and the second of the 4th switch element
End connection, the other end of the first reference voltage switch are connected with the second end of the first switching element, and described second
The other end of reference voltage switch is connected with the second end of the second switch element, the 3rd reference voltage switch
The other end is connected with the second end of the 3rd switch element, the other end and the described 4th of the 4th reference voltage switch
The second end connection of switch 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 control 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 is controlled within the scheduled period according to the result of detection, described second
Holding circuit includes detecting the rising edge of output signal or the second edge detector of trailing edge 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 include 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 utility model also provides a kind of active rectifier, for wireless power transmission system, the spy of the active rectifier
Sign is, 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 of the first switching element
Hold the first end of the 3rd switch element between the first tie point, and the first end of the second switch element with it is described
The second tie point between the first end of 4th switch element, connected between first tie point and second tie point
The power receiver of the wireless power transmission system, in the first comparator, inverting input and first tie point
Connection, non-inverting input are connected with one end of the first reference voltage switch, output end and the first switching element
The connection of the second end, in second comparator, inverting input is connected with second tie point, non-inverting input and institute
One end connection of the second reference voltage switch is stated, output end is connected with the second end of the second switch element, and described first
The other end of reference voltage switch is connected with the second end of the first switching element, the second reference voltage switch
The other end is connected with the second end of the second switch element, is compared at the second end of the 3rd switch element using described second
Compared with the output signal of device, 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 is controlled within the scheduled period according to the result of detection, described second
Holding circuit includes detecting the rising edge of output signal or the second edge detector of trailing edge 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, and 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.
According to the utility model, it can eliminate or minimize what active rectifier worked by the parasitic capacitance of switch element
Time, and can effectively suppressed ringing phenomenon, the conversion efficiency thus, it is possible to improve active rectifier.Therefore, it is possible to carry
For can be in the wide wireless charging system of input current scope while steady operation, available for requiring in efficient system
Efficient active rectifier.
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 embodiment 1 of the present utility model.
Timing diagram when Fig. 3 is each switching elements conductive of active rectifier, (a) represent respectively opening under prior art construction
The delay of element conductive time is closed, (b) represents that the structure based on Fig. 2 of the present utility model suppresses each switching elements conductive time
The schematic diagram of delay.
Timing diagram when Fig. 4 is each switching elements conductive of active rectifier, (a) represent the ring under prior art construction
Phenomenon, (b) represent the design sketch of the structure suppressed ringing phenomenon based on Fig. 2 of the present utility model.
Fig. 5 (a) is the schematic diagram for representing reference voltage switch structure of the present utility model, and (b) is to represent reference voltage
The timing diagram of switch.
Fig. 6 is the schematic diagram for the active rectifier for representing variation 1 of the present utility model.
Fig. 7 is the schematic diagram for the active rectifier for representing embodiment 2 of the present utility model.
Fig. 8 is the schematic diagram for the active rectifier for representing variation 2 of the present utility model.
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 just for the sake of being easier to understand the utility model and what is carried out say
Bright, the utility model can be implemented in a variety of ways, however it is not limited to the mode that this specification is recorded.In addition, without departing from this reality
In the range of new technological thought, various changes, improvement etc. can be implemented to the utility model, these changes, improvement are wrapped
It is contained in the scope of protection of the utility model.
In addition, the term such as " first " that uses in the following description, " second " 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 with another inscape or is connected, and can represent both be directly connected to, and can also represent between both
Connect in succession.In addition, assign identical sign flag to same or analogous inscape.
Hereinafter, it is explained with reference to specific embodiment of the present utility model.
Embodiment 1
Fig. 1 is the concept map for representing wireless charging system, and Fig. 2 is represent embodiment 1 of the present utility model active whole
The schematic diagram of device is flowed, is 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 includes (hereinafter sometimes referred to simply as rectifier)：First~the 4th switch element
M1~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.The parasitism of each switch element itself is represented with the diode that the first~the 4th switch element M1~M4 is 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 formed, and is not particularly limited in the utility model.In addition, as shown in Fig. 2 rectifier 22 can also include first~
4th holding circuit 212~242 and the first~the 4th edge detector 213~243.After rectifier 22 converts AC/DC
Electric power 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 is P-channel type MOS transistor.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 four ratio
Compared with the output signal of device 201~204, VRECT represents the high-side voltage of load.Switch on 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) represent respectively opening under prior art construction
The delay of element conductive time is closed, (b) represents that the structure based on Fig. 2 of the present utility model suppresses each switching elements conductive time
The schematic diagram of delay.
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, delay be present.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 reduce.It is also such for other switch elements.Fig. 3 (a)
This case is shown, wherein, at the time of dotted line represents that prior art construction lower switch element should be switched on, 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 effect of the present utility model, and where the dotted line signifies that is real at the time of each switch element is actually turned in the prior art
Line is represented under structure of the present utility model, at the time of each switching elements conductive, it follows that compared with prior art, respectively opening
The ON time for closing element is substantially shifted to an earlier date.Specifically, by setting the first~the 4th reference voltage switch 211~241, control
Make the input voltage of the non-inverting input of each comparator.In Fig. 3 (b), VREF_G1 represents the first reference voltage switch
211 output, VREF_G2 represent the output of the second reference voltage switch 221.For convenience of description, Fig. 3 (b) illustrate only
The output signal of first and second 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, when tie point AC2 voltage reduces, due to the second reference voltage
The output VREF_G2 of switch 221 is high, so even tie point AC2 voltage is not reduced to 0V, 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 that VREF_G2 becomes needed for 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 can
Improve the conversion efficiency of rectifier.
Timing diagram when Fig. 4 is each switching elements conductive of active rectifier, (a) represent the ring under prior art construction
Phenomenon, (b) represent the design sketch of the structure suppressed ringing phenomenon based on Fig. 2 of the present utility model.
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, ring can be produced as shown in Fig. 4 (a), 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.Such as figure
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, G1 is output it by the first holding circuit 212 and is kept for the scheduled period, thus eliminates 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 detect 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 reference voltage switch structure of the present utility model, and (b) is to represent reference voltage
The timing diagram of switch.As shown in Fig. 5 (a), reference voltage switch can be made up of multiplexer, be cut with the first reference voltage
Exemplified by parallel operation 211, selection signals of the output G1 of first comparator 201 as multiplexer is received, is produced as the first ratio
Compared with the VREF_G1 of the non-inverting input input signal of device 201.Now, VREF1 is 0V, that is, is grounded, and VREF2 is greater than 0V
Voltage, can suitably set, be not particularly limited in this application according to the actual requirements.Fig. 5 (b) is the switching of the first reference voltage
The timing diagram of device 211.It is illustrated in Figure 5 by taking the first reference voltage switch 211 as an example, but other reference voltages are cut
The structure and its sequential of parallel operation are also similar, therefore are omitted the description.
Variation 1
Fig. 6 is the schematic diagram for the active rectifier for representing variation 1 of the present utility model.It is different compared with Fig. 2 structure
Point is, in the rectifier 22 ' shown in Fig. 6, the third and fourth switch element M3 ', M4 ' and N-channel type MOS transistor.Negative
When the high-side of load uses N-channel type MOS transistor, high voltage, high-power wireless charging system, Neng Gouti are applicable to
The conversion efficiency of high rectifier.Due to using N-channel type MOS transistor in high-side, therefore pass through the first boost converter
234 and second boost converter 244 output of the 3rd comparator 203 and the 4th comparator 204 boosting is after-applied to the 3rd He
4th 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 embodiment 2 of the present utility model.Compared with Fig. 2 structure, no
It is that in the rectifier 42 shown in Fig. 7, only there is reference voltage in first switching element M1 and second switch element M2 sides with putting
Switch (411 and 421).In the 3rd switch element M3 gate electrode side, the second comparator 202 is inputted via the first phase inverter 431
Output 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.
In addition, rectifier 42 can also have first and second the 412,422, first and second rim detection circuits 413 of holding circuit,
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 in 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 circuit can be simplified.
Variation 2
Fig. 8 is the schematic diagram for the active rectifier for representing variation 2 of the present utility model.It is different compared with Fig. 7 structure
Point is, in the rectifier 42 ' shown in Fig. 8, the third and fourth switch element M3 ', M4 ' and N-channel type MOS transistor.Negative
When the high-side of load uses N-channel type MOS transistor, high voltage, high-power wireless charging system, Neng Gouti are applicable to
The conversion efficiency of high rectifier.Due to also using N-channel type MOS transistor in high-side, therefore without using phase inverter, and
It is the grid that the output G2 ' of the second comparator 202 is supplied to the 3rd switch element M3 ' by the first boost converter 432, leads to
Cross the grid that the output G1 ' of first comparator 201 is supplied to the 4th switch element M4 ' by the second boost converter 442.Other knots
Structure and effect are identical with Fig. 7 rectifier, therefore the repetitive description thereof will be omitted.
Specific embodiment of the present utility model has been described in detail above, but the utility model is not limited to saying for the above
Bright, the change that is carried out in the range of technological thought of the present utility model, improvement etc. are within the scope of protection of the utility model.
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 the rising edge of output signal or the first side of trailing edge of the first comparator
Edge detector, the first comparator is controlled within the scheduled period according to the result of detection,
Second holding circuit includes detecting the rising edge of output signal or the second side of trailing edge of second comparator
Edge detector, second comparator is controlled within the scheduled period according to the result of detection,
3rd holding circuit includes detecting the rising edge of output signal or the 3rd side of trailing edge of the 3rd comparator
Edge detector, the 3rd comparator is controlled within the scheduled period according to the result of detection,
4th holding circuit includes detecting the rising edge of output signal or the 4th side of trailing edge of the 4th comparator
Edge detector, the 4th comparator is controlled within the scheduled period according to the result of detection.
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 the rising edge of output signal or the first side of trailing edge of the first comparator
Edge detector, the first comparator is controlled within the scheduled period according to the result of detection,
Second holding circuit includes detecting the rising edge of output signal or the second side of trailing edge of second comparator
Edge detector, second comparator is controlled within the scheduled period according to the result of detection.
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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| CN201720918089.9U CN207135003U (en) | 2017-07-26 | 2017-07-26 | Active rectifier |
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| CN201720918089.9U CN207135003U (en) | 2017-07-26 | 2017-07-26 | Active rectifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294409A (en) * | 2017-07-26 | 2017-10-24 | 江西联智集成电路有限公司 | Active rectifier |
| CN111464051A (en) * | 2020-05-09 | 2020-07-28 | 南方科技大学 | Multi-output active rectifier structure and wireless charging circuit |
| WO2022178785A1 (en) * | 2021-02-25 | 2022-09-01 | 华为技术有限公司 | Rectifier and driving method and device therefor |
-
2017
- 2017-07-26 CN CN201720918089.9U patent/CN207135003U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294409A (en) * | 2017-07-26 | 2017-10-24 | 江西联智集成电路有限公司 | Active rectifier |
| CN111464051A (en) * | 2020-05-09 | 2020-07-28 | 南方科技大学 | Multi-output active rectifier structure and wireless charging circuit |
| CN111464051B (en) * | 2020-05-09 | 2023-05-23 | 南方科技大学 | Multiplexed output active rectifier structure and wireless charging circuit |
| WO2022178785A1 (en) * | 2021-02-25 | 2022-09-01 | 华为技术有限公司 | Rectifier and driving method and device therefor |
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