CN105356564B - Wireless energy receives system - Google Patents
Wireless energy receives system Download PDFInfo
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- CN105356564B CN105356564B CN201510904059.8A CN201510904059A CN105356564B CN 105356564 B CN105356564 B CN 105356564B CN 201510904059 A CN201510904059 A CN 201510904059A CN 105356564 B CN105356564 B CN 105356564B
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Abstract
The present invention provides a kind of wireless energy reception system, is used for wireless energy receiving end, including resonance modules, rectification module, control module and drive module.The resonance modules are for receiving wireless energy and a received wireless energy being converted into ac voltage signal.The rectification module is electrically connected to the resonance modules, including multiple field-effect tube, for rectifying to the ac voltage signal.The control module is electrically connected to the rectification module, for exporting multiple timing control signals, controls the multiple field-effect tube to correspond.The drive module is electrically connected to the rectification module and the control module, for amplifying to the multiple timing control signal, to control the switch state of the multiple field-effect tube.Above-mentioned wireless energy receives system using four high-voltage power field-effect tube to carry out full-bridge rectification to the alternating voltage after the conversion of received wireless energy, effectively improves the transfer efficiency of rectifier bridge.
Description
Technical field
The present invention relates to the wireless energies of wireless charging system more particularly to a kind of full-bridge synchronous rectification to receive system.
Background technique
Wireless charging technology is more and more used by mainstream mobile phone production firm due to advantages such as convenient, safety.Mesh
Preceding there are two types of the control modes of mainstream: magnetic induction and magnetic resonance.No matter which kind of control mode is used, for receiving end, all
It needs ac voltage signal to be converted into d. c. voltage signal, could charge to the battery of mobile phone.
However existing receiving end power unit, it is general to carry out full-bridge rectification using four diodes as shown in Figure 1, then
In addition a decompression conversion chip is to charging mobile phone battery；It is either using two diodes and two height as shown in Figure 2
Power NMOS tube is pressed to carry out full-bridge rectification, along with a decompression conversion chip is to charging mobile phone battery.The former is with four two
Pole pipe rectification, due to the conduction voltage drop of diode, when input current is very big, the loss of four diodes can be very big；Though the latter
So with two high-voltage power NMOS tubes instead of two diodes, but still suffer from the loss of two diodes.Meanwhile these
Diode and high-voltage power NMOS are discrete devices, are unfavorable for the integration and miniaturization of receiving end power unit.Therefore have
Necessity proposes that a kind of follow-on wireless energy receives system to overcome drawbacks described above.
Summary of the invention
The object of the present invention is to provide a kind of wireless energies to receive system, can effectively improve received wireless
The rectification of energy, transfer efficiency.
To achieve the goals above, the present invention provides a kind of wireless energy reception system, is used for wireless energy receiving end, packet
Include resonance modules, rectification module, control module and drive module.The resonance modules are for receiving wireless energy and being received
Wireless energy be converted into ac voltage signal.The rectification module is electrically connected to the resonance modules, including multiple field-effects
Pipe, for being rectified to the ac voltage signal.The control module is electrically connected to the rectification module, more for exporting
A timing control signal controls the multiple field-effect tube to correspond.The drive module is electrically connected to the rectification mould
Block and the control module, for being amplified to the multiple timing control signal, to control the multiple field-effect tube
Switch state.
Preferably, it further includes filter module that the wireless energy, which receives system, is electrically connected to the rectification module, for pair
Ac voltage signal after rectification is filtered.
Preferably, the rectification module includes the first NMOS tube, the second NMOS tube, third NMOS tube and the 4th NMOS tube,
The drain electrode of first NMOS tube is electrically connected to the first output end of the resonance modules, and the source electrode of first NMOS tube connects
Ground, the grid of first NMOS tube are electrically connected to the drive module, and the drain electrode of second NMOS tube is electrically connected to described
The second output terminal of resonance modules, the source electrode ground connection of second NMOS tube, the grid of second NMOS tube are electrically connected to institute
State drive module, the drain electrode of the third NMOS tube for the alternating voltage after exporting the rectification, the third NMOS tube
Source electrode is electrically connected to the drain electrode of second NMOS tube and the second output terminal of the resonance modules, the grid of the third NMOS tube
Pole is electrically connected to the drive module, and the drain electrode of the 4th NMOS tube is electrically connected to the drain electrode of the third NMOS tube, described
The source electrode of 4th NMOS tube is electrically connected to the drain electrode of first NMOS tube and the first output end of the resonance modules, and described
The grid of four NMOS tubes is electrically connected to the drive module.
Preferably, the rectification module further includes first capacitor, the second capacitor, first diode and the second diode, institute
The one end for stating first capacitor is electrically connected to the first output end of the resonance modules, and the other end of the first capacitor is electrically connected to
The cathode of the drive module and the first diode, the anode of the first diode be electrically connected to the drive module and
First reference voltage, one end of second capacitor are electrically connected to the second output terminal of the resonance modules, second capacitor
The other end be electrically connected to the cathode of the drive module and second diode, the anode electrical connection of second diode
In the drive module and first reference voltage.
Preferably, the rectification module includes the first NMOS tube, the second NMOS tube, the first PMOS tube and the second PMOS tube,
The drain electrode of first NMOS tube is electrically connected to the first output end of the resonance modules, and the source electrode of first NMOS tube connects
Ground, the grid of first NMOS tube are electrically connected to the drive module, and the drain electrode of second NMOS tube is electrically connected to described
The second output terminal of resonance modules, the source electrode ground connection of second NMOS tube, the grid of second NMOS tube are electrically connected to institute
State drive module, the drain electrode of first PMOS tube be electrically connected to second NMOS tube drain electrode and the resonance modules
Two output ends, the source electrode of first PMOS tube is for exporting the alternating voltage after the rectification, the grid of first PMOS tube
Pole is electrically connected to the drive module, and the drain electrode of second PMOS tube is electrically connected to the drain electrode of first NMOS tube and described
First output end of resonance modules, the source electrode of second PMOS tube are electrically connected to the source electrode of first PMOS tube, and described
The grid of two PMOS tube is electrically connected to the drive module.
Preferably, the control module includes the first sampling unit, the first comparing unit, the first logical unit, the
One voltage conversion unit, the second sampling unit, the second comparing unit, the second logical unit and second voltage converting unit.
First sampling unit is electrically connected to the first output end of the resonance modules, for the first output to the resonance modules
The alternating voltage at end is sampled, to export the first sampled voltage.First comparing unit is electrically connected to first sampling
Unit is used for first sampled voltage and the first reference voltage, to export the first comparison signal, and for described in comparison
First sampled voltage and the second reference voltage, to export the second comparison signal, first logical unit is electrically connected to institute
The first comparing unit is stated, for exporting the first timing control letter according to first comparison signal, second comparison signal
Number and third timing control signal.The first voltage converting unit is electrically connected to first logical unit, for pair
The third timing control signal carries out level conversion.It is second defeated to be electrically connected to the resonance modules for second sampling unit
Outlet, the alternating voltage for the second output terminal to the resonance modules sample, to export the second sampled voltage.It is described
Second comparing unit is electrically connected to second sampling unit, for second sampled voltage and first benchmark electricity
Pressure, to export third comparison signal, and for second sampled voltage and second reference voltage, with output the 4th
Comparison signal.Second logical unit is electrically connected to second comparing unit, for comparing letter according to the third
Number, the 4th comparison signal export the second timing control signal and the 4th timing control signal.The second voltage conversion
Unit is electrically connected to second logical unit, for carrying out level conversion to the 4th timing control signal.
Preferably, first sampling unit includes first resistor, the 5th NMOS tube and second resistance, the first resistor
One end be electrically connected to the first output end of the resonance modules, the other end of the first resistor is electrically connected to the described 5th
The drain electrode of NMOS tube, the source electrode of the 5th NMOS tube are electrically connected to one end and described first of the second resistance relatively singly
Member, the grid of the 5th NMOS tube are electrically connected to the internal electric source of the control module, another termination of the second resistance
Ground；Second sampling unit includes 3rd resistor, the 6th NMOS tube and the 4th resistance, one end electrical connection of the 3rd resistor
In the second output terminal of the resonance modules, the other end of the 3rd resistor is electrically connected to the drain electrode of the 6th NMOS tube,
The source electrode of 6th NMOS tube be electrically connected to the 4th resistance one end and second comparing unit, the 6th NMOS
The grid of pipe is electrically connected to the internal electric source of the control module, the other end ground connection of the 4th resistance；Described first compares
Unit includes the first hysteresis comparator, the second hysteresis comparator, the first phase inverter and the second phase inverter, and first sluggishness is relatively
The positive input of device is electrically connected to one end of the second resistance, the reverse input end electrical connection of first hysteresis comparator
In first reference voltage, the output end of first hysteresis comparator is electrically connected to the input terminal of first phase inverter,
The output end of first phase inverter is electrically connected to first logical unit, second hysteresis comparator it is reversed defeated
Enter one end that end is electrically connected to the second resistance, the positive input of second hysteresis comparator is electrically connected to described second
Reference voltage, the output end of second hysteresis comparator are electrically connected to the input terminal of second phase inverter, and described second is anti-
The output end of phase device is electrically connected to first logical unit；Second comparing unit include third hysteresis comparator,
The positive input of 4th hysteresis comparator, third phase inverter and the 4th phase inverter, the third hysteresis comparator is electrically connected to
One end of 4th resistance, the reverse input end of the third hysteresis comparator are electrically connected to first reference voltage, institute
The output end for stating third hysteresis comparator is electrically connected to the input terminal of the third phase inverter, the output end of the third phase inverter
It is electrically connected to second logical unit, the reverse input end of the 4th hysteresis comparator is electrically connected to the 4th electricity
One end of resistance, the positive input of the 4th hysteresis comparator are electrically connected to second reference voltage, and the described 4th is sluggish
The output end of comparator is electrically connected to the input terminal of the 4th phase inverter, and the output end of the 4th phase inverter is electrically connected to institute
State the second logical unit.
Preferably, the control module include further include enabling unit, be electrically connected to first logical unit and
Second logical unit is patrolled for exporting the first enable signal or the second enable signal with alternately controlling described first
Collect arithmetic element and second logical unit work.
The present invention also provides a kind of wireless energies to receive system, is used for wireless charging receiving terminal, including resonance modules and electricity
Press conversion chip.The resonance modules are for receiving wireless energy and the received wireless energy of institute being converted into alternating voltage letter
Number.The voltage conversion chip is electrically connected to the resonance modules, and the voltage conversion chip includes rectification module, control module
And drive module.The rectification module includes multiple field-effect tube, for rectifying to the ac voltage signal.The control
Molding block controls the multiple field-effect tube for exporting multiple timing control signals, to correspond.The drive module is used
It is amplified in the multiple timing control signal, to control the switch state of the multiple field-effect tube.
Preferably, it further includes filter module that the wireless energy, which receives system, is electrically connected to the voltage conversion chip, is used
It is filtered in the ac voltage signal after rectification.
Beneficial effects of the present invention: the present invention provides a kind of wireless energy reception system, is imitated using four high-voltage power fields
Should pipe come to received wireless energy convert after alternating voltage carry out full-bridge rectification, while can use suitable technique, collection
At into converter chip, the transfer efficiency of rectifier bridge is not only effectively improved, the integrated level of chip is also improved, drops simultaneously
Low production cost.
For further understanding of the features and technical contents of the present invention, it please refers to below in connection with of the invention detailed
Illustrate and attached drawing, however, the drawings only provide reference and explanation, is not intended to limit the present invention.
Detailed description of the invention
Fig. 1 is the full bridge rectifier of wireless charging receiving terminal in one embodiment of the prior art；
Fig. 2 is the full bridge rectifier of wireless charging receiving terminal in another embodiment of the prior art；
Fig. 3 is the module map that wireless energy receives system in an embodiment of the present invention；
Fig. 4 is the circuit diagram that wireless energy receives system in an embodiment of the present invention；
Fig. 5 is the circuit diagram that wireless energy receives system in another embodiment of the present invention；
Fig. 6 is the module map of control module in an embodiment of the present invention；
Fig. 7 is the circuit diagram of control module in an embodiment of the present invention；
Fig. 8 is the key node waveform diagram that wireless energy receives in the circuit diagram of system in Fig. 4.
Specific embodiment
Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention
Example and its attached drawing are described in detail.
Fig. 3 is the module map that wireless energy receives system 100 in an embodiment of the present invention.In the present embodiment, nothing
Heat input receives the receiving end that system 100 can be used in wireless charging, on the handheld terminal as supported wireless charging.Wireless energy
Reception system 100 includes resonance modules 1, rectification module 2, control module 3 and drive module 4.Resonance modules 1 are wireless for receiving
The received wireless energy of institute is simultaneously converted into ac voltage signal by the wireless energy of charging transmitting terminal sending.Rectification module 2 is electrically connected
Resonance modules 1 are connected to, rectification module 2 includes multiple field-effect tube, and preferably 4 field-effect tube constitute full bridge rectifier, whole
The ac voltage signal that flow module 2 is used to export resonance modules 1 rectifies.Control module 3 is electrically connected to rectification module 2,
Control module 3 is for exporting multiple timing control signals, to correspond multiple field-effect tube that control rectification module 2 is included
On or off.Drive module 4 is electrically connected to rectification module 2 and control module 3, since field-effect tube conducting needs certain electricity
The cut-in voltage of pressure value, and the control signal voltage value that control module 3 exports is less than normal, drive module 4 is for defeated to control module 3
Multiple timing control signals out amplify, to control the switch state of multiple field-effect tube.
Please refer to Fig. 4, as a further refinement of the present invention, it further includes filtering that wireless energy, which receives system 100,
Module 5, filter module 5 are electrically connected to rectification module 2, and filter module 5 is used for the ac voltage signal after the rectification of rectification module 2
It is filtered, is charged with exporting charging voltage to handheld device.Filter capacitor can be used to realize filtering in filter module 5.
In an embodiment of the present invention, resonance modules 1 include coil coil, first capacitor C1, the second capacitor C2.Coil
One end of coil is electrically connected to one end of first capacitor C1, and the other end of coil coil is electrically connected to one end of the second capacitor C2,
The other end of second capacitor C2 is electrically connected to the other end of first capacitor C1.In the present embodiment, first capacitor C1's is another
Hold the first output terminals A C1 as resonance modules 1.Second output terminal AC2 of the other end of coil coil as resonance modules 1.
In an embodiment of the present invention, rectification module 2 includes the first NMOS tube Q1, the second NMOS tube Q2, the 3rd NMOS
Pipe Q3 and the 4th NMOS tube Q4, third capacitor BC1, the 4th capacitor BC2, first diode D1 and the second diode D2.First
The source electrode that the drain electrode of NMOS tube Q1 is electrically connected to the first output terminals A C1, the first NMOS tube Q1 of resonance modules 1 is grounded, and first
The grid of NMOS tube Q1 is electrically connected to drive module 4.The drain electrode of second NMOS tube Q2 is electrically connected to the second of the resonance modules
The source electrode of output terminals A C2, the second NMOS tube Q2 are grounded, and the grid of the second NMOS tube Q2 is electrically connected to drive module 2.3rd NMOS
The drain electrode of pipe Q3 is electrically connected to filter module 5, and the drain electrode of third NMOS tube Q3 is for the alternating voltage after exporting rectification, third
The source electrode of NMOS tube Q3 is electrically connected to the drain electrode of the second NMOS tube Q2 and the second output terminal AC2 of resonance modules, third NMOS tube
The grid of Q3 is electrically connected to drive module 4.The drain electrode of 4th NMOS tube Q4 is electrically connected to the drain electrode of third NMOS tube Q3, and the 4th
The source electrode of NMOS tube Q4 is electrically connected to the drain electrode of the first NMOS tube Q1 and the first output terminals A C1 of resonance modules 1, the 4th NMOS tube
The grid of Q4 is electrically connected to drive module 4.One end of third capacitor BC1 is electrically connected to the first output terminals A C1 of resonance modules 1,
The other end of third capacitor BC1 is electrically connected to the cathode of drive module 4 and first diode D1, the anode electricity of first diode D1
It is connected to drive module 4 and the first reference voltage V1, one end of the 4th capacitor BC2 is electrically connected to the second output of resonance modules 1
AC2 is held, the other end of the 4th capacitor BC2 is electrically connected to the cathode of drive module 4 and the second diode D2, the second diode D2's
Anode is electrically connected to drive module 4 and the first reference voltage V1.First diode D1 and the second diode D2 is clamping action, is protected
Demonstrate,prove the drive of the third NMOS tube Q3 or the 4th NMOS tube Q4 when perhaps second output terminal AC2's the first output terminals A C1 is negative
The voltage of dynamic model block 4 can maintain V1 and subtract on the voltage value of a diode forward conduction voltage drop.Here it can also be used
His device, such as the diode or Darlington transistor of triode connection realize first diode D1's and the second diode D2
Function.First NMOS tube Q1, the second NMOS tube Q2, third NMOS tube Q3 and the 4th NMOS tube Q4 can be using high-voltage powers
NMOS tube.
The purpose of third capacitor BC1 and the 4th capacitor BC2 is to guarantee that third NMOS tube Q3 and the 4th NMOS tube Q4 can
Normally.Because the condition of high-voltage power NMOS transistor conduction is that grid voltage Vgate is greater than source voltage Vsource and adds
One turn-on threshold voltage Vth.When the first output terminals A C1 or second output terminal AC2 become positive voltage, due to third capacitor
BC1 and the 4th capacitor BC2 both end voltage cannot be mutated, so the grid voltage of third NMOS tube Q3 or the 4th NMOS tube Q4 are maximum
For V1-Vf+Vac1 or V1-Vf+Vac2.V1 is set as 5V~6V, and Vf is generally 0.6V, and Vth is usually 0.7V, so third
NMOS tube Q3 can be fully on the 4th NMOS tube Q4.
For example, it is assumed that the peak value of input current is Ipk, then half period virtual value is about Irms=0.5*
Ipk, average value are about Iavg=0.32*Ipk, and the conducting resistance of the first NMOS tube Q1 is assumed to 70mohm, then half week
The conduction loss of first NMOS tube in phase are as follows:
Ploss_hvn=2*Irms*Irms*Rdson=0.035*Ipk*Ipk (W)
The conduction voltage drop of general rectifier diode is Vf=0.6V, if substituting the first NMOS tube Q1 with rectifier diode,
The conduction loss of rectifier diode so in half period are as follows:
Ploss_dio=2*Iavg*Vf=0.384*Ipk (W)
Assuming that Ipk=2A, then Ploss_hvn=0.14W, Ploss_dio=0.77W, it is evident that use high-voltage power
The conduction loss of first NMOS tube Q1 of model is much smaller than the conduction loss of diode.
It is that the wireless energy of the another embodiment essentially identical with Fig. 4 receives system 100 please refer to Fig. 5
Circuit diagram, in an embodiment of the present invention, rectification module 2 include the first NMOS tube Q1, the second NMOS tube Q2, the first PMOS
The drain electrode of pipe Q5 and the second PMOS tube Q6, the first NMOS tube Q1 are electrically connected to the first output terminals A C1 of resonance modules 1, and first
The source electrode of NMOS tube Q1 is grounded, and the grid of the first NMOS tube Q1 is electrically connected to drive module 4.The drain electrode of second NMOS tube Q2 is electrically connected
It is connected to the source electrode ground connection of the second output terminal AC2, the second NMOS tube Q2 of resonance modules 1, the grid electrical connection of the second NMOS tube Q2
In drive module 4.The drain electrode of first PMOS tube Q5 is electrically connected to the drain electrode of the second NMOS tube Q2 and the second output of resonance modules 1
AC2 is held, the source electrode of the first PMOS tube Q5 is used to export the alternating voltage after rectification, and the grid of the first PMOS tube Q5 is electrically connected to drive
Dynamic model block 4.The drain electrode of second PMOS tube Q6 is electrically connected to the drain electrode of the first NMOS tube Q1 and the first output end of resonance modules 1
AC1, the source electrode of the second PMOS tube Q6 are electrically connected to the source electrode of the first PMOS tube Q5, and the grid of the second PMOS tube Q6 is electrically connected to drive
Dynamic model block 4.
It should be noted that since drive module 4 is the conducting for driving four field-effect tube in rectification module 2,
Therefore drive module 4 may include four independent driving units, each driving unit, which corresponds, drives each field effect
Ying Guan.In the present embodiment, each driving unit includes buffer.
Please refer to Fig. 6, Fig. 7, in an embodiment of the present invention, control module 3 includes the first sampling unit 31, the
Two sampling units 32, the first comparing unit 33, the second comparing unit 34, the first logical unit 35, the second logical operation list
Member 36, first voltage converting unit 37 and second voltage converting unit 38.First sampling unit 31 is electrically connected to resonance modules 1
First output terminals A C1, the alternating voltage for the first output terminals A C1 to resonance modules 1 sample, with the first sampling of output
Voltage.First comparing unit 33 is electrically connected to the first sampling unit 31, and first for comparing the output of the first sampling unit 31 is adopted
Sample voltage and the first reference voltage V1, to export the first comparison signal, and first for comparing the output of the first sampling unit 31
Sampled voltage and the second reference voltage V2, to export the second comparison signal.First logical unit 35 is electrically connected to the first ratio
Compared with unit 33, for exporting the first timing control signal and third timing control according to the first comparison signal, the second comparison signal
Signal processed.First voltage convert Unit 37 be electrically connected to the first logical unit 35, for third timing control signal into
Line level conversion.Second sampling unit 32 is electrically connected to the second output terminal AC2 of resonance modules 1, for resonance modules 1
The alternating voltage of two output terminals A C2 is sampled, to export the second sampled voltage.Second comparing unit 34 is electrically connected to second and adopts
Sample unit 32, the second comparing unit 34 compare letter for comparing the second sampled voltage and the first reference voltage V1 to export third
Number, and for comparing the second sampled voltage and the second reference voltage V2, to export the 4th comparison signal.Second logical unit
36 are electrically connected to the second comparing unit 34, for exporting the second timing control according to third comparison signal, the 4th comparison signal
Signal and the 4th timing control signal.Second voltage converting unit 38 is electrically connected to the second logical unit 36, for the
Four timing control signals carry out level conversion.
First sampling unit 31 includes first resistor R1, the 5th NMOS tube HVN1 and second resistance R2.First resistor R1's
One end is electrically connected to the first output terminals A C1 of resonance modules 1, and the other end of first resistor R1 is electrically connected to the 5th NMOS tube HVN1
Drain electrode, the source electrode of the 5th NMOS tube HVN1 is electrically connected to one end and the first comparing unit 33 of second resistance R2, the 5th NMOS
The grid of pipe HVN1 is electrically connected to the internal electric source of control module 3, the other end ground connection of second resistance R2.Second sampling unit 32
Including 3rd resistor R3, the 6th NMOS tube HVN2 and the 4th resistance R4, one end of 3rd resistor R3 is electrically connected to resonance modules 1
Second output terminal AC2, the other end of 3rd resistor R3 are electrically connected to the drain electrode of the 6th NMOS tube HVN2, the 6th NMOS tube HVN2's
Source electrode is electrically connected to one end and the second comparing unit 34 of the 4th resistance R4, and the grid of the 6th NMOS tube HVN2 is electrically connected to control
The internal electric source of module 3, the other end ground connection of the 4th resistance R4.First comparing unit 33 include the first hysteresis comparator HYS1,
The positive input of second hysteresis comparator HYS2, the first phase inverter and the second phase inverter, the first hysteresis comparator HYS1 is electrically connected
It is connected to one end of second resistance R2, the reverse input end of the first hysteresis comparator HYS1 is electrically connected to the first reference voltage V1, the
The output end of one hysteresis comparator HYS1 is electrically connected to the input terminal of the first phase inverter, and the output end of the first phase inverter is electrically connected to
The reverse input end of first logical unit 35, the second hysteresis comparator HYS2 is electrically connected to one end of second resistance R2, the
The positive input of two hysteresis comparator HYS2 is electrically connected to the second reference voltage V2, the output end of the second hysteresis comparator HYS2
It is electrically connected to the input terminal of the second phase inverter, the output end of the second phase inverter is electrically connected to the first logical unit 35.Second
Comparing unit 34 includes third hysteresis comparator HYS3, the 4th hysteresis comparator HYS4, third phase inverter and the 4th phase inverter.The
The positive input of three hysteresis comparator HYS3 is electrically connected to one end of the 4th resistance R4, and third hysteresis comparator HYS3's is reversed
Input terminal is electrically connected to the first reference voltage V1, and the output end of third hysteresis comparator HYS3 is electrically connected to the defeated of third phase inverter
Enter end, the output end of third phase inverter is electrically connected to the second logical unit 36, and the 4th hysteresis comparator HYS4's is reversed defeated
Enter one end that end is electrically connected to the 4th resistance R4, the positive input of the 4th hysteresis comparator HYS4 is electrically connected to the second benchmark electricity
V2 is pressed, the output end of the 4th hysteresis comparator HYS4 is electrically connected to the input terminal of the 4th phase inverter, the output end of the 4th phase inverter
It is electrically connected to the second logical unit 36.In the present embodiment, first resistor R1,3rd resistor R3 can be ESD
(Electro-Static discharge, Electro-static Driven Comb) resistance, second resistance R2, the 4th resistance R4 are weak pull-down resistance.The
Five NMOS tube HVN1, the 6th NMOS tube HVN2 are high pressure NMOS pipe.
Control module 3 include further include enabling unit 39, enabling unit 39 be electrically connected to the first logical unit 35 and
Second logical unit 36, enabling unit 39 is for exporting the first enable signal or the second enable signal, alternately to control the
One logical unit 35 and the work of the second logical unit 36, to realize as the second NMOS tube Q2 and the 4th NMOS tube Q4
When conducting, the first NMOS tube Q1 and third NMOS tube Q3 are in off state；At the first NMOS tube Q1 and third NMOS tube Q3
When on state, the second NMOS tube Q2 and the 4th NMOS tube Q4 are in off state, thus can effectively avoid NMOS
Pipe Q1, Q2, Q3, Q4 are opened simultaneously, and are caused rectifier bridge short-circuit, are burnt up metal-oxide-semiconductor.For similarly, the first NMOS tube Q1 in Fig. 5,
The control principle of second NMOS tube Q2, the first PMOS tube Q5 and the second PMOS tube Q6 are also substantially similar.
Citing description is carried out to the circuit theory of control module 3 in an embodiment of the present invention below, it is single with the first sampling
For the circuit module that first 31, first comparing unit 33, the first logical unit 35 and first voltage converting unit 37 are constituted
It is described.Assuming that the initial state of circuit is the first NMOS tube Q1, the second NMOS tube Q2, third NMOS tube Q3, the 4th NMOS tube Q4
All close.When it is high that the first output terminals A C1, which is low second output terminal AC2, electric current can by the first NMOS tube Q1 and
The parasitic body diode of third NMOS tube Q3 charges to filter capacitor.The voltage of the first output terminals A C1 is about one at this time
The pressure drop of a diode, about -0.7V set comparison voltage V1=-0.2V~-0.3V of the first hysteresis comparator HYS1,
So the first hysteresis comparator HYS1 will export high level, become low level after the first phase inverter.First logical operation
After module 35 detects the low level of the first phase inverter output, this state is locked, while the first timing control signal and the
Three timing control signals are got higher, the first NMOS tube Q1 and third NMOS tube Q3 conducting.The voltage of the first output terminals A C1 is about at this time
It is Vac1=-Iin*Rdsq1, it can be much smaller than the pressure drop of diode current flow.When input current Iin slowly becomes smaller, first is defeated
The negative voltage of outlet AC1 also can slowly become smaller, it is assumed here that when Iin=10mA, Vac1=-Iin*Rdsq1, this voltage value is made
For the blanking voltage of the first NMOS tube Q1 and third NMOS tube Q3.As Iin < 10mA, the second hysteresis comparator HYS2 output is high
Level becomes low level by the second phase inverter.First logical operation module 35 detects the low level of the second phase inverter output
Afterwards, this state is locked, while the first timing control signal and third timing control signal are lower, the first NMOS tube Q1 and third
NMOS tube Q3 cut-off, hereafter remaining low current will be continued by the body diode of the first NMOS tube Q1 and third NMOS tube Q3 parasitism
Stream charges to filter capacitor.Next cycle, the first output terminals A C1 be height, second output terminal AC2 be it is low, according to essentially identical
Principle open or cut-off the second NMOS tube Q2 and the 4th NMOS tube Q4.
It should be noted that rectification module 2, control module 3 and drive module 4 can integrate in BUCK chip or
In LDO chip, wireless receiving circuit integrated level can be improved in this way, wiring is simple, while reducing production cost.Therefore, originally
It invents and also describes a kind of wireless energy reception system 100, including resonance modules 1 and voltage conversion chip 6 in an embodiment,
Voltage conversion chip 6 can be the chip of the voltage conversion functions such as BUCK chip or LDO chip.Resonance modules 1 are for receiving
The received wireless energy of institute is simultaneously converted into ac voltage signal by wireless energy.Voltage conversion chip 6 is electrically connected to resonance modules
1, it include rectification unit, control unit and driving unit inside voltage conversion chip 6.Rectification unit includes multiple field-effect tube,
Ac voltage signal for exporting to resonance modules 1 rectifies.Control unit is used to export multiple timing control signals, with
It corresponds and controls multiple field-effect tube.Driving unit is multiple to control for amplifying to multiple timing control signals
The switch state of field-effect tube.In the present embodiment, wireless energy receive system 100 can by certain integrated technique come
It realizes, principle is identical as above-mentioned wireless energy reception system principle, and details are not described herein.
Fig. 8 show the key node waveform diagram in wireless energy reception system circuit diagram shown in Fig. 4.Vac1 and Vac2
It is the voltage waveform of the first output terminals A C1 and second output terminal AC2 two o'clock respectively, they are opposite in phase, the identical friendship of amplitude
Galvanic electricity pressure；Iac1 and Iac2 is the current waveform of the first output terminals A C1 and the outflow of second output terminal AC2 two o'clock, they are phases
On the contrary, the identical alternating current of amplitude.VRECT is the direct current after the first output terminals A C1 and second output terminal AC2 full-bridge rectification
Pressure.It when negative voltage occurs in the first output terminals A C1, just has negative current and flows through the first NMOS tube Q1, when detecting that Vac1 is greater than
When setting value, there are a high level narrow spaces in the first phase inverter, and the first timing control signal of triggering is got higher, third timing control
Signal is also got higher, and then this state is locked, and until Iac1 electric current is reduced to setting value, a high level occurs in the second phase inverter
Narrow spaces, the first timing control signal of triggering are lower, and third timing control signal is also lower, and then this state is locked.Later,
First output terminals A C1 becomes positive voltage, and second output terminal AC2 becomes negative voltage.After undergoing one section of dead time Toverlap,
Start the negative voltage of detection second output terminal AC2 again.When negative pressure occurs in second output terminal AC2, just has negative current and flow through
Two NMOS tube Q2, when detecting that Vac2 is greater than the set value, there are a high level narrow spaces in third phase inverter, when triggering second
Sequence control signal is got higher, and the 4th timing control signal is also got higher, and then this state is locked, until Iac2 electric current is reduced to setting
There are a high level narrow spaces in value, the 4th phase inverter, and the second timing control signal of triggering is lower, the 4th timing control signal
It is lower, then this state is locked.In this way, the above-mentioned movement of each period continuous repetitive cycling.
In conclusion wireless energy provided by the invention receives system, docked using four high-voltage power field-effect tube
Alternating voltage after the wireless energy conversion of receipts carries out full-bridge rectification, while can use suitable technique, is integrated into converter
In chip, the transfer efficiency of rectifier bridge is not only effectively improved, also improves the integrated level of chip, while reducing and being produced into
This.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the claims in the present invention
Protection scope.
Claims (5)
1. a kind of wireless energy receives system, it to be used for wireless charging receiving terminal characterized by comprising
Resonance modules, for receiving wireless energy and the received wireless energy of institute being converted into ac voltage signal；
Rectification module is electrically connected to the resonance modules, including multiple field-effect tube, for carrying out to the ac voltage signal
Rectification；
Control module is electrically connected to the rectification module, for exporting multiple timing control signals, to correspond described in control
Multiple field-effect tube；And
Drive module is electrically connected to the rectification module and the control module, for the multiple timing control signal into
Row amplification, to control the switch state of the multiple field-effect tube；
Further include filter module, be electrically connected to the rectification module, for being filtered to the ac voltage signal after rectification；
The control module includes:
First sampling unit is electrically connected to the first output end of the resonance modules, defeated for first to the resonance modules
The alternating voltage of outlet is sampled, to export the first sampled voltage；
First comparing unit is electrically connected to first sampling unit, is used for first sampled voltage and the first benchmark
Voltage to export the first comparison signal, and is used for first sampled voltage and the second reference voltage, with the second ratio of output
Compared with signal；
First logical unit is electrically connected to first comparing unit, for according to first comparison signal, described the
Two comparison signals export the first timing control signal and third timing control signal；
First voltage converting unit is electrically connected to first logical unit, for the third timing control signal
Carry out level conversion；
Second sampling unit is electrically connected to the second output terminal of the resonance modules, defeated for second to the resonance modules
The alternating voltage of outlet is sampled, to export the second sampled voltage；
Second comparing unit is electrically connected to second sampling unit, is used for second sampled voltage and described first
Reference voltage, to export third comparison signal, and for second sampled voltage and second reference voltage, with defeated
4th comparison signal out；
Second logical unit is electrically connected to second comparing unit, for according to the third comparison signal, described the
Four comparison signals export the second timing control signal and the 4th timing control signal；And
Second voltage converting unit is electrically connected to second logical unit, for the 4th timing control signal
Carry out level conversion；
First sampling unit includes first resistor, the 5th NMOS tube and second resistance, and one end of the first resistor is electrically connected
It is connected to the first output end of the resonance modules, the other end of the first resistor is electrically connected to the leakage of the 5th NMOS tube
Pole, the source electrode of the 5th NMOS tube be electrically connected to the second resistance one end and first comparing unit, the described 5th
The grid of NMOS tube is electrically connected to the internal electric source of the control module, the other end ground connection of the second resistance；Described second
Sampling unit includes 3rd resistor, the 6th NMOS tube and the 4th resistance, and one end of the 3rd resistor is electrically connected to the resonance
The second output terminal of module, the other end of the 3rd resistor are electrically connected to the drain electrode of the 6th NMOS tube, and the described 6th
The source electrode of NMOS tube be electrically connected to the 4th resistance one end and second comparing unit, the grid of the 6th NMOS tube
It is electrically connected to the internal electric source of the control module, the other end ground connection of the 4th resistance；First comparing unit includes
First hysteresis comparator, the second hysteresis comparator, the first phase inverter and the second phase inverter, the forward direction of first hysteresis comparator
Input terminal is electrically connected to one end of the second resistance, and the reverse input end of first hysteresis comparator is electrically connected to described
One reference voltage, the output end of first hysteresis comparator are electrically connected to the input terminal of first phase inverter, and described first
The output end of phase inverter is electrically connected to first logical unit, and the reverse input end of second hysteresis comparator is electrically connected
It is connected to one end of the second resistance, the positive input of second hysteresis comparator is electrically connected to the second benchmark electricity
Pressure, the output end of second hysteresis comparator are electrically connected to the input terminal of second phase inverter, second phase inverter
Output end is electrically connected to first logical unit；Second comparing unit include third hysteresis comparator, the 4th late
Stagnant comparator, third phase inverter and the 4th phase inverter, the positive input of the third hysteresis comparator are electrically connected to described
One end of four resistance, the reverse input end of the third hysteresis comparator are electrically connected to first reference voltage, the third
The output end of hysteresis comparator is electrically connected to the input terminal of the third phase inverter, the output end electrical connection of the third phase inverter
The one of the 4th resistance is electrically connected in the reverse input end of second logical unit, the 4th hysteresis comparator
End, the positive input of the 4th hysteresis comparator are electrically connected to second reference voltage, the 4th hysteresis comparator
Output end be electrically connected to the input terminal of the 4th phase inverter, the output end of the 4th phase inverter is electrically connected to described second
Logical unit.
2. wireless energy as described in claim 1 receives system, which is characterized in that the rectification module includes the first NMOS
Pipe, the second NMOS tube, third NMOS tube and the 4th NMOS tube, the drain electrode of first NMOS tube are electrically connected to the resonance modules
The first output end, the source electrode ground connection of first NMOS tube, the grid of first NMOS tube is electrically connected to the driving mould
Block, the drain electrode of second NMOS tube are electrically connected to the second output terminal of the resonance modules, the source electrode of second NMOS tube
Ground connection, the grid of second NMOS tube are electrically connected to the drive module, and the drain electrode of the third NMOS tube is for exporting institute
State rectification after alternating voltage, the source electrode of the third NMOS tube be electrically connected to second NMOS tube drain electrode and the resonance
The second output terminal of module, the grid of the third NMOS tube are electrically connected to the drive module, the leakage of the 4th NMOS tube
Pole is electrically connected to the drain electrode of the third NMOS tube, and the source electrode of the 4th NMOS tube is electrically connected to the leakage of first NMOS tube
The grid of first output end of pole and the resonance modules, the 4th NMOS tube is electrically connected to the drive module.
3. wireless energy as claimed in claim 2 receives system, which is characterized in that the rectification module further includes the first electricity
Appearance, the second capacitor, first diode and the second diode, one end of the first capacitor are electrically connected to the of the resonance modules
One output end, the other end of the first capacitor is electrically connected to the cathode of the drive module and the first diode, described
The anode of first diode is electrically connected to the drive module and the first reference voltage, and one end of second capacitor is electrically connected to
The second output terminal of the resonance modules, the other end of second capacitor are electrically connected to the drive module and the described 2nd 2
The cathode of pole pipe, the anode of second diode are electrically connected to the drive module and first reference voltage.
4. wireless energy as described in claim 1 receives system, which is characterized in that the rectification module includes the first NMOS
Pipe, the second NMOS tube, the first PMOS tube and the second PMOS tube, the drain electrode of first NMOS tube are electrically connected to the resonance modules
The first output end, the source electrode ground connection of first NMOS tube, the grid of first NMOS tube is electrically connected to the driving mould
Block, the drain electrode of second NMOS tube are electrically connected to the second output terminal of the resonance modules, the source electrode of second NMOS tube
Ground connection, the grid of second NMOS tube are electrically connected to the drive module, and the drain electrode of first PMOS tube is electrically connected to institute
The drain electrode of the second NMOS tube and the second output terminal of the resonance modules are stated, the source electrode of first PMOS tube is described for exporting
Alternating voltage after rectification, the grid of first PMOS tube are electrically connected to the drive module, the leakage of second PMOS tube
Pole is electrically connected to the drain electrode of first NMOS tube and the first output end of the resonance modules, the source electrode of second PMOS tube
It is electrically connected to the source electrode of first PMOS tube, the grid of second PMOS tube is electrically connected to the drive module.
5. wireless energy as described in claim 1 receives system, which is characterized in that the control module further includes enabled single
Member is electrically connected to first logical unit and second logical unit, for export the first enable signal or
Second enable signal, alternately to control first logical unit and second logical unit work.
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| CN201510904059.8A CN105356564B (en) | 2015-12-09 | 2015-12-09 | Wireless energy receives system |
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| CN201510904059.8A CN105356564B (en) | 2015-12-09 | 2015-12-09 | Wireless energy receives system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106487235B (en) * | 2016-11-30 | 2017-11-10 | 无锡华润矽科微电子有限公司 | Synchronous rectification time schedule controller, wireless charging full-bridge synchronous rectification circuit and system |
| CN109861566A (en) * | 2019-03-28 | 2019-06-07 | 南京和若源电气有限公司 | A kind of circuit of synchronous rectification, synchronous rectification method and wireless charging device |
| JP7271256B2 (en) * | 2019-03-28 | 2023-05-11 | ラピスセミコンダクタ株式会社 | power receiving device |
| CN113193753B (en) * | 2020-01-13 | 2023-01-10 | 北京新能源汽车股份有限公司 | Synchronous rectifying device and receiving end module of wireless charging system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447683B (en) * | 2007-11-30 | 2012-05-30 | 郑春吉 | Contactless multi-charger system and controlling method thereof |
| CN104365028A (en) * | 2012-06-22 | 2015-02-18 | 索尼公司 | Processing device, processing method, and program |
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| WO2015105812A2 (en) * | 2014-01-07 | 2015-07-16 | NuVolta Technologies | Harmonic reduction apparatus for wireless power transfer systems |
| MX357520B (en) * | 2014-02-27 | 2018-07-12 | Univ Danmarks Tekniske | On and off controlled resonant dc-dc power converter. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447683B (en) * | 2007-11-30 | 2012-05-30 | 郑春吉 | Contactless multi-charger system and controlling method thereof |
| CN104365028A (en) * | 2012-06-22 | 2015-02-18 | 索尼公司 | Processing device, processing method, and program |
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