CN105305974B - The wireless charging drive system of drive device and its application with calibration function - Google Patents
The wireless charging drive system of drive device and its application with calibration function Download PDFInfo
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- CN105305974B CN105305974B CN201410328423.6A CN201410328423A CN105305974B CN 105305974 B CN105305974 B CN 105305974B CN 201410328423 A CN201410328423 A CN 201410328423A CN 105305974 B CN105305974 B CN 105305974B
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Abstract
A kind of drive device with calibration function, its change through sensing resistance sensing operational amplifier, and feed back to operational amplifier by signal caused by offset voltage correction circuit, by abnormal input off-set voltage amount correction zero existing for operational amplifier itself, so that operational amplifier is able to maintain that optkmal characteristics, and can lift it applied to wireless charging drive system and read the accuracy of current value, to reach good output performance and the preferable stability of a system.
Description
Technical field
The invention relates to a kind of drive system, in particular to a kind of nothing of the drive device with calibration function
Micro USB power drive system, it is to return input off-set voltage amount correction caused by operational amplifier through the mode corrected automatically
Zero so that operational amplifier can be corrected at any time according to the change of working environment, to maintain optkmal characteristics, and lift wireless charging
Power drive system reads the accuracy of current value, so that the present invention's can reach good output performance and preferable system
System stability.
Background technology
In general, operational amplifier is an important circuit element in various circuits, can be applied to realize very
More different operational functions, and the fields such as household electrical appliances, industry can be widely used in.
However, due to the limitation of manufacture of semiconductor or integrated circuit technique, such as：It is micro- development, etching difference or
The external force factors such as encapsulation, SMT, IR Reflow, operational amplifier can be all caused nonideal spy to be present in the operation of reality
Property, therefore by the relation of non-ideal factor, the generation of input off-set voltage is had in actual operation amplifier, that is to say, that
For input off-set voltage in addition to operational amplifier characteristic can be caused to be deteriorated, the size of input off-set voltage can more influence follow-up electricity
The total system stability of road design
, can be by OTP processing procedures (One Time Programing in the prior art in order to eliminate input off-set voltage
Process carried out in) using wafer sort (Chip Circuit Probing) or final test (Final level Test)
Correction, extra outer member need to be generally arranged in pairs or groups to reach correction, now crystal is easily because the factor of external force influences to input again
Offset voltage, and then influence the performance and use range of operational amplifier.
In summary, how to solve because of factors such as processing procedure flaw, Semiconductor Physics characteristics, caused operational amplifier it is defeated
Enter the influence of offset voltage, be the problem of present invention is to be solved.
The content of the invention
Above-mentioned relevant in order to solve the problems, such as, a main purpose of the invention is to provide a kind of drive with calibration function
Dynamic device, goes to sense the change of resistance through an operational amplifier.And by the logic control of offset voltage correction circuit
Signal caused by circuit processed, abnormal offset correction is present into operational amplifier itself and be zeroed, effectively maintain operation amplifier
The performance of device.
Above-mentioned relevant in order to solve the problems, such as, another main purpose of the invention is to provide a kind of wireless charging drivetrain
System, goes to sense the change of resistance through an operational amplifier.And by the logic control electricity of offset voltage correction circuit
Signal feeds back to operational amplifier caused by road, and operational amplifier itself is existed into abnormal offset correction is zeroed so that
Operational amplifier is able to maintain that optkmal characteristics, and lifts the accuracy that wireless charging drive system reads current value, to reach
Good output performance and the preferable stability of a system.
According to above-mentioned purpose, the present invention provides a kind of drive device with calibration function, and one end is coupled to a power supply
Unit (Vcc), the other end connect with a ground connection load, and ground connection load is to be energized and activated by power supply unit (Vcc), its
Middle drive device includes：One operation processing unit, has a first end, one second end and one the 3rd end, wherein first end and the
Two ends are connected with the sensing resistance being series between power supply unit (Vcc) and ground connection load, and the two of resistance are sensed through detecting
End obtains a voltage difference signal (Vin), and obtains one first sensing voltage signal and one second sensing voltage signal according to this, simultaneously
First end can receive a reference voltage signal, and interrogate the first sensing voltage signal of input, the second sensing voltage in the 3rd end
Number with reference voltage signal computing after produce an output voltage signal；And an offset voltage correction unit, it is electrically connected at fortune
Processing unit is calculated, to an offset voltage amount caused by correction calculation processing unit, wherein offset voltage correction unit has one
One negative input end of power initiation delay circuit, a comparator and a logic control circuit, wherein comparator is interrogated with reference voltage
Number connection, a positive input terminal then with operation processing unit caused by output voltage signal be connected to form a feedback circuit, through than
In order to learning that offset voltage amount belongs to a positive offset voltage or a negative offset voltage amount after relatively, and a control signal is exported to logic
Control circuit, after power initiation delay circuit is according to an internal rolling counters forward a to time delay set in advance, produce
Raw startup signal gives logic control circuit, so that logic control circuit produces enable signal triggering operation processing unit and moved
Make, and caused by logic control circuit 1 first group of controlling switch signal and one second group of controlling switch signal are fed back into computing
Processing unit, by positive offset voltage or negative offset voltage amount correction zero.
According to above-mentioned purpose, the present invention provides a kind of wireless charging drive system, by a driving with calibration function
Device is connected to be formed with a wireless charging module, and drive device one end is coupled to a power supply unit (Vcc), the other end and one
Ground connection load connects, and ground connection load is to be energized and activated by power supply unit (Vcc), and wherein drive device includes：One fortune
Processing unit is calculated, there is a first end, one second end and one the 3rd end, wherein first end and the second end is with being series at power supply list
A sensing resistance between first (Vcc) loads with ground connection is connected, and the both ends that resistance is sensed through detecting obtain a voltage difference signal
(Vin) one first sensing voltage signal and one second sensing voltage signal are obtained, and according to this, while first end can receive a reference
Voltage signal, and transport the first sensing voltage signal, the second sensing voltage signal and the reference voltage signal of input in the 3rd end
An output voltage signal is produced after calculation；And an offset voltage correction unit, operation processing unit is electrically connected at, to correct
An offset voltage amount caused by operation processing unit, wherein offset voltage correction unit have a power initiation delay circuit, one
One negative input end of comparator and a logic control circuit, wherein comparator is connected with reference voltage signal, and a positive input terminal is then
With operation processing unit caused by output voltage signal be connected to form a feedback circuit, in order to learning offset voltage amount after comparison
Belong to a positive offset voltage or a negative offset voltage amount, and export a control signal to logic control circuit, work as power initiation
After a rolling counters forward a to time delay set in advance of the delay circuit according to inside, produce a startup signal and give logic control
Circuit processed, so that logic control circuit produces enable signal triggering operation processing unit action, and logic control circuit is produced
Raw one first group of controlling switch signal and one second group of controlling switch signal feeds back to operation processing unit, by positive offset voltage
Amount or negative offset voltage amount correction zero.
Via the drive device provided by the present invention with calibration function and its wireless charging drive system of application, can solve
Certainly because of factors such as processing procedure flaw, Semiconductor Physics characteristics, the input off-set voltage of caused operational amplifier, and to by computing
Offset correction caused by amplifier is zeroed, and may be such that operational amplifier can carry out school at any time according to the change of working environment
Just, to maintain optkmal characteristics, and the accuracy that wireless charging drive system reads current value can be lifted, to enable the invention to
Enough reach good output performance and the preferable stability of a system.
Brief description of the drawings
Fig. 1 is the drive device block diagram with calibration function of the present invention；
Fig. 2 is the wireless charging drive system Organization Chart of the present invention；
Fig. 3 is block diagram inside the switching module of the present invention；
Fig. 4 is the positive offset voltage corrective action figure of the present invention；
Fig. 5 is the negative offset voltage amount corrective action figure of the present invention.
Description of reference numerals
1 has the drive device of calibration function
2 wireless charging drive systems
3 wireless charging modules
4 external electronics
10 ground connection loads
12 operation processing units
120 operational amplifiers
121 switching modules
122 output conversion circuits
14 offset voltage correction units
141 power initiation delay circuits
142 comparators
143 logic control circuits
1411 counters
30 output control units
32 output induction coils
A operational amplifier positive input terminals
B operational amplifier negative input ends
C operational amplifier output terminals
S1 first senses voltage signal
S2 second senses voltage signal
Rsense senses resistance
R1First resistor
R2Second resistance
R3 3rd resistor
R44th resistance
Vin input voltage signals
Vos Offset voltage amount
Vos+ Positive offset voltage
Vos- Negative offset voltage amount
Vref Reference voltage signal
VoutOutput voltage signal
Icon Control electric current
Iout output currents
Vcc power supply units
Pon_D starts signal
COS controls signal
CE enable signals
Con_TU1、Con_TU2、Con_TU3、Con_TU4、
First group of controlling switch signal of Con_TU5
Second group of controlling switch signal of Con_SWA, Con_SWB
TU1, TU2, TU3, TU4, TU5 plural groups current-controlled switch
Gm1, Gm2, Gm3, Gm4, Gm5 transduction value
SWA the first current flowing controlling switches
SWB the second current flowing controlling switches
T1 time delays set in advance.
Specific embodiment
Under the influence of process variations, encapsulation stress and the operation temperature change of operational amplifier during fabrication etc., computing
Amplifier can have some nonideal characteristics in the operation of reality, that is, can have a voltage deviation amount, thus reduce fortune
The accuracy of amplifier running is calculated, this voltage deviation amount is referred to as abnormal offset voltage amount by the present invention.To solve this not
Normal offset voltage amount, the present invention mainly discloses a kind of wireless charging drive system, by offset voltage correction circuit
Signal feeds back to operational amplifier caused by logic control circuit, and operational amplifier is produced into abnormal offset voltage amount corrects
Zero, operational amplifier is allowed to be able to maintain that optkmal characteristics and lifting wireless charging drive system read the accurate of current value
Degree.Due to the general principle and function of related wireless charging system, by correlative technology field have usually intellectual energy it is bright
, therefore with following description, only for being described in detail at its feature of the invention.It is in addition, attached in following interior texts
Figure, also do not drawn completely according to actual relative dimensions, it, which is acted on, is only expressing the schematic diagram relevant with feature of present invention.
First, referring to Fig. 1, being the drive device block diagram with calibration function of the invention.As shown in figure 1, have
One end of drive device 1 of calibration function is coupled to a power supply unit (Vcc), and the other end connects with a ground connection load 10, and is grounded
Load 10 is to be energized and activated by power supply unit (Vcc), wherein the drive device 1 with calibration function includes：One
Operation processing unit 12 and an offset voltage correction unit 14.
Then, in the present invention, operation processing unit 12 can be activated by power supply unit VCC, in the present embodiment at computing
Reason unit 12 includes an operational amplifier 120, has a positive input terminal A, a negative input end B and an output end C, and
Positive input terminal A is to receive reference voltage signal (Vref) by a first resistor (R1), and by a second resistance (R2)
It is connected with the one end for sensing resistance Rsense, negative input end B is then by a 3rd resistor (R3) with sensing resistance Rsense's
The other end is connected, and output end C is then connected by the 4th resistance (R4) with negative input end B, to form a feedback circuit
(Feedback Circuit).Assume ideally one, if by reference voltage signal (Vref) with being grounded (GND) phase
Connecing, its output voltage of operational amplifier 120 can be zero, but because being influenceed by non-ideal factor on processing procedure, actually computing
The output voltage of amplifier 120 will not be zero, can have an abnormal offset voltage amount (Vos), so typically applying
During operational amplifier 120, offset voltage amount (Vos) caused by operational amplifier 120 is one of important parameter that need to be considered；Change
Yan Zhi, in order to learn the size of offset voltage amount (Vos) caused by operational amplifier 120, it will usually by operational amplifier 120
Two inputs (A, B) respectively through second resistance (R2) and 3rd resistor (R3), two with a sensing resistance Rsense
End connection, to the offset voltage amount of 120 two inputs of detection calculations amplifier, and senses resistance Rsense and is arranged in supplying
Between electric unit VCC and load 10., it is clear that obtain a voltage difference signal through detecting sensing resistance Rsense both ends
(Vin) one first sensing voltage signal S1 and one second sensing voltage, and according to the voltage difference signal (Vin) of acquisition are obtained
Signal S2, wherein, the first sensing voltage signal S1 is inputted to the negative input end B of operational amplifier 120 via 3rd resistor (R3),
And the second sensing voltage signal S2 is inputted to the positive input terminal A of operational amplifier 120 via second resistance (R2)；In addition, computing
A switching module 121 and an output conversion circuit 122, therefore, operational amplifier have been further included inside amplifier 120
First sensing voltage signal S1 of input, second can be sensed voltage signal S2 and reference voltage signal (Vref) by 120, through interior
The conversion of voltage is carried out to output conversion circuit 122 and produce an output voltage signal after the computing of portion's switching module 121
(Vout)。
Via the above-mentioned explanation to operation processing unit 12, can clearly it know, in IC manufacturing processes, if micro- aobvious
Shadow process is not controlled, it will the input of operational amplifier 120 is caused to mismatch and produces an offset voltage amount
(Vos), now voltage difference is equal to abnormal offset voltage amount (Vos).
Therefore, abnormal offset voltage amount is produced by above-mentioned sensing resistance Rsense detection calculations processing unit 12
(Vos) after, it is also necessary to the correction of abnormal offset voltage amount (Vos) is carried out through offset voltage correction unit 14.The present invention's
Offset voltage correction unit 14 has 141, comparators 142 of a power initiation delay circuit and a logic control circuit
143.Wherein, the negative input end of comparator 142 is connected with reference voltage signal (Vref), and positive input terminal then with calculation process list
Output voltage signal (Vout) connection caused by member 12, to form another feedback circuit, to compare its reference voltage signal
(Vref) with the size of output voltage signal (Vout), to determine that abnormal offset voltage amount (Vos) belongs to a positive offset voltage
Measure (Vos +) or a negative offset voltage amount (Vos -)；Afterwards, the output end of comparator 142 can export a control signal (COS)
To logic control circuit 143.In addition, the power initiation delay circuit 141 of the present invention is connected with a counter 1411, at this
In the embodiment of invention, this counter 1411 can be only fitted to the inside of offset voltage correction unit 14 or outside, and one compared with
In good embodiment, the present invention is to configure counter 1411 in the inside of offset voltage correction unit 14；When power initiation postpones
After circuit 141 counts up to a time delay set in advance according to the counter 1411 of inside, a startup signal can be produced
(Pon_D) logic control circuit 143 is triggered；Then, it is activated in logic control circuit 143 until logic control circuit
During 143 releases, the driving for the control signal (COS) that logic control circuit 143 can export according to comparator 142, production
A raw enable signal (CE), when enable signal (CE) is low voltage level (L), can trigger operation processing unit 12 start into
Row corrective action, and one first group of controlling switch signal caused by logic control circuit 143 is included：Con_TU1、Con_TU2、
Con_TU3, Con_TU4, Con_TU5 include with one second group of controlling switch signal：Con_SWA, Con_SWB feed back to computing
Switching module 121 in the operational amplifier 120 of processing unit 12, those first group of controlling switch is received by switching module 121
Signal (Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5) and turn on plural groups current-controlled switch, lead simultaneously
Enter the corresponding transduction value of those current-controlled switches and a control electric current is obtained after computing, and receive those second group of control and open
Signal (Con_SWA, Con_SWB) is closed, selection starts the one first current flowing control being connected with those current-controlled switches and opened
(SWA) or the second current flowing controlling switch (SWB) (being not depicted in the 1st figure) are closed, according to the first selected current flowing control
System switch (SWA) or the second current flowing controlling switch (SWB), export corresponding control electric current by the institute of operational amplifier 120
Produce abnormal positive offset voltage (Vos +) or negative offset voltage amount (Vos -) be corrected, and produce an output current
The conversion of voltage is carried out to output conversion circuit 122, an output voltage signal (Vout) is produced after conversion, now can be further
Output voltage signal (Vout) is fed back into comparator 142 and judges positive offset voltage (Vos +) or negative offset voltage amount (Vos-) correcting value it is whether enough, if correcting value not enough still suffers from abnormal positive offset voltage (Vos +) or negative offset voltage amount
(Vos -), then it may proceed to produce controlling switch news by the output control signal of comparator 142 (COS) driving logic control circuit 143
Number (Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5, Con_SWA, Con_SWB) feeds back to operation processing unit
In 12 operational amplifier 120, now the level of enable signal (CE) can still keep low voltage level (L), by operational amplifier
Abnormal positive offset voltage (Vos produced by 120 +) or negative offset voltage amount (Vos -) correct to clean state.
Please continue to refer to Fig. 2, for the wireless charging drive system Organization Chart of the present invention.As shown in Fig. 2 wireless charging drives
System 2 is to be connected to be formed with a wireless charging module 3 by a drive device 1 with calibration function, wherein with school
The framework of the drive device 1 of orthofunction is identical with the structure of earlier figures 2, is connected with power supply unit VCC and load, and described is had
The drive device 1 of calibration function is made up of operation processing unit 12 and offset voltage correction unit 14, wherein in this hair
In a bright preferred embodiment, load can be a wireless charging module in graph structure, and wireless charging module 3 in the present embodiment
The output induction coil 32 for having further included an output control unit 30 and being connected with output control unit 30.Work as power supply
After unit VCC actuating operation processing units 12, through being detected in the sensing resistance that concatenates between power supply unit VCC and load 10
Rsense, the voltage difference signal (Vin) for sensing resistance Rsense both ends and being obtained will be detected, the first sensing is obtained according to this
The sensing voltage signal S2 of voltage signal S1 and second, and second is passed through respectively in two inputs (A, B) of operational amplifier 120
Resistance (R2) and 3rd resistor (R3), are connected with the both ends for sensing resistance Rsense, to the both ends of detection calculations amplifier 120
Voltage difference.In IC manufacturing processes, if micro- developing process is not controlled, it will the input of operational amplifier 120 is caused
Mismatch and produce an offset voltage amount (Vos), now voltage difference is equal to abnormal offset voltage amount (Vos)；
Now, it is also necessary to be further transmitted through the correction that offset voltage correction unit 14 carries out abnormal offset voltage amount (Vos).The present invention
Offset voltage correction unit 14 there is 141, comparators 142 of a power initiation delay circuit and a logic control electricity
Road 143.Wherein, the negative input end of comparator 142 is connected with reference voltage signal (Vref), and positive input terminal then with calculation process
Output voltage signal (Vout) caused by unit 12 connects, to form a feedback circuit, to compare its reference voltage signal
(Vref) with the size of output voltage signal (Vout), to determine that abnormal offset voltage amount (Vos) belongs to positive offset electricity
Pressure amount (Vos +) or a negative offset voltage amount (Vos -)；Afterwards, the output end of comparator 142 can export a control signal
(COS) is to logic control circuit 143.In addition, the power initiation delay circuit 141 of the present invention is connected with a counter 1411
Connect, in an embodiment of the present invention, this counter 1411 can be only fitted to the inside of offset voltage correction unit 14 or outside, and
In a preferred embodiment, the present invention is to configure counter 1411 in the inside of offset voltage correction unit 14；When power supply opens
After dynamic delay circuit 141 counts up to a time delay set in advance according to the counter 1411 of inside, one can be produced and opened
Signal (Pon_D) is moved to trigger logic control circuit 143；Then, it is activated in logic control circuit 143 until logic control
During the release of circuit 143, the drive for the control signal (COS) that logic control circuit 143 can export according to comparator 142
It is dynamic, enable signal (CE) is produced, when enable signal (CE) is low voltage level (L), operation processing unit 12 can be triggered and started
Action is corrected, and first group of controlling switch signal caused by logic control circuit 143 is included：Con_TU1、Con_TU2、
Con_TU3, Con_TU4, Con_TU5 include with second group of controlling switch signal：Con_SWA, Con_SWB are fed back at computing
The switching module 121 in the operational amplifier 120 of unit 12 is managed, those first group of controlling switch news is received by switching module 121
Number (Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5), and plural groups current-controlled switch is turned on, import simultaneously
The corresponding transduction value (Gm) of those current-controlled switches obtains a control electric current after computing, and receives those second group of control
Signal (Con_SWA, Con_SWB) is switched, selection starts the one first current flowing control being connected with those current-controlled switches
(SWA) or the second current flowing controlling switch (SWB) (being not depicted in Fig. 1) are switched, according to the first selected current flowing control
System switch (SWA) or the second current flowing controlling switch (SWB), export corresponding control electric current by the institute of operational amplifier 120
Produce abnormal positive offset voltage (Vos +) or negative offset voltage amount (Vos -) be corrected, and produce an output current
The conversion of voltage is carried out to output conversion circuit 122, output voltage signal (Vout) is produced after conversion, now can further will be defeated
Go out voltage signal (Vout) and feed back to comparator 142 to judge positive offset voltage (Vos +) or negative offset voltage amount (Vos -)
Whether correcting value is enough, if correcting value not enough still suffers from abnormal positive offset voltage (Vos +) or negative offset voltage amount (Vos-), then it may proceed to produce controlling switch signal bag by the output control signal of comparator 142 (COS) driving logic control circuit 143
Contain：Con_SWA, Con_SWB, Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5 feed back to operation processing unit
In 12 operational amplifier 120, now the level of enable signal (CE) still keeps low voltage level (L), by operational amplifier 120
Produced abnormal positive offset voltage (Vos +) or negative offset voltage amount (Vos -) correct to clean state；Via above-mentioned
Mode is solved because of the factors such as processing procedure flaw, Semiconductor Physics characteristic, the influence of the input off-set voltage of caused operational amplifier,
It may be such that wireless charging module 3 can sense an external electronic by output induction coil 32, and allow output control unit 30
Current value can accurately be read to be charged to provide external electronic 4, can reach good output performance and preferably
The stability of a system, herein it is noted that heretofore described external electronic 4 can be for 3C electronic products for example：Action
Device, tablet PC, also for can wireless charging any household appliances, be not any limitation as herein.
In the present embodiment, operation processing unit 12 includes an operational amplifier 120, has positive input terminal A, one
An individual negative input end B and output end C, and positive input terminal A is to receive reference voltage signal by a first resistor (R1)
(Vref), and by a second resistance (R2) with sensing resistance Rsense one end it is connected, negative input end B is then by one the
Three resistance (R3) are connected with sensing the resistance Rsense other end, and output end C is then by the 4th resistance (R4) and negative input
B connections are held, to form a feedback circuit.Herein it is noted that second resistance R2 resistance value and 3rd resistor R3 resistance
It is worth identical, and first resistor R1 resistance value is also identical with the 4th resistance R4 resistance value, therefore above-mentioned resistance its resistance characteristic is also
It is identical.
Followed by please continue to refer to Fig. 3, for block diagram inside the switching module of the present invention.As shown in figure 3, switching module
121 one end are connected with the positive input terminal A of operational amplifier 120 with negative input end B, to receive the first sensing voltage signal S1,
Two sensing voltage signal S2 and reference voltage signal (Vref), the other end are then connected with logic control circuit 143, its logic control
Circuit 143 to receive comparator 142 output control signal (COS) and power initiation delay circuit 141 according to inside
Counter 1411, count up to after a time delay set in advance after caused startup signal (Pon_D), logic control circuit
The driving of the 143 control signals (COS) that can be exported according to comparator 142, produces an enable signal (CE), when enable signal
(CE) when being low voltage level, operation processing unit 12 can be triggered and proceed by corrective action, and logic control circuit 143 is produced
First group of raw controlling switch signal includes：Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5 and second group of control
System switch signal includes：The switching module that Con_SWA, Con_SWB are fed back in the operational amplifier 120 of operation processing unit 12
121, switching module 121 can first receive first group of controlling switch signal (Con_TU1, Con_ caused by logic control circuit 143
TU2, Con_TU3, Con_TU4, Con_TU5), and turn on the inside plural groups controlling switch of switching module 121 (TU1, TU2, TU3,
TU4, TU5), to load corresponding transduction value (Gm1, Gm2, Gm3, Gm4, Gm5), and its transduction value is added up and operation amplifier
The transduction value (Gm0_A) of device input is in parallel.Now, the both ends of operation processing unit 12 (A, B) voltage difference with earth terminal respectively
(Vgs1/Vgs2) (this voltage difference includes foregoing caused abnormal offset voltage amount (Vos) magnitude of voltage) is multiplied and controlled
Electric current (Icon) processed, and according to the second group of controlling switch signal (Con_SWA, Con_SWB) received, selection starts and plural number
The the first current flowing controlling switch (SWA) or the second current flowing of group controlling switch (TU1, TU2, TU3, TU4, TU5) connection
Controlling switch (SWB), according to the first selected current flowing controlling switch (SWA) or the second current flowing controlling switch
(SWB) corresponding control electric current (Icon), is exported, by abnormal positive offset voltage produced by operational amplifier 120
(Vos +) or negative offset voltage amount (Vos -) be corrected.
Please continue to refer to Fig. 4, for the positive offset voltage corrective action figure of the present invention.As shown in figure 4, work as power initiation
Afterwards, it is not yet stable in order to avoid the voltage signal (Vcc) of power supply because each external power source supply voltage rising time is different
When, cause logic control circuit to produce malfunction, therefore when the power source is activated can be by power initiation delay circuit according to internal
After rolling counters forward to time delay set in advance (T1), high electricity will be changed into by low voltage level by starting signal (Pon_D)
Level is pressed, represents that the voltage signal (Vcc) of power supply reaches stable, i.e., notification logic control circuit can start to act, and now patrol
Correction can be completed within correction time by collecting control circuit；Therefore after power initiation, to during logic control circuit release,
Enable signal (CE) can be always held at low voltage level, its object is to close output control unit (30), avoid sensing electricity
Voltage accumulation caused by Rsense is hindered in the correction accuracy in offset, influenceing logic control circuit.According to noted earlier, when
After can be by rolling counters forward to set in advance time delay of the power initiation delay circuit according to inside during power initiation, open
Dynamic signal (Pon_D) will be changed into high voltage level by low voltage level, i.e. notification logic control circuit can start to act, and
After comparator provides control signal (COS) to logic control circuit, control signal (COS) can be maintained at a high voltage level, and
The control signal (COS) of comparator judges that current offset voltage amount (Vos) belongs to positive offset voltage (Vos +) when, that is, represent fortune
Calculate amplifier both end voltage difference and be multiplied by offset (i.e. GainA*Vos for gain multiplying power+, wherein GainA=R4/R3=R1/R2), this
When, logic control circuit proceeds by corrective action according to the control signal (COS) of comparator output, first one according to caused by
First group of controlling switch signal includes：Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5, selection conducting is internal to cut
Change module internal plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5), load corresponding transduction value (Gm1, Gm2,
Gm3, Gm4, Gm5), and its transduction value is subjected to computing according to the voltage difference at current operational amplifier both ends and obtains a control electric current
(Icon), the corresponding switching sequence figure of its plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5) refers to figure
4TU1, TU2, TU3, TU4, TU5 waveform, and be Gm1*TU1+Gm2*TU2+Gm3* in the present embodiment control electric current (Icon)
TU3+Gm4*TU4+ Gm5*TU5, then by second group of controlling switch signal (Con_SWA, Con_SWB), selection starts and plural number
The the first current flowing controlling switch (SWA) or the second electric current of group current-controlled switch (TU1, TU2, TU3, TU4, TU5) connection
Flow quantity control switchs (SWB), by caused control electric current Icon=Gm1*TU1+ Gm2*TU2+ Gm3 * TU3+ Gm4 * TU4+
Gm5*TU5 is exported, by abnormal positive offset voltage (Vos produced by operational amplifier +) be corrected, and produce an output
Electric current to output conversion circuit carry out voltage conversion, after conversion produce output voltage signal (Vout), now can further by
Output voltage signal (Vout) feeds back to comparator and judges positive offset voltage (Vos +) correcting value it is whether enough, if correcting value
Not enough still suffer from abnormal positive offset voltage (Vos +), then it may proceed to be patrolled by comparator output control signal (COS) driving
Volume control circuit produce controlling switch signal (Con_TU1, Con_TU2, Con_TU3, Con_TU4, Con_TU5, Con_SWA,
Con_SWB) feed back in the operational amplifier of operation processing unit, operational amplifier is produced into abnormal positive offset voltage
(Vos +) periodically correct zero (Vos +~ 0), that is, each cycle T (T=16 μ) about 0.10 millivolt (mV) of correction fortune
Calculate amplifier positive offset voltage (Vos +).And after automatic calibration circuit completes corrective action, plural groups current-controlled switch
(TU1, TU2, TU3, TU4, TU5) can keep the voltage quasi position set by last time, persistently provide control electric current (Icon) extremely
In operational amplifier；After the amount of correction reaches, it can be low voltage level by high voltage level (H) transition to control signal (COS)
(L), logic control circuit can further additionally plus offset least significant bit (Least Significant Bit,
LSB, i.e. 0.05 millivolt (mV)), its error is reduced once again.After logic control circuit completes corrective action, enable
Signal (CE) can be changed into high voltage level by low voltage level, and until next time, power initiation, logic control circuit will be reset,
Again abnormal offset voltage amount (Vos) is produced to operational amplifier to be corrected and be zeroed.
Then, please continue to refer to Fig. 5, for the negative offset voltage amount corrective action figure of the present invention.As shown in figure 5, work as power supply
After can be by rolling counters forward to set in advance time delay of the power initiation delay circuit according to inside during startup, start news
Number (Pon_D) will be changed into high voltage level by low voltage level, i.e., notification logic control circuit can start to act, and compare
Device provides control signal (COS) to after logic control circuit, and control signal (COS) can be maintained at a low voltage level, and foregoing
Fig. 4 differences are that the control signal (COS) of comparator judges that current offset voltage amount (Vos) belongs to negative offset voltage amount
(Vos -) when, that is, represent that both end voltage difference is multiplied by offset voltage amount (i.e. GainA*Vos for gain multiplying power-, wherein GainA=R4/
R3=R1/R2), now similarly, logic control circuit is that the control signal (COS) exported according to comparator proceeds by correction
Action, first one first group of controlling switch signal according to caused by include：Con_TU1、Con_TU2、Con_TU3、Con_TU4、
Con_TU5, selection conducting switching module inside plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5), loading are relative
The transduction value (Gm1, Gm2, Gm3, Gm4, Gm5) answered, and voltage difference of its transduction value according to current operational amplifier both ends is entered
Row computing obtain a control electric current (Icon), its plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5) it is corresponding
Switching sequence figure refer to Fig. 5 TU1, TU2, TU3, TU4, TU5 waveform, and be in the present embodiment control electric current (Icon)
Gm1*TU1+Gm2*TU2+Gm3*TU3+ Gm4*TU4+Gm5*TU5, then by second group of controlling switch signal (Con_SWA,
Con_SWB), selection starts the first current flowing being connected with plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5)
Controlling switch (SWA) or a second current flowing controlling switch (SWB), by caused control electric current Icon=Gm1*TU1+
Gm2*TU2+ Gm3 * TU3+ Gm4 * TU4+ Gm5*TU5 are exported, by abnormal negative offset voltage produced by operational amplifier
Measure (Vos -) be corrected, and produce one and output current to the conversion that output conversion circuit carries out voltage, output is produced after conversion
Voltage signal (Vout), now output voltage signal (Vout) further can be fed back into comparator and judge negative offset voltage amount
(Vos -) correcting value it is whether enough, if correcting value not enough still suffers from abnormal negative offset voltage amount (Vos -), then it may proceed to
By comparator output control signal (COS) driving logic control circuit produce controlling switch signal (Con_TU1, Con_TU2,
Con_TU3, Con_TU4, Con_TU5, Con_SWA, Con_SWB) feed back in the operational amplifier of operation processing unit, it will transport
Calculate processing unit and produce abnormal negative offset voltage amount (Vos -) periodically correct zero (Vos -, that is, each week ~ 0)
The Hall element negative offset voltage amount (Vos of phase T (T=16 μ) about 0.1 millivolts (mV) of correction -)；And when automatic calibration circuit is complete
Into after corrective action, plural groups current-controlled switch (TU1, TU2, TU3, TU4, TU5) can keep the electricity set by last time
Level is pressed, persistently provides control electric current (Icon) into operational amplifier；After the amount of correction reaches, signal (COS) meeting is controlled
It is high voltage level (H) by low voltage level (L) transition, logic control circuit further additionally can have plus the minimum of offset
Imitate position (Least Significant Bit, LSB, i.e. 0.05 millivolt (mV)), its error is reduced once again.Work as logic
After control circuit completes corrective action, enable signal (CE) can be changed into high voltage level by low voltage level, until next time
Power initiation, logic control circuit will be reset, and producing abnormal offset voltage amount (Vos) to operation processing unit again is carried out
Correct and be zeroed.
In summary, wireless charging drive system of the invention, can effectively be solved because of processing procedure flaw, half by aforesaid way
The factors such as conductor physical characteristic, the influence of the input off-set voltage of caused operational amplifier, it may be such that wireless charging module can
By output induction coil sensing external electronic, and output control unit is allowed accurately to read current value to provide outside
Electronic installation is charged, to reach good output performance and the preferable stability of a system.
Although the present invention is disclosed above with foregoing preferred embodiment, so it is not limited to the present invention, any to be familiar with
Alike those skilled in the art, without departing from the spirit and scope of the present invention, when can make a little change and retouching, therefore the present invention's is special
Sharp protection domain must be defined depending on the claim institute defender appended by this specification.
Claims (9)
1. a kind of drive device with calibration function, it is characterised in that one end is coupled to a power supply unit, and the other end connects with one
Ground load connects, and ground connection load is to be energized and activated by the power supply unit, and wherein the drive device includes：
One operation processing unit, has a first end, one second end and one the 3rd end, wherein the first end and second end be with
The sensing resistance connection being series between the power supply unit and ground connection load, one is obtained through the both ends for detecting the sensing resistance
Voltage difference signal, and one first sensing voltage signal and one second sensing voltage signal are obtained according to this, while the first end can connect
Receive a reference voltage signal, and in the 3rd end by the first sensing voltage signal of input, the second sensing voltage signal with
An output voltage signal is produced after the reference voltage signal computing；And
One offset voltage correction unit, is electrically connected at the operation processing unit, to correct caused by the operation processing unit
One offset voltage amount, wherein the offset voltage correction unit have a power initiation delay circuit, a comparator and a logic control
One negative input end of circuit processed, the wherein comparator is connected with the reference voltage signal, a positive input terminal then with the calculation process
The output voltage signal caused by unit connects to form a feedback circuit, in order to learning that the offset voltage amount belongs to one after comparison
Positive offset voltage or a negative offset voltage amount, and a control signal is exported to the logic control circuit, when the power initiation prolongs
After a rolling counters forward a to time delay set in advance of the slow circuit according to inside, produce a startup signal and give the logic control
Circuit processed, so that the logic control circuit produces an enable signal and triggers operation processing unit action, and by the logic control
One first group of controlling switch signal caused by circuit and one second group of controlling switch signal feed back to the operation processing unit, by this
Positive offset voltage or negative offset voltage amount correction zero.
2. drive device according to claim 1, it is characterised in that the operation processing unit is further put comprising a computing
Big device, has a positive input terminal, a negative input end and an output end, and the wherein positive input terminal receives the ginseng by a first resistor
Voltage signal is examined, and the one end for the sensing resistance of connecting by a second resistance, the negative input end is then by a 3rd resistor string
Join the other end of the sensing resistance, and the output end is then connected by one the 4th resistance with the negative input end.
3. drive device according to claim 2, it is characterised in that further included inside the operational amplifier：All mold changings
Group, one end are connected with the operational amplifier positive input terminal with the negative input end, to receive the first sensing voltage signal, should
Second sensing voltage signal and reference voltage signal, the other end are then connected with the logic control circuit, with receive those first
Organize controlling switch signal and turn on internal plural groups current-controlled switch, while import corresponding turn of those current-controlled switches
Lead value and a control electric current is obtained after computing, and receive those second group of controlling switch signal, selection starts and those electric current controls
The one first current flowing controlling switch or the second current flowing controlling switch of system switch connection, according to selected first electricity
Flow quantity control switch or the second current flowing controlling switch are flowed, the corresponding control electric current is exported and carries out the positive offset voltage
The correction of amount or the negative offset voltage amount, finally produces an output current；And
One output conversion circuit, be coupled to the switching module, according to the switching module output the output current changed with
Produce the output voltage signal.
4. the drive device according to claim 1 with calibration function, it is characterised in that ground connection load is wireless for one
Charge module.
5. a kind of wireless charging drive system, it is characterised in that by a drive device and a wireless charging with calibration function
Module connection is formed, and the drive device one end is coupled to a power supply unit, and the other end connects with a ground connection load, the ground connection
Load is to be energized and activated by the power supply unit, and wherein the drive device includes：One operation processing unit, have one the
One end, one second end and one the 3rd end, wherein first end and second end is to be born with being series at the power supply unit with the ground connection
A sensing resistance connection between load, a voltage difference signal is obtained through the both ends for detecting the sensing resistance, and obtains one the according to this
One sensing voltage signal and one second sensing voltage signal, and the 3rd end is then connected with a reference voltage signal, through input
Output voltage news are produced after first sensing voltage signal, the second sensing voltage signal and the reference voltage signal computing
Number；And
One offset voltage correction unit, is electrically connected at the operation processing unit, to correct caused by the operation processing unit
One offset voltage amount, wherein the offset voltage correction unit have a power initiation delay circuit, a comparator and a logic control
One negative input end of circuit processed, the wherein comparator is connected with the reference voltage signal, a positive input terminal then with the calculation process
The output voltage signal caused by unit connects to form a feedback circuit, in order to learning that the offset voltage amount belongs to one after comparison
Positive offset voltage or a negative offset voltage amount, and a control signal is exported to the logic control circuit, when the power initiation prolongs
After a rolling counters forward a to time delay set in advance of the slow circuit according to inside, produce a startup signal and give the logic control
Circuit processed, so that the logic control circuit produces an enable signal and triggers operation processing unit action, and by the logic control
One first group of controlling switch signal caused by circuit and one second group of controlling switch signal feed back to the operation processing unit, by this
Positive offset voltage or negative offset voltage amount correction zero.
6. wireless charging drive system according to claim 5, it is characterised in that the wireless charging module includes an output
Control unit and the output induction coil being connected with the output control unit.
7. wireless charging drive system according to claim 5, it is characterised in that the wireless charging module is defeated by this
Go out induction coil and sense an external electronic, and control the external electronic to be charged by the output control unit.
8. wireless charging drive system according to claim 5, it is characterised in that the operation processing unit further includes
One operational amplifier, there is a positive input terminal, a negative input end and an output end, wherein the positive input terminal is by a first resistor
The reference voltage signal is received, and the one end for the sensing resistance of connecting by a second resistance, the negative input end is then by one
The other end of the three resistant series sensing resistance, and the output end is then connected by one the 4th resistance with the negative input end.
9. wireless charging drive system according to claim 8, it is characterised in that further included inside the operational amplifier：
One switching module, one end are connected with the operational amplifier positive input terminal with the negative input end, to receive first sense
Voltage signal and the second sensing voltage signal are surveyed, the other end is then connected with the logic control circuit, to receive those first group
Controlling switch signal and selecting starts one first current flowing controlling switch or the control of the second current flowing inside the switching module
Switch, and receives those second group of controlling switch signal, according to selected the first current flowing controlling switch or this second
Current flowing controlling switch starts connected plural groups current-controlled switch, and corresponding control electric current is produced after conducting
Exported；And
One output conversion circuit, the switching module is coupled to, the control electric current according to switching module output is changed and produced
The raw output voltage signal.
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| CN201410328423.6A CN105305974B (en) | 2014-07-10 | 2014-07-10 | The wireless charging drive system of drive device and its application with calibration function |
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| CN201410328423.6A CN105305974B (en) | 2014-07-10 | 2014-07-10 | The wireless charging drive system of drive device and its application with calibration function |
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| CN106100618B (en) * | 2016-06-06 | 2019-12-17 | 华润微电子（重庆）有限公司 | Voltage offset correction device and method |
| CN112346509B (en) * | 2019-08-07 | 2022-07-12 | 圣邦微电子（北京）股份有限公司 | Calibration circuit for operational amplifier offset voltage in power supply product |
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| CN101119103A (en) * | 2006-08-02 | 2008-02-06 | 盛群半导体股份有限公司 | Device for correcting input offset voltage |
| CN102780461A (en) * | 2006-07-07 | 2012-11-14 | 雅马哈株式会社 | Offset voltage correction circuit and class D amplifier |
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| US7532065B2 (en) * | 2005-07-12 | 2009-05-12 | Agere Systems Inc. | Analog amplifier having DC offset cancellation circuit and method of offset cancellation for analog amplifiers |
| US8253470B2 (en) * | 2010-08-04 | 2012-08-28 | Broadcom Corporation | Offset calibration for amplifiers |
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|---|---|---|---|---|
| CN102780461A (en) * | 2006-07-07 | 2012-11-14 | 雅马哈株式会社 | Offset voltage correction circuit and class D amplifier |
| CN101119103A (en) * | 2006-08-02 | 2008-02-06 | 盛群半导体股份有限公司 | Device for correcting input offset voltage |
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