CN106033902B - Suitching type charger - Google Patents
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- CN106033902B CN106033902B CN201510121073.0A CN201510121073A CN106033902B CN 106033902 B CN106033902 B CN 106033902B CN 201510121073 A CN201510121073 A CN 201510121073A CN 106033902 B CN106033902 B CN 106033902B
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- responsibility cycle
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Abstract
Suitching type charger is receiving an input voltage and accordingly provide an output voltage.The suitching type charger includes a switching circuit, an inductor, a control circuit and a detection circuit.The switching circuit is coupled to the input voltage；The inductor provides the output voltage to a load to receive the input voltage from the switching circuit；The control circuit is to the output current according to the switching circuit and the feedback signal from the output voltage, to generate a responsibility cycle signal, and controls the switching circuit according to the responsibility cycle signal；The detection circuit advances into a close pattern in advance according to the size of the responsibility cycle signal and the output current of the switching circuit, to carry out the dynamic control switching circuit in what a full pulse width terminated modulation period.
Description
Technical field
The present invention can prevent load end from leakage current (leakage occurs in relation to a kind of suitching type charger, espespecially one kind
Current) the suitching type charger of effect.
Background technology
Traditional charging mobile phone battery mode is typically to be charged using linear charger (linear charger), is charged
The input current of device can be constantly equal to output current, due to power-supply adapter be 5 volts (V) output, and battery of mobile phone voltage be
Between 3V to 4.2V, when the voltage of battery is relatively low, then the problem of will produce power attenuation, namely power supply power just
It can be lost on charger circuit.In addition, above-mentioned power attenuation can also cause fever phenomenon of the device in charging process, and it is difficult
To further increase charging current.
Based on linear charger there is disadvantage mentioned above, suitching type charger (switching charger) to have gradually replaced
Linear charger.For example, when using suitching type charger, if cell voltage is relatively low, it is supplied to the electric current of battery real
Input current can be higher than on border, therefore have lower circuit power loss.However, there are leakages for existing suitching type charger
The problem of electric current.For example, when the voltage of battery is less than 3V, suitching type charger can export low current to carry out battery
Charging；When the voltage of battery is more than 3V, the output current of suitching type charger can become larger, then the meeting of suitching type charger
Into constant current (constant current) pattern；It is saturated shape when the voltage of battery levels off to 4.2V, namely close to charging
When state, suitching type charger can enter constant voltage mode, and the output current of suitching type charger can be plummeted to 0 ampere (A), due to
The switch of the second turn-on cycle of responsibility cycle (duty cycle) is worked in the switching circuit of suitching type charger at this time still
For conducting state, causes load to have negative current through thus switching reflux, cause battery to discharge suitching type charger, this is to leak
Current effect, and this can be such that charge efficiency is greatly reduced.Therefore, in need to provide a kind of new suitching type charger to solve
State problem.
Invention content
One embodiment of the invention provides a kind of suitching type charger, to receive an input voltage, and accordingly
One output voltage is provided.The suitching type charger includes a switching circuit, an inductor, a control circuit and a detection electricity
Road.The switching circuit is coupled to the input voltage；The inductor is coupled to the switching circuit, should to be received from the switching circuit
Input voltage, and the output voltage is provided to a load；The control circuit to according to the output current of the switching circuit and
A feedback signal from the output voltage generating a responsibility cycle signal, and controls this according to the responsibility cycle signal
Switching circuit；The detection circuit is to according to the size of the responsibility cycle signal and the output current of the switching circuit, to move
State controls the switching circuit and advances into a close pattern in advance in what a full pulse width terminated modulation period.
The suitching type charger that the embodiment of the present invention is provided can detect the whether close charging saturation state of load end, with
It selectively executes one and shifts to an earlier date close pattern to prevent the leakage current effects of load end, and then reduce power attenuation and promoted and filled
Electrical efficiency.
Description of the drawings
Fig. 1 is the schematic diagram of an embodiment of suitching type charger of the present invention.
Fig. 2 is to have the oscillogram for executing the responsibility cycle for shifting to an earlier date close pattern according to one embodiment of the invention.
Fig. 3 is the oscillogram for being not carried out the responsibility cycle of close pattern in advance according to one embodiment of the invention.
Symbol description
100 suitching type chargers
20 switching circuits
30 inductors
40 detection circuits
50 control circuits
52 error amplifiers
54 comparators
56 control logic circuits
60 bleeder circuits
VinInput voltage
VOOutput voltage
ROLoad
VFBFeedback signal
DU responsibility cycle signals
ILOutput current
R1, R2 resistance
VREFReference voltage
VCControl signal
VCSSensing voltage
VSSlope compensation
COCapacitance
RCResistor assembly
RLResistor assembly
iCSSense electric current
PreZCD the first scheduled current peak values
PreZCD ' the second scheduled current peak values
Q1 first switches
Q2 second switches
T0~t3 time points
Specific implementation mode
Some vocabulary has been used in specification and scope of the appended claims to censure specific component.Affiliated neck
Those of ordinary skill in domain is, it is to be appreciated that hardware manufacturer may call same component with different nouns.This explanation
Book and scope of the appended claims are not in such a way that the difference of title is used as and distinguishes component, but functionally with component
Difference be used as the criterion of differentiation.It is an opening in the "comprising" of specification in the whole text and the attached claims mentioned in
The term of formula, therefore should be construed to " including but not limited to ".In addition, " coupling " word includes any directly and indirectly electric herein
Gas connection means.Therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can be directly electric
Gas is connected to the second device, or is electrically connected indirectly to the second device by other devices or connection means.
Fig. 1 is the schematic diagram of an embodiment of suitching type charger of the present invention (switching charger).The present embodiment
In, suitching type charger 100 is receiving an input voltage Vin, and an output voltage V is accordingly providedO.Suitching type charges
Device 100 includes a switching circuit 20, an inductor 30, a detection circuit 40, a control circuit 50 and a bleeder circuit 60.
It note that suitching type charger 100 can be used as a decompression (buck) charger, but not limited to this, in addition, the present embodiment
In, the inside of switching circuit 20 and control circuit 50 forms component only to illustrate, not limiting scope of the invention.
Switching circuit 20 is coupled to input voltage Vin；Inductor 30 is coupled to switching circuit 20, receives and inputs to adaptive switched circuit 20
Voltage Vin, and output voltage V is providedOTo a load RO；Control circuit 50 is to according to the output current i of switching circuit 20LAnd
From output voltage VOA feedback signal VFB, to generate responsibility cycle signal DU, and controlled according to responsibility cycle signal DU
The switch conduction sequential of switching circuit 20.Detection circuit 40 is to according to the output of responsibility cycle signal DU and switching circuit 20
Electric current iLSize, come dynamic control switching circuit 20 in a full pulse width modulation (pulse width modulation,
PWM) end cycle advance into one in advance close pattern.Those of ordinary skill can be appreciated that " full pulse width modulation period " wraps
One first turn-on cycle (namely unlatching period of the first switch Q1 in switching circuit 20) and one second turn-on cycle are contained
The unlatching period of second switch Q2 (namely in switching circuit 20).In addition, in the present invention, " close pattern in advance " refers to contracting
The length of second turn-on cycle of short switching circuit 20, namely shorten the unlatching period of second switch Q2 in switching circuit 20, make
Second switch Q2 is obtained just to close ahead of time before full pulse width terminates modulation period.
For example, control circuit 50 can be generated according to responsibility cycle signal DU is used for opening (namely conducting) first switch
The first responsibility cycle signal S of Q1P(i.e. the first turn-on cycle signal) and for opening (namely conducting) second switch Q2's
Second responsibility cycle signal SN(i.e. the second turn-on cycle signal), wherein first switch Q1 have a first end, are coupled to input
Voltage Vin, a control terminal, to receive the first responsibility cycle signal SPAn and second end；Second switch Q2 has one first
End, is coupled to the second end of first switch Q1, a control terminal, to receive the second responsibility cycle signal SN, wherein detection circuit
40 can sense output current i of the switching circuit 20 when first switch Q1 is connectedL(sense electric current iCS), and 40 meeting of detection circuit
Shift to an earlier date close pattern by closing second switch Q2 to allow switching circuit 20 to enter.First switch Q1 and second switch Q2 can examples
Transistor in this way, but not limited to this, as long as substantially the same switching function can be realized, other components can also be used and carry out generation
It replaces.
The turn-on time T of first switch Q1ON(Q1) with the ratio of full pulse width T modulation period (namely)
The responsibility cycle D (Q1) of as first switch Q1, and the turn-on time T of second switch Q2ON(Q2) all with pulse width modulation
Phase T ratio (namely) be second switch Q2 responsibility cycle D (Q2), if in addition, close pattern is not in advance
Start, then the summation of the responsibility cycle and the responsibility cycle of second switch Q2 of D (Q1)+D (Q2)=1 namely first switch Q1 is
Whole (100%) responsibility cycle (namely the unlatchings period of first switch Q1 adds unlatching period of second switch Q2 and can be equal to
The time span of full pulse width T modulation period), if however, close pattern is activated in advance, D (Q1)+D (Q2)<1,
That is the responsibility cycle of first switch Q1 and the summation of the responsibility cycle of second switch Q2 can be less than whole (100%) responsibility cycles
(namely the unlatching period of first switch Q1 can be less than full pulse width T modulation period plus the unlatching period of second switch Q2
Time span).
Bleeder circuit 60 is to according to output voltage VOTo generate feedback voltage VFB, wherein bleeder circuit 60 can utilize icon
Two resistance R1, R2 realize that but invention is not limited thereto.In addition, control circuit 50 includes an error amplifier 52, one
Comparator 54 and a control logic circuit 56.Error amplifier 52 is receiving feedback signal VFB, and by feedback signal VFBWith
One reference voltage VREFIt is compared, to generate a control signal VC.Comparator 54 can be for example to be modulated for a pulse width
(pulse-width modulation, PWM) comparator, to receive control signal VC, corresponding switching circuit 20 output end
A sensing voltage VCSAn and slope compensation VS, and according to control signal VC, sensing voltage VCSAnd slope-compensation
Signal VSTo generate a comparison result using as responsibility cycle signal DU.For example, which can be a square wave, and
Comparator 54 can be to sensing voltage VCSAnd slope compensation VSIt is added up, and the input signal after totalling is believed with control
Number VCIt is compared to export the square wave.Control logic circuit 56 can determine switching circuit according to comparison result (i.e. the square wave)
The responsibility cycle of each switch (i.e. first switch Q1 and second switch Q2) in 20.Due to error amplifier 52, comparator 54
And the operating principle of control logic circuit 56 is well known to those of ordinary skill in the art, therefore more detailed operation is herein just not
Separately repeat.
It (note that in different in the first turn-on cycle of a full pulse width modulation period of switching circuit 20
In pulse width modulation period, the time span of the first turn-on cycle is dynamically adapted), control logic circuit 56 can open switching
First switch Q1 in circuit 20 and second switch Q2 in switching circuit 20 is closed, by energy from input voltage VinVia
Inductor 30 and be sent to capacitance CO.In this case, input voltage VinCan by inductor 30 to load ROElectric current is provided.This
Outside, it (note that wide in different pulses in the second turn-on cycle of the full pulse width modulation period of switching circuit 20
Spend in modulation period, the time span of the second turn-on cycle is also dynamically adapted), control logic circuit 56 can close switching circuit
The second switch Q2 in first switch Q1 and unlatching switching circuit 20 in 20, will be in capacitance COWithin energy be sent to
Load RO, inductor 30 can be by its converse voltage to continue to load ROElectric current is provided.Capacitance COIt is (or low with ground terminal potential
Logic level) between can couple a resistor assembly RC, and inductor 30 and load ROBetween can couple a resistor assembly RL, but this
Invention is not limited.
Please also refer to the 1st~3 figure, wherein Fig. 2 systems are to have execution to close mould in advance according to one embodiment of the invention
The oscillogram of the responsibility cycle of formula, Fig. 3 systems are the responsibility week for being not carried out close pattern in advance according to one embodiment of the invention
The oscillogram of phase.Detection circuit 40 understands the sensing electric current i of the input terminal of detection comparator 54 togetherCSAnd the output of comparator 54
Responsibility cycle signal DU, with according to sensing electric current iCSAnd responsibility cycle signal DU shifts to an earlier date close pattern to decide whether to execute.
Specifically, when responsibility cycle signal DU indicates the operating time of switching circuit 20 a current full pulse width modulation period
In have reached a predetermined point of time, and sensing electric current iCSPeak value (peak current value) be less than one first predetermined electricity
When stream peak value PreZCD, detection circuit 20 can control switching circuit 20 and (can be considered modulation period in current full pulse width
100% responsibility cycle) in predetermined point of time enter shift to an earlier date close pattern, wherein the first scheduled current peak value PreZCD can be set
For 300mA, a threshold value (threshold) can be considered.
For example, in fig. 2, at the beginning of a complete pulse width modulation period point (i.e. t0) to the predetermined time
The time span of point (i.e. t2) can be set as the 90% of full pulse width modulation period, and wherein time point t3 is full pulse width
The end time point of modulation period, what the period between time point t0~t1 represented in full pulse width modulation period first leads
Lead to the period (namely unlatching period of first switch Q1), the period between time point t1~t2 represents full pulse width modulation week
Interim the second turn-on cycle (namely unlatching period of second switch Q2), and PON grasps to marker pulse width modulation period
Make in the first turn-on cycle, NON operates to marker pulse width modulation period in the second turn-on cycle.In figure 3, one is complete
Pulse width modulation period at the beginning of point and end time point be respectively t0 and t3, wherein period of time point t0~t1
Represent the first turn-on cycle (namely unlatching period of first switch Q1) in full pulse width modulation period and time point
Period between t1~t3 represents the second turn-on cycle (namely unlatching of second switch Q2 in full pulse width modulation period
Period).Due to Fig. 2~3 it is found that when close pattern in advance be performed, the second turn-on cycle of pulse width modulation period (
That is the unlatching period of second switch Q2) just can ahead of time it terminate before full pulse width terminates modulation period.
In the present embodiment, detection sensing electric current iCSBy detecting sensing voltage V in practical operationCSIt realizes, because of sense
Survey voltage VCSValue be to sense electric current iCSValue be multiplied by resistor assembly RiResistance value, if resistor assembly RiResistance value be definite value,
Then sensing voltage VCSWith sensing electric current iCSThere can be a fixed proportion, therefore, via sensing voltage VCSStool and urine can learn sense
Survey electric current iCSSize.However, the mechanism of the output current size of any detectable switching circuit 20 may be utilized, these set
Variation on meter belongs to the scope of the present invention.
As shown in the example of figure 2, when detecting sensing electric current iCSPeak value (sensing electric current iCSIn the first turn-on cycle
Maximum value) not big enough (being, for example, less than 300mA), and complete pulse width modulation period has been running for predetermined point of time
When (such as 90% responsibility cycle), the control logic circuit 56 of control circuit 50 can close second switch Q2 immediately, to prevent
Battery-end (loads ROEnd) there is leakage current.In addition, as shown by example in fig. 3, electric current i is sensed when detectingCSPeak value (sensing
Electric current iCSMaximum value in the first turn-on cycle) big (being greater than 300mA) has been reached, no matter complete pulse width at this time
Whether predetermined point of time is had been running for modulation period, and control circuit 50 will not execute the operation of close pattern in advance, Ye Ji
Two turn-on cycles will not terminate ahead of time.The spirit of the present invention is, sensing electric current i is detected using detection circuit 40CSPeak value
Size and responsibility cycle whether have been running for predetermined point of time, therefore it can be seen that load ROWhether (i.e. battery) is in one
Close to the state of charging saturation, because as sensing electric current iCSPeak value be less than the first scheduled current peak value PreZCD (such as
300mA), it is known that the output current i of switching circuit 20LVariation approached mitigation, along with responsibility cycle has been running for
Predetermined point of time (such as 90% responsibility cycle), therefore the saturation it can be seen that battery will charge, therefore control logic circuit 56 can
In leakage current, there may be just first close second switch Q2 before (because leakage current is from load R according to thisOFlow through second switch Q2
To ground terminal), therefore can effectively avoid suitching type charger in the prior art has the problem of leakage current.
It note that in the figure 2 example, when meeting the execution condition of close pattern in advance, it is preferable that second switch
Q2 can be substantially closed in predetermined point of time, namely be closed in time point t2 or later than time point t2, however this hair
It is bright to be not limited thereto, as long as second switch Q2 can be closed before time point t3 can effectively inhibit leakage phenomenon.
In other words, the size of every output current according to suitching type charger and responsibility cycle signal on feedback path shorten
It the time (namely shortening the unlatching period of second switch Q2) of the second turn-on cycle in one pulse width modulation period, comes under
Scope of the invention.
Shift to an earlier date close pattern except through the first scheduled current peak value PreZCD of setting to decide whether to execute, to adjust mesh
The time length of the second turn-on cycle in preceding full pulse width modulation period, the present invention also accordingly provide following anti-
Only the method for improper operation come combine above-mentioned control shift to an earlier date close pattern execution operation, however following methods are not limiting
Determine scope of the invention.
For example, it is operated in close pattern in advance modulation period in the current full pulse width of switching circuit 20
Under premise, detection circuit 40 can be different from the first scheduled current peak value to setting next full pulse width modulation period
The one second scheduled current peak value PreZCD ' of PreZCD, such as the second scheduled current peak value PreZCD ' can be set as 330mA, and
One scheduled current peak value PreZCD is 300mA.That is, if switching circuit 20 is first full pulse width modulation period
Have into shifting to an earlier date close pattern, in second full pulse width modulation period of (namely immediately first full pulse width tune
Another full pulse width modulation period after period processed) current peak must be over higher threshold value, just will not be again
Into close pattern in advance.If being closed in advance in addition, switching circuit 20 does not enter in second full pulse width modulation period
Close pattern, then detection circuit 40 can be by (namely immediately second full pulse width third full pulse width modulation period
Another full pulse width modulation period after modulation period) threshold value be set as 300mA again, and so on.
Thus, can avoid the operation mode of switching circuit 20 because of input current iLA little peak value concussion without
It is disconnected to change.Because making detection when switching circuit 20 enters close pattern in advance in current full pulse width modulation period
Scheduled current peak value employed in next full pulse width modulation period is increased to 330mA by circuit 40, if switching electricity
The output current i on road 20LIt is maintained at less than 330mA (even if output current i in next full pulse width modulation periodLHave
More than 300mA), and the operating time of responsibility cycle signal DU instruction switching circuits 20 is in next full pulse width modulation week
Interim to have reached predetermined point of time (such as 90% responsibility cycle), it is next in this that detection circuit 40 will control switching circuit 20
Predetermined point of time (such as 90% responsibility cycle) in full pulse width modulation period, which enters, shifts to an earlier date close pattern.Detection electricity
Road 40 will persistently use the second scheduled current peak value PreZCD ' (such as 330mA), be modulated until in a certain full pulse width
In period, the output current i of switching circuit 20LMore than 330mA, and when the operation of responsibility cycle signal DU instruction switching circuits 20
Between predetermined point of time (such as 90% responsibility cycle), detection circuit 40 are had reached in this full pulse width modulation period
Predetermined point of time (such as 90% responsibility week of the switching circuit 20 in this full pulse width modulation period will not then be controlled
Phase) enter and shifts to an earlier date close pattern, and by institute's scheduled current peak value weight to be used in next full pulse width modulation period
Newly it is set as the first scheduled current peak value PreZCD (such as 300mA).
In conclusion the suitching type charger of the present invention can detect load end whether close to charging saturation state, with selection
Property execute one in advance close pattern prevent the leakage current effects of load end, to reduce power attenuation and promote charging effect
Energy.
The foregoing is merely presently preferred embodiments of the present invention, all changes of equal value done according to the present patent application right
Change and modify, should all belong to the covering scope of the present invention.
Claims (10)
1. a kind of suitching type charger, to receive an input voltage, and
An output voltage is accordingly provided, which includes：
One switching circuit is coupled to the input voltage；
One inductor is coupled to the switching circuit, to receive the input voltage from the switching circuit, and provides the output voltage
To a load；
One control circuit is come to the output current according to the switching circuit and the feedback signal from the output voltage
Generate a responsibility cycle signal, wherein the responsibility cycle signal is square-wave signal, and controls this according to the responsibility cycle signal
Switching circuit；And
One detection circuit, to according to the size of the responsibility cycle signal and the output current of the switching circuit, dynamically to control
It makes the switching circuit and advances into a close pattern in advance in what a full pulse width terminated modulation period.
2. suitching type charger as described in claim 1, wherein when the operation of the responsibility cycle signal designation switching circuit
Time has reached a predetermined point of time and the output current of the switching circuit in a current full pulse width modulation period
Peak value be less than one first scheduled current peak value when, which controls the switching circuit in the current full pulse width tune
Predetermined point of time entrance in period processed should shift to an earlier date close pattern.
3. suitching type charger as claimed in claim 2, wherein at the beginning of the current full pulse width modulation period
The time span of point to the predetermined point of time is the 90% of full pulse width modulation period.
4. suitching type charger as claimed in claim 2, wherein the first scheduled current peak value are 300mA.
5. suitching type charger as claimed in claim 2, wherein in the switching circuit into after should shift to an earlier date close pattern, the inspection
Whether the peak value that slowdown monitoring circuit detects the output current of the switching circuit in next full pulse width modulation period is different from being somebody's turn to do
One second scheduled current peak value of the first scheduled current peak value.
6. suitching type charger as claimed in claim 5, wherein the second scheduled current peak value are more than first scheduled current
Peak value.
7. suitching type charger as claimed in claim 6, wherein the second scheduled current peak value are 330mA.
8. suitching type charger as claimed in claim 5, wherein when the operation of the responsibility cycle signal designation switching circuit
Time has reached a predetermined point of time and the output current of the switching circuit in next full pulse width modulation period
Peak value be less than the second scheduled current peak value when, which controls the switching circuit in next full pulse width tune
Predetermined point of time entrance in period processed should shift to an earlier date close pattern.
9. suitching type charger as described in claim 1, the wherein control circuit generate one the according to the responsibility cycle signal
One responsibility cycle signal and one second responsibility cycle signal and the switching circuit include：
One first switch has a first end, is coupled to the input voltage, a control terminal, to receive first responsibility cycle
Signal and a second end；And
One second switch has a first end, is coupled to the second end of the first switch, a control terminal, to receive this second
Responsibility cycle signal；
The output current for the switching circuit that wherein detection circuit is sensed is the switching circuit when first switch is connected
Output current and the detection circuit close the second switch allow the switching circuit into should in advance close pattern.
10. suitching type charger as described in claim 1 is a buck converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510121073.0A CN106033902B (en) | 2015-03-19 | 2015-03-19 | Suitching type charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510121073.0A CN106033902B (en) | 2015-03-19 | 2015-03-19 | Suitching type charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106033902A CN106033902A (en) | 2016-10-19 |
| CN106033902B true CN106033902B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510121073.0A Active CN106033902B (en) | 2015-03-19 | 2015-03-19 | Suitching type charger |
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| Country | Link |
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| CN (1) | CN106033902B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602160B (en) * | 2016-12-22 | 2019-06-04 | 惠州Tcl移动通信有限公司 | A kind of method and system improving charging current handoff response |
| TWI620391B (en) * | 2016-12-23 | 2018-04-01 | 茂達電子股份有限公司 | Switching charging circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039070A (en) * | 2006-03-15 | 2007-09-19 | 麦奎尔有限公司 | Switching voltage regulator with low current trickle mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0200030D0 (en) * | 2002-01-02 | 2002-02-13 | Bae Systems Plc | A switching circuit and a method of operation thereof |
| US9362843B2 (en) * | 2012-08-13 | 2016-06-07 | Fairchild Korea Semiconductor Ltd | Switch control device, power supply device comprising the same, and driving method of power supply device utilizing turn-on period half-on time point detection |
| US9722490B2 (en) * | 2013-09-05 | 2017-08-01 | Intersil Americas LLC | Smooth transition of a power supply from a first mode, such as a pulse-frequency-modulation (PFM) mode, to a second mode, such as a pulse-width-modulation (PWM) mode |
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2015
- 2015-03-19 CN CN201510121073.0A patent/CN106033902B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039070A (en) * | 2006-03-15 | 2007-09-19 | 麦奎尔有限公司 | Switching voltage regulator with low current trickle mode |
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