CN110470901A - Inductive current average value sample circuit in a kind of switching power circuit - Google Patents
Inductive current average value sample circuit in a kind of switching power circuit Download PDFInfo
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- CN110470901A CN110470901A CN201910870707.0A CN201910870707A CN110470901A CN 110470901 A CN110470901 A CN 110470901A CN 201910870707 A CN201910870707 A CN 201910870707A CN 110470901 A CN110470901 A CN 110470901A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The application provides inductive current average value sample circuit in a kind of switching power circuit, and the average value sample circuit includes: sampling clock generation circuit and sampling hold circuit.The input terminal of sampling clock generation circuit is connected with power switch tube Q2, the intermediate value moment of the opening time for obtaining power switch tube Q2, generates triggering command at the intermediate value moment；The output end of sampling clock generation circuit is connected with sampling hold circuit, so that triggering command is transmitted to sampling hold circuit.The intermediate value moment of the opening time of power switch tube Q2 is obtained based on sampling clock generation circuit, sampling hold circuit can be obtained the average value of inductive current in the sampling of intermediate value time instances.With in the prior art utilize continuous sampling obtain the opening time in inductive current, the method for recycling integral calculation average value is compared, average value sample circuit provided by the present application does not need continuous acquisition inductive current, avoids integral calculation bring error, and Stability and veracity is higher.
Description
Technical field
This application involves technical field of semiconductors, and in particular to inductive current average value sampling in a kind of switching power circuit
Circuit.
Background technique
Switching Power Supply is a kind of high frequency device for converting electric energy, for by the voltage of a level, through different structure
Circuit conversion is voltage or electric current needed for user terminal.Switching Power Supply is widely used in power electronics, military project, scientific research, communication are set
The technical fields such as standby, instrument and meter and switching equipment.
Fig. 1 shows a kind of DC-DC switching power circuit, including power switch tube Q1, Q2, inductance L and capacitor C, power
Switching tube Q1 and Q2 are connected in series, and the output end ground connection of power switch tube Q1, inductance L and capacitor C are connected in series, and the one of capacitor C
End ground connection.The input terminal of inductance L is connected with the output end of power switch tube Q2, and power switch tube Q1 and Q2 each cycle is according to one
Fixed duty ratio conducting generates the lesser output voltage of ripple at the both ends of capacitor C so that generating square-wave voltage at node SW
Vout adjusts the voltage value of output voltage Vout by adjusting the size of duty ratio.In one cycle, first Q2 is connected,
Electric current flows into inductance L from VIN, then stops conducting power switch pipe Q2, and the electric energy stored in inductance L is continuous to power switch tube Q1
Stream, electric current flow into inductance L from GND, in the process, inductive current I are formed in inductance LL, inductive current ILFor triangular wave
Current signal.In Q2 conducting phase, inductive current ILFor the rising edge in triangular wave, the corresponding inductive current of rising edge is calculated as
Iin.Square-wave voltage, the inductive current I generated at node SWLThe corresponding inductive current Iin of the triangular wave and rising edge of formation
Waveform diagram it is as shown in Figure 2.
In DC-DC switching power circuit, output electric current Iout is inductive current ILRising edge in the triangular wave of formation
Average value, the output electric current Iout is equal with the inductive current average value at node SW.In order to obtain output electric current
(Iout), it usually needs the average value of inductive current at calculate node SW.Existing inductive current average value sample circuit such as Fig. 3 institute
Show, transient current when being connected using sample circuit (Integrator) continuous collecting power switch tube Q2, then to this transient state
Electric current is integrated, and the average value (Isns) of inductive current is obtained.But due to the nonideal characteristic of switch, sampling error meeting
It is larger, simultaneously because integral calculation itself there are error, causes to calculate resulting inductive current average value with this method
Error is larger.
Summary of the invention
The application provides inductive current average value sample circuit in a kind of switching power circuit, to solve existing inductive current
The larger problem of average sample method error.
The application provides inductive current average value sample circuit in a kind of switching power circuit, the average value sample circuit
Applied to switching power circuit, in the switching power circuit, it is arranged between the output end and node SW of power switch tube Q2
There is current sampling circuit, the current sampling circuit is used to acquire the inductive current in the switching power circuit, described average
Value sample circuit includes:
Sampling clock generation circuit is connected with the power switch tube Q2, for obtaining the power switch tube Q2's
The intermediate value moment of opening time generates triggering command at the intermediate value moment；
Sampling hold circuit is connected with the current sampling circuit, for obtaining the sampling clock generation circuit
Triggering command when, acquire the average value of inductive current.
Optionally, the triggering command includes first triggering command and the second triggering command；
The sampling clock generation circuit is used to obtain the intermediate value moment of the opening time of the power switch tube Q2, by institute
The intermediate value moment is stated as acquisition end time, using any one moment before the intermediate value moment as acquisition initial time；
In the acquisition initial time to the acquisition end time corresponding period, the sampling clock generation circuit is for producing
Raw first triggering command；
The sampling clock generation circuit is also used to using any one moment after the intermediate value moment as triggering
Begin the moment, using any one moment after the triggering initial time as triggering end time；In triggering starting
It carves to the triggering end time corresponding period, the sampling clock generation circuit is for generating the second triggering command.
Optionally, the sampling hold circuit includes level-one sampling hold circuit and second level sampling hold circuit；
The level-one sampling hold circuit is for obtaining the first triggering command, in the acquisition initial time described in
It acquires in the end time corresponding period, acquires the inductive current in the current sampling circuit, obtain target inductance electric current
Signal；
The second level sampling hold circuit is for obtaining the second triggering command, in the triggering initial time to the triggering
In the end time corresponding period, the target inductance current signal is acquired, the average value of inductive current is obtained.
Optionally, the difference of the acquisition initial time and the initial time of the opening time is less than the opening time
1/2；
The difference of the triggering end time and the end time of the opening time is less than the 1/2 of the opening time.
Optionally, the sampling clock generation circuit includes: harmonic signal input circuit, comparator and trigger；
The harmonic signal input circuit includes the current source and charging capacitor being connected in series, one end of the charging capacitor
Ground connection；
One input terminal of the comparator is connected between the current source and the charging capacitor, to obtain harmonic wave
Signal, another input terminal of the comparator are used for the harmonic signal for providing reference voltage, the comparator
With the reference voltage, the power switch tube Q2 is closed in the harmonic signal and the equal reference voltage, by power
Opening time of time of the switching tube Q2 from opening closing as power switch tube Q2；
The trigger is used to carry out two divided-frequency to the harmonic signal, in the opening time for obtaining power switch tube Q2
It is worth the moment.
Optionally, it is provided with driving circuit between the sampling clock generation circuit and the power switch tube Q2, it is described
Driving circuit is used to drive the opening and closing of the power switch tube Q2.
From the above technical scheme, the application provides inductive current average value sampling electricity in a kind of switching power circuit
Road, the average value sample circuit include: sampling clock generation circuit, are connected with the power switch tube Q2, for obtaining
The intermediate value moment of the opening time of the power switch tube Q2 generates triggering command at the intermediate value moment；Sampling hold circuit,
It is connected with the current sampling circuit, for acquiring inductance when obtaining the triggering command of the sampling clock generation circuit
The average value of electric current.The intermediate value moment of the opening time of power switch tube Q2 is obtained based on sampling clock generation circuit, sampling is protected
Holding circuit can be obtained the average value of inductive current in the sampling of intermediate value time instances.With in the prior art utilize continuous sampling obtain
Inductive current in opening time, the method for recycling integral calculation average value are compared, average value sample circuit provided by the present application
Continuous acquisition inductive current is not needed, integral calculation bring error is avoided, Stability and veracity is higher.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of DC-DC switching power circuit structure chart that the prior art provides；
Fig. 2 is the corresponding waveform diagram of Fig. 1；
Fig. 3 is the inductive current average value sample circuit that the prior art provides；
Inductive current average value sample circuit in a kind of switching power circuit that Fig. 4 provides for the application first embodiment；
Fig. 5 is the inductive current average value sample waveform figure that the application first embodiment provides；
Fig. 6 is another inductive current average value sample circuit that the application second embodiment provides；
Fig. 7 is the inductive current average value sample waveform figure that the application second embodiment provides；
Fig. 8 is the connection schematic diagram of sampling clock generation circuit and switching power circuit provided by the embodiments of the present application；
Fig. 9 is the waveform diagram before dividing；
Waveform diagram after Figure 10 frequency dividing.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Inductive current average value sample circuit in a kind of switching power circuit that Fig. 4 provides for the application first embodiment.
The average value sample circuit is applied to switching power circuit, and switching power circuit described herein is related to opening for various topologys
Powered-down source circuit, including but not limited to: DC buck (Buck), DC boosting type (Boost) and buck-boost type (Buck-
Boost) etc..The embodiment of the present application illustrates how to obtain electricity in the switching power circuit by taking DC buck (Buck) as an example
The average value of inducing current.
In switching power circuit provided by the embodiments of the present application, it is connected between power switch tube Q1 and power switch tube Q2
Inductance L and capacitor C, using the tie point between inductance L and power switch tube Q2 as node SW, the output end of power switch tube Q2
Current sampling circuit 30 is provided between node SW, the current sampling circuit 30 is for acquiring in the switching power circuit
Inductive current.
As shown in figure 4, the application provides inductive current average value sample circuit in a kind of switching power circuit, it is described average
Value sample circuit includes: sampling clock generation circuit 10 (sample_CLK) and sampling hold circuit 20 (sample&hold).
The input terminal of sampling clock generation circuit 10 is connected with the power switch tube Q2, opens for obtaining the power
The intermediate value moment for closing the opening time of pipe Q2 generates triggering command at the intermediate value moment；Sampling clock generation circuit 10 it is defeated
Outlet is connected with sampling hold circuit 20, so that the triggering command is transmitted to sampling hold circuit 20.
Sampling hold circuit 20, which has, acquires certain flashy analog input signal, and keeps the function of its value.The application
In embodiment, the inductive current of the acquisition of analog input signal, that is, current sampling circuit 30.Sampling hold circuit 20 have sampling and
Keep two states, under sample states, analog input signal described in the output tracking of sampling hold circuit 20；In hold mode
Under, the output of sampling hold circuit 20 keeps the instantaneous analog input signal of sampling finish time, samples next time until entering
Until state.
In the embodiment of the present application, the input terminal of sampling hold circuit 20 is connected with the current sampling circuit 30, is adopting
Under sample state, sampling hold circuit 20 can continue trace simulation input signal, i.e. inductive current in switching power circuit.
Inductive current I shown according to fig. 2LWaveform diagram, it can be seen that line is presented in inductive current in one cycle
Property variation, which corresponds to the opening time of power switch tube Q2, and average value, that is, rising edge average value of inductive current is based on
Linear change, the average value of rising edge are intermediate value moment corresponding inductive current.Based on this, sampling clock generation circuit is utilized
10 obtain the intermediate value moment of the opening time of power switch tube Q2.Since sampling hold circuit 20 and current sampling circuit 30 have
There is the function of instantaneous sampling, therefore in average value sample circuit provided by the embodiments of the present application, control sampling hold circuit 20 exists
The intermediate value time instances sampling, can be obtained the average value of inductive current.In the embodiment of the present application, sampling clock generation circuit
10 generate triggering command at the intermediate value moment, and sampling hold circuit 20 is in the triggering command for obtaining the sampling clock generation circuit
When, acquire the average value of inductive current.
From the above technical scheme, average value sample circuit provided by the present application, is obtained based on sampling clock generation circuit
The intermediate value moment of the opening time of power switch tube Q2 is obtained, sampling hold circuit can be obtained inductance in the sampling of intermediate value time instances
The average value of electric current.Inductive current in the opening time is obtained with continuous sampling is utilized in the prior art, recycling integral calculation is flat
The method of mean value is compared, and average value sample circuit provided by the present application does not need continuous acquisition inductive current, avoids integrating meter
Bring error is calculated, Stability and veracity is higher.
Due to the time-lag action of sampling clock generation circuit, the average value sample circuit that the application first embodiment provides exists
The intermediate value moment inductive current of acquisition actually corresponds to the inductive current in tiny time section, inductive current shown in Figure 5
Average value sample waveform figure.As shown in figure 5, sampling clock generation circuit generates sampled signal (Sample) within the opening time,
The sampled signal generates a pulse at the intermediate value moment, which answers a triggering command, and sampling hold circuit is from pulse
Rising edge starts to acquire inductive current, until failing edge acquisition terminates.In the process, if in corresponding at the time of acquisition terminates
It is worth the moment, then corresponding inductive current is as inductive current average value at the time of end the acquisition in Isns waveform diagram.
In order to improve the sampling precision of inductive current average value, so that the direct outputting inductance electric current of sampling hold circuit is average
Value calculates the operation such as analysis without carrying out to inductive current, and the application second embodiment provides another average value sampling
Circuit, structural schematic diagram shown in Figure 6.As shown in fig. 6, dividing sampling hold circuit 20 for level-one sampling hold circuit 21
With second level sampling hold circuit 22, wherein the input terminal of level-one sampling hold circuit 21 and the output end of current sampling circuit 30
Connection, for acquiring current sampling circuit inductive current obtained；The input terminal of second level sampling hold circuit 22 is adopted with level-one
The output end of sample holding circuit 21 connects, for acquiring the inductive current obtained of level-one sampling hold circuit 21.
Based on two-stage sampling hold circuit, the application second embodiment still uses a sampling clock generation circuit to adopting
Sample holding circuit is triggered.Correspondingly, sampling clock generation circuit generate intermediate value moment corresponding first triggering command it
Afterwards, delay a period of time, then the second triggering command is generated, first triggering command and the second triggering command are referred to as triggering command.
Fig. 7 show the inductive current average value (Isns1 and Isns2) of the application second embodiment offer, and, sampling
The sampled signal (Sample1 and Sample2) that clock generation circuit generates.
The sampling clock generation circuit is used to obtain the intermediate value moment of the opening time of the power switch tube Q2, by institute
The intermediate value moment is stated as acquisition end time, using any one moment before the intermediate value moment as acquisition initial time；
In the acquisition initial time to the acquisition end time corresponding period, the sampling clock generation circuit is for producing
Give birth to first triggering command, i.e., the pulse in Sample1 shown in fig. 7.
The rising edge and failing edge of pulse respectively correspond acquisition initial time and acquisition end time in Sample1；Institute
It states in acquisition initial time to the acquisition end time corresponding period, the level-one sampling hold circuit is for obtaining institute
First triggering command is stated, the inductive current in the current sampling circuit is acquired, is obtained target inductance current signal (Isns1).
The inductive current acquired in pulse period it can be seen from the waveform diagram of Isns1 is a part of the rising edge of triangular wave, is adopted
The inductive current of sample end time is the average value of inductive current.It is adopted since sampling hold circuit is able to maintain that in the holding stage
The instantaneous analog input signal of sample end time, therefore after sampling end time, the inductive current of Isns1 maintains always
The average value of inductive current.
In order to obtain the average value of inductive current, the sampling clock generation circuit is also used to will be after the intermediate value moment
Any one moment as triggering initial time, any one moment after the triggering initial time is whole as triggering
The only moment；In the triggering initial time to the triggering end time corresponding period, the sampling clock generates electricity
Pulse of the road for generating the second triggering command, i.e., in Sample2 shown in fig. 7.
The rising edge and failing edge of pulse respectively correspond triggering initial time and triggering end time in Sample2；Institute
It states in the triggering initial time period corresponding with triggering end time, the second level sampling hold circuit is for obtaining the second touching
Send instructions, acquire the target inductance current signal, obtains the average value (Isns2) of inductive current.Since Isns1 is whole in acquisition
Only the inductive current after the moment is certain value, therefore within the pulse of the Sample2 corresponding period, Isns2 is collected
Inductive current is similarly certain value, which is the average value of inductive current.
In the application second embodiment, time of initial time to triggering initial time will be acquired as delay time,
The delay time is usually less than the 1/2 of the opening time of power switch tube Q2, to guarantee that triggering initial time is still opened described
It opens in the time.
Optionally, the difference of the acquisition initial time and the initial time of the opening time is less than the opening time
1/2；The difference of the triggering end time and the end time of the opening time is less than the 1/2 of the opening time.
From the above technical scheme, in the average value sample circuit that the application second embodiment provides, it is contemplated that sampling
Holding circuit inductive current collected corresponds to the inductive current in tiny time section, and sampling hold circuit is divided into level-one sampling
Holding circuit and second level sampling hold circuit generate first triggering command and the second triggering command by sampling clock generation circuit,
Level-one sampling hold circuit is used under the triggering of first triggering command, acquires target inductance electric current；Second level sampling hold circuit
For acquiring the average value of inductive current under the triggering of the second triggering command.Above scheme can increase the accuracy of sampling,
So that the average value of the direct outputting inductance electric current of sampling hold circuit.
Fig. 8 show the connection signal of sampling clock generation circuit and switching power circuit provided by the embodiments of the present application
Figure.Driving circuit, sampling clock generation circuit are provided between the sampling clock generation circuit and the power switch tube Q2
Output end be connected with the driving circuit of power switch tube Q2, sampling clock generation circuit export Q2 opening time (Q2_
On), so as to opening and closing that the driving circuit of Q2 drives the power switch tube Q2.The opening time of power switch tube Q1 by
Control loop control, the control loop are arranged between node SW and the input terminal of power switch tube Q1, control loop and power
Driving circuit, the opening time of control loop output power switching tube Q1, so as to the driving electricity of Q1 are provided between switching tube Q1
Road controls the opening and closing of power switch tube Q1, to generate stable output electric current and voltage.
Wherein, the sampling clock generation circuit 10 includes: harmonic signal input circuit 11, comparator 12 and trigger
13。
The harmonic signal input circuit 11 includes the current source 111 and charging capacitor 112 being connected in series, the charging electricity
Hold 112 one end ground connection.Charging capacitor 112 is controlled by switch Dis_ch, and when switch Dis_ch is disconnected, current source 111 is given
Charging capacitor 112 charges；When switch Dis_ch closure, charging capacitor 112 stops charging.
One input terminal of the comparator 12 is connected between the current source and the charging capacitor, in switch Dis_
In the state that ch is disconnected, an input terminal of comparator obtains harmonic signal ramp, opens power switch tube Q2, the harmonic wave at this time
The extension of signal ramp at any time is continuously increased.Another input terminal due to comparator is for providing reference voltage vref, In
During ramp is continuously increased, comparator continues harmonic signal ramp described in comparison and the reference voltage vref, described
Charging capacitor 112 stops charging when the harmonic signal ramp and reference voltage vref equal, closes the power switch at this time
Pipe Q2, the time using power switch tube Q2 from opening closing is as the opening time of power switch tube Q2.
Based on the sampling clock generation circuit that harmonic signal input circuit 11 and comparator 12 form, in switching power circuit
The power switch tube Q2 interior opening and closing of section at a fixed time, that is, form COT (constant on time, when fixing unlatching
Between) circuit of structure.In this circuit arrangement, the opening time Ton of power switch tube Q2 immobilizes.It is humorous within the opening time
Wave signal ramp constantly rises, and the rising edge of harmonic signal ramp is corresponding with the opening time, waveform signal shown in Figure 9
Figure.
As shown in figure 8, trigger is added after comparator 12 in order to obtain intermediate value moment of opening time in the application
13, the trigger 13 is used to carry out two divided-frequency to the harmonic signal, thus obtain the opening time of power switch tube Q2
The intermediate value moment.Waveform diagram shown in Figure 10, after trigger 13 is added, the upper raising speed of the rising edge of harmonic signal ramp
Degree is increased to original twice, and within the same opening time, harmonic signal ramp reaches equal with reference voltage vref twice
Value, wherein as intermediate value at the time of harmonic signal ramp reaches corresponding to reference voltage vref for the first time in one cycle
Moment.
In the embodiment of the present application, two divided-frequency is carried out to harmonic signal ramp using trigger, so that sampling clock generates electricity
Road works twice in one cycle, and to obtain the intermediate value moment of the opening time of power switch tube Q2, the intermediate value moment will be opened
Time Ton point is T1 and T2, wherein T1=T2.
Average value sample circuit provided by the embodiments of the present application is based on the intermediate value moment, establishes two-stage sampling hold circuit, from
And obtain the average value of inductive current.Compared with prior art, the embodiment of the present application does not need continuous sampling, recycles integrating meter
Average value is calculated, the error generated due to integral is avoided, to improve the sampling precision of inductive current average value.
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously
It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope,
A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application
In the range of.The protection scope of the application is determined by the appended claims.
Claims (6)
1. inductive current average value sample circuit in a kind of switching power circuit, the average value sample circuit is applied to switch electricity
Source circuit is provided with current sample electricity in the switching power circuit between the output end and node SW of power switch tube Q2
Road, the current sampling circuit are used to acquire the inductive current in the switching power circuit, which is characterized in that the average value
Sample circuit includes:
Sampling clock generation circuit is connected with the power switch tube Q2, for obtaining the unlatching of the power switch tube Q2
The intermediate value moment of time generates triggering command at the intermediate value moment；
Sampling hold circuit is connected with the current sampling circuit, in the touching for obtaining the sampling clock generation circuit
When sending instructions, the average value of inductive current is acquired.
2. average value sample circuit according to claim 1, which is characterized in that the triggering command includes that the first triggering refers to
It enables and the second triggering command；
The sampling clock generation circuit is used to obtain the intermediate value moment of the opening time of the power switch tube Q2, in described
It is worth the moment as acquisition end time, using any one moment before the intermediate value moment as acquisition initial time；Institute
It states in acquisition initial time to the acquisition end time corresponding period, the sampling clock generation circuit is for generation the
One triggering command；
The sampling clock generation circuit is also used to using any one moment after the intermediate value moment as when triggering starting
It carves, using any one moment after the triggering initial time as triggering end time；The triggering initial time extremely
In the triggering end time corresponding period, the sampling clock generation circuit is for generating the second triggering command.
3. average value sample circuit according to claim 2, which is characterized in that the sampling hold circuit includes that level-one is adopted
Sample holding circuit and second level sampling hold circuit；
The level-one sampling hold circuit is for obtaining the first triggering command, in the acquisition initial time to the acquisition
In the end time corresponding period, the inductive current in the current sampling circuit is acquired, obtains target inductance current signal；
The second level sampling hold circuit is terminated for obtaining the second triggering command in the triggering initial time to the triggering
In the corresponding period at moment, the target inductance current signal is acquired, the average value of inductive current is obtained.
4. average value sample circuit according to claim 2, which is characterized in that the acquisition initial time and the unlatching
The difference of the initial time of time is less than the 1/2 of the opening time；
The difference of the triggering end time and the end time of the opening time is less than the 1/2 of the opening time.
5. average value sample circuit according to claim 1, which is characterized in that the sampling clock generation circuit includes:
Harmonic signal input circuit, comparator and trigger；
The harmonic signal input circuit includes the current source and charging capacitor being connected in series, a termination of the charging capacitor
Ground；
One input terminal of the comparator is connected between the current source and the charging capacitor, to obtain harmonic wave letter
Number, another input terminal of the comparator for providing reference voltage, the comparator for the harmonic signal and
The reference voltage closes the power switch tube Q2 in the harmonic signal and the equal reference voltage, power is opened
Close opening time of time of the pipe Q2 from opening closing as power switch tube Q2；
The trigger is used to carry out two divided-frequency to the harmonic signal, when obtaining the intermediate value of the opening time of power switch tube Q2
It carves.
6. average value sample circuit according to claim 1, which is characterized in that the sampling clock generation circuit with it is described
Driving circuit is provided between power switch tube Q2, the driving circuit is used to drive the opening and closing of the power switch tube Q2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114935681A (en) * | 2022-05-17 | 2022-08-23 | 上海数明半导体有限公司 | Load current detection circuit, step-down converter, and load current detection method |
| WO2023098127A1 (en) * | 2021-11-30 | 2023-06-08 | 东南大学 | Inductive current estimation method of dc-dc switch power supply |
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