CN209134299U - Switch power converter and its load current detection circuit - Google Patents
Switch power converter and its load current detection circuit Download PDFInfo
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- CN209134299U CN209134299U CN201821556842.5U CN201821556842U CN209134299U CN 209134299 U CN209134299 U CN 209134299U CN 201821556842 U CN201821556842 U CN 201821556842U CN 209134299 U CN209134299 U CN 209134299U
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Abstract
Switch power converter and its load current detection circuit, including switching tube peak point current sample circuit, sampling hold circuit, inductive current compensation circuit and the low-pass filter circuit for obtaining Boost type or Buck-Boost type switch power converter switching tube peak-current signal；Sampling hold circuit obtains switching tube peak-current signal from switching tube peak point current sample circuit；During the continued flow tube conducting of switch power converter, switch tube peak-current signal carries out current compensation, obtains compensated inductor current signal；Low-pass filter circuit and sampling hold circuit electrical connection, output is used as load current signal after carrying out low-pass filtering to compensated inductor current signal.Circuit is simplified, the accuracy and reliability of detection is improved, is reduced costs and power consumption.
Description
Technical field
The utility model relates to the technical fields of switch power converter circuit, and in particular to a kind of switch power converter
Load current detection method and circuit improve load current detection while reducing load current detection circuit complexity
Accuracy.
Background technique
Switch power converter circuit is one of most important type in power supply voltage converter, is primarily adapted for use in voltage change
The situation changed, the circuit form of DC/DC switch power converter include the charge pump circuit realized with capacitor, also include using inductance
Voltage-dropping type Buck switching circuit, booster type Boost circuit and the negative electricity volt circuit Buck-Boost circuit of realization.In order to switch
Electric current is accurately controlled in converter circuitry of power, needs accurately to detect load current.
In the prior art, common load current detection method first is that technical solution as shown in Fig. 2, in switch electricity
Connect an external inspection leakage resistance Rsen on the current path of source converter chip exterior inductance, and the electric current of inductance flows through inspection galvanic electricity
Resistance Rsen can generate pressure drop, return to the operational amplifier in chip by two pins on chip, pass through operational amplifier
Voltage realizes load current detection on amplification inspection leakage resistance.In the scheme of external inspection leakage resistance, operational amplifier needs the moment
The voltage at detection resistance both ends requires the speed and precision of operational amplifier high；And the circuit of this structure is needed in ring
A load detecting resistance Rsen is connected in road to inductance, in each switch periods, load detecting resistance Rsen flows through electric current
It can cause the loss in efficiency of switch power converter；Due to the power loss fever outside piece on load detecting resistance Rsen, load
The resistance value of detection resistance Rsen can change, and not only efficiency is lost, and can also reduce the accuracy of detection, and high-precision inspection
Leakage resistance is more expensive；Furthermore, it is necessary to which two pins are arranged on chip gives inspection leakage resistance, therefore the complexity of chip increases, collection
Decline at degree, the cost increase of system.In Boost type and Buck-Boost type switch power converter circuit, due to load
Electric current is discrete, therefore it is required that the response of operational amplifier is fast and precision is high, is detected using common operational amplifier
Load current error is big.
In prior art, some switch power converter chips need external continued flow tube design, and such scheme is not
It can be using load current sampling in chip.
It is all logical according to load current sampling technique in chip in the switch power converter chip of the prior art
Over-sampling afterflow tube current detects the purpose of output load current to realize.This method exports electricity in Boost, Buck-Boost
When pressure and input voltage gap are bigger, implement more complicated, power consumption is also bigger.In addition opening in the prior art
It in powered-down source converter chip, and needs to make inductive current peak limitation, so the sampling of switch tube current must can not
It is few, if in addition detecting load current, need to sample afterflow tube current, equivalent to increase circuit kit.
Explanation of nouns:
The meaning of Buck type switch power converter in this application is the decompression DC/ using Buck REGULATOR mode
DC transformation system；Its input voltage is greater than output voltage；
The meaning of Boost type switch power converter in this application is the boosting using Boost REGULATOR mode
DC/DC transformation system；Its output voltage is greater than input voltage；
The meaning of Buck-Boost type switch power converter in this application is using Buck-Boost REGULATOR
The negative pressure DC/DC transformation system of mode；
PWM is the abbreviation of English Pulse Width Modulation, and Chinese meaning is pulse width modulation；Pulsewidth width
Modulation system (PWM) switch power converter be in the case where control circuit output frequency is constant, by adjusting its duty ratio, from
And achieve the purpose that stabilize the output voltage；
CCM is the abbreviation of English Continuous Conduction Mode, and Chinese meaning is continuous conduction mode, is referred to
Power tube is alternately to be continuously turned on that the electric current in inductance is made to be the operating mode of consecutive variations in Boost circuit；
DCM: being the abbreviation of English Discontinuous Conduction Mode, and Chinese meaning is discontinuous conduction mode,
Refer to that power tube is alternately to close one of them in Boost circuit, making the electric current in inductance is the work of non-consecutive variations
Operation mode.
Utility model content
The technical problem to be solved by the present invention is to avoid the deficiency of above-mentioned prior art, and propose one kind
Suitable for carrying out the switch power converter load current detection side of load current sampling in switch power converter chip interior
Method and circuit reduce the complexity of load current detection circuit, also improve the accuracy of load current detection.
It is the inspection of switch power converter load current that the utility model, which solves technical solution used by the technical problem,
Slowdown monitoring circuit, including for obtaining opening for Boost type or Buck-Boost type switch power converter switching tube peak-current signal
Close pipe peak point current sample circuit, for switching tube peak point current sampled signal keep sampling hold circuit, be used for switching tube
The inductive current compensation circuit and low-pass filter circuit of peak point current sampled signal compensation；Switching tube peak point current sample circuit and
Sampling hold circuit electrical connection, sampling hold circuit obtain switching tube peak point current letter from switching tube peak point current sample circuit
Number；Inductive current compensation circuit and sampling hold circuit electrical connection, it is split during the continued flow tube conducting of switch power converter
It closes pipe peak-current signal and carries out current compensation, obtain compensated inductor current signal；Low-pass filter circuit and sampling are kept
Circuit electrical connection, compensated inductor current signal is exported after low-pass filtering and is used as load current signal.
The sampling hold circuit includes first switch, sampling capacitance and sampled operational amplifier；One end of first switch
It is electrically connected with switching tube peak point current sample circuit, the other end of first switch and one end of sampling capacitance and sampled operational are put
The positive input electrical connection of big device；The other end of sampling capacitance is grounded；The negative input of sampled operational amplifier and sampling
The output end of operational amplifier is electrically connected；One end and sampled operational amplifier of inductive current compensation circuit and sampling capacitance
Positive input electrical connection；First switch is controlled by the second control signal obtained from switch power converter；Second control letter
When number being high level, first switch closure is electrically connected sampling hold circuit and switching tube peak point current sample circuit；Second
When control signal is low level, first switch is opened, and is made between sampling hold circuit and switching tube peak point current sample circuit
It disconnects.
Third switch is provided between inductive current compensation circuit and sampling hold circuit；Third switch is controlled by from switch
The first control signal that power adapter obtains；When first control signal is high level, third is closed the switch, and keeps sampling
Circuit and the electrical connection of inductive current compensation circuit；When first control signal DRN is low level, third switch is opened, and makes to sample
It is disconnected between holding circuit and inductive current compensation circuit；Or the third switch is diode, passes through the diode two
Connection is connected or disconnected between the voltage signal control sampling hold circuit and inductive current compensation circuit at end.
The inductive current compensation circuit is current source.
Decline period, that is, continued flow tube in inductive current and period, the compensation electric current that the inductive current compensation circuit provides is connected
The inductor current value in the continued flow tube conducting period is subtracted equal to switching tube peak current value.
When switch power converter is Boost type switch power converter, the inductive current compensation circuit includes the
One current mirror, the first operational amplifier, first resistor, the first transistor, 3rd resistor and the 4th resistance；One end of 3rd resistor
For with the electrical connection of the output voltage terminals of switch power converter, one end of the other end of 3rd resistor and the 4th resistance and
The positive input of first operational amplifier is electrically connected；The other end of 4th resistance is grounded；The negative sense of first operational amplifier is defeated
One end of the drain electrode of terminal and the first transistor and first resistor is electrically connected out；The other end of first resistor is grounded；First fortune
Calculate the grid electrical connection of the output terminal and the first transistor of amplifier, one end of the source electrode of the first transistor and the first current mirror
Electrical connection；The inductive current compensation circuit further includes third current mirror, the second current mirror, second operational amplifier, the second electricity
Resistance, second transistor, the 5th resistance and the 6th resistance；One end of 5th resistance is used for and the voltage input of switch power converter
Terminal electrical connection；The other end of 5th resistance and one end of the 6th resistance and the positive input of second operational amplifier are electrically connected
It connects；The other end of 6th resistance is grounded；The drain electrode of the negative sense output terminal and second transistor of second operational amplifier and
One end of two resistance is electrically connected；The other end of second resistance is grounded；The output terminal and second transistor of second operational amplifier
Grid electrical connection, one end electrical connection of the source electrode of second transistor and the second current mirror；One end of third current mirror and first
One end of current mirror is electrically connected, one end electrical connection of the other end of third current mirror and the second current mirror；In third current mirror,
One end with the connection of the second current mirror is used as inductive current thermal compensation signal output terminal simultaneously.
When switch power converter is Buck-Boost type switch power converter, the inductive current compensation circuit packet
Include the 4th current mirror, the 7th resistance, the 8th resistance, third operational amplifier, the 4th transistor and the 5th transistor；8th resistance
One end be used for and switch power converter output voltage terminals be electrically connected；The one of the other end of 8th resistance and the 7th resistance
The electrical connection of the negative input of end and third operational amplifier；The positive output terminal of second operational amplifier is grounded；7th
The drain electrode of the other end of resistance and the 4th transistor is electrically connected；The grid of the output terminal of third operational amplifier and the 4th transistor
The electrical connection of the grid of pole and the 5th transistor, the source electrode of the 4th transistor and the source electrode of the 5th transistor connect power supply；4th
Current mirror includes the 41st transistor and the 40th two-transistor, the grid and the 40th two-transistor of the 41st transistor
Grid electrical connection, the drain electrode of the 41st transistor and the drain electrode of the 40th two-transistor be all grounded, the 41st transistor
Grid and the 41st transistor source electrode electrical connection be used as the 4th current mirror first terminal, the source of the 40th two-transistor
Pole is used as the Second terminal of the 4th current mirror；The drain electrode electrical connection of the first terminal and the 5th transistor of 4th current mirror, the 4th
The Second terminal of current mirror is used as inductive current thermal compensation signal output terminal.
The sampling hold circuit further includes low-pass filtering input control transistor；The input terminal of the low-pass filter circuit
It is electrically connected with the source level of low-pass filtering input control transistor, the grid access of low-pass filtering input control transistor is electric from switch
The second control signal that source converter obtains, the grounded drain of low-pass filtering input control transistor；Low-pass filtering input control
Transistor is controlled by second control signal, when second control signal is low level, low-pass filtering input control transistor turns, and institute
The input signal for stating low-pass filter circuit input terminal is pulled low；The sampling hold circuit further includes second switch, second switch
One end and low-pass filter circuit input terminal electrical connection, the other end of second switch and sampled operational amplifier output end electricity
Connection；Second switch is controlled by the non-signal of the second control signal obtained from switch power converter；Work as second control signal
Non-signal when being high level, second switch closure, sampling hold circuit connects with low-pass filter circuit；Work as second control signal
Non-signal be high level when, second switch open, sampling hold circuit and low-pass filter circuit disconnect.
The utility model, which solves technical solution used by the technical problem, can also be a kind of switch power converter,
Include above-mentioned switch power converter load current detection circuit；
The switch power converter circuit, further includes logic control circuit；The logic control circuit is for generating
The basic switching signal of inductive type switch power converter timing control；The logic control circuit is produced according to basic switching signal
The second control signal of the raw first control signal for control switch pipe and control continued flow tube；First control signal is high level
When, switching tube is opened；When second control signal is high level, continued flow tube is opened；First control signal and second control signal are
The synchronous transformation signal of basic switching signal；Inductive current rise period is synchronized with first control signal；When inductive current declines
Segment sync is in second control signal.
Compared with the existing technology compared with, the beneficial effects of the utility model are: 1, reduce the pin of chip, led in switching tube
Detection switch tube current in the logical period, and in switching tube peak value, sampling keeps this current sampling data, is connected in continued flow tube
Period keeps the sample rate current, and compensates to the electric current, saves the circuit of continued flow tube current detecting, and make to switch
Pipe driving design is simple, greatly reduces the complexity of load current detection circuit, simplifies load current detection circuit；2. subtracting
Few external component is omitted external inspection leakage resistance, has just lacked a part of heating power consumption, improved the efficiency of circuit；And it mentions
The high integrated level of circuit, simplifies electronic circuit, circuit board is small in size, and circuit reliability also greatly promotes；3, due to introducing
Compensation, and the compensation process is due to accurately timing control so that compensation can to a greater extent close to true load current,
Complicated circuit design is not only avoided, the accuracy of load current detection is also improved, and greatly reduces the complexity of circuit
Degree and design difficulty；4, circuit structure is simply ingenious, strong applicability, can be used in the DC/DC of Boost type and Buck-Boost type
Switch power converter；It is also applied for synchronous and asynchronous rectification circuit and is easy to application deployment in Application of integrated circuit, save
Chip area and pin are saved, the complexity and power consumption of load current detection are reduced.
Detailed description of the invention
Fig. 1 is the schematic block diagram of the utility model load current detection circuit preferred embodiment；
Fig. 2 is that principle of the prior art load current detection circuit in the application of DC/DC switch power converter circuit is shown
One of be intended to；
Fig. 3 is prior art load current detection circuit work inductive current and load current under Boost type CCM mode
The correspondence timing and error note schematic diagram of detection；
Fig. 4 is the circuit theory schematic diagram of one of the utility model load current detection circuit preferred embodiment；
Fig. 5 is the circuit theory schematic diagram of one of specific embodiment of inductive current compensation circuit 32 in Fig. 4；
Fig. 6 is two circuit theory schematic diagram of the utility model load current detection circuit preferred embodiment；
Fig. 7 is the circuit theory schematic diagram of one of specific embodiment of inductive current compensation circuit 32 in Fig. 6；
It is the load current detection circuit of the utility model as shown in Figure 8 in Boost type or Buck-boost type switch electricity
Work wave time diagram of the source converter work under CCM continuous operation mode；
It is the load current detection circuit of the utility model as shown in Figure 9 in Boost type or Buck-boost type switch electricity
Work wave time diagram of the source converter work under the discontinuous operating mode of DCM；IFB signal in Fig. 8 and Fig. 9 is negative
Carry the load current signal for the control of switch power converter system of current detection circuit output.
Specific embodiment
The embodiments of the present invention is further described below in conjunction with each attached drawing.
Inductive type switch power converter, basic principle are all to realize voltage change using the energy storage characteristic of inductance,
The change rate of inductive current is equal to voltage across the inductor divided by inductance Henry value, is expressed as using equationInductive current
Variation is linear process, the voltage and electricity of the variation speed, that is, inductive current linear change slope and inductance both ends of inductive current
Feel one timing of applied voltage that inductance value is related, at inductance both ends, when inductance inductance value also determines, the raising and lowering of inductive current
Slope is also fixed.
Existing booster type Boost type switch power converter circuit and the conversion of negative voltage Buck-Boost type Switching Power Supply
In device circuit, two power tubes are referred to as switching tube and continued flow tube.Signified switch power converter in the utility model
Foundation characteristic include: under CCM operating mode, switch power converter pass through logic control circuit control switch pipe and afterflow
Pipe alternate conduction, one switch periods include inductive current rise time section and inductive current fall time section；In DCM work
Under operation mode, switch power converter controls two switching tubes and continued flow tube alternate conduction by logic control circuit and is spaced pass
It closes, that is, in a switch periods, including inductive current rise time section, inductive current fall time section and inductive current
The period for being zero.
The inductive current typical waveform of switch power converter as shown in Figure 3 is as it can be seen that after switching tube conducting, inductive current
It begins to ramp up, until switching tube is closed, inductive current reaches vertex；Continued flow tube is begun to turn on, and inductive current is begun to decline, until
End cycle.So only needing to acquire the area of the diagonal line hatches in continued flow tube turn-on time, that is, export total charge dosage.N number of
The sum of shaded area of continuous cycles can be obtained by the size of load current divided by total time in period.
As shown in figure 3, if within the full switch period, it is always maintained at the peak point current of continued flow tube as load current,
Opposite actual loading electric current has had more one piece of triangle shaded area as shown by hatched lines in FIG., using continued flow tube peak point current
There are the errors of dash area between the electric current and true load current that sampling is kept.Further, at sampling continued flow tube peak
It is worth in the technical solution of electric current and there are many circuit implementation, if after continued flow tube is substituted by diode, current mirror framework
Load current detection circuit would be unavailable for the load current detection of asynchronous rectification.
It is all in switching tube turn-on cycle to inductance in the switch power converter of Boost type and Buck-Boost type
Storage energy only charges to load output energy in continued flow tube turn-on cycle within the switch conduction period to inductance,
Energy do not exported to load, therefore the prior art is usually inductive current during sampling continued flow tube conducting as load current,
From Fig. 3, it is only necessary to the area for acquiring the diagonal line hatches in continued flow tube turn-on time, the shaded area of N number of continuous cycles
The sum of can be obtained by the size of load current divided by total time in period.
Also there is portion of techniques scheme in the prior art, is the peak point current by detecting continued flow tube, and using to the peak value
Current sample keeps the load current as a switch periods.From Fig. 3 it can be seen that, if protected always in switch periods
Peak point current is held, area has had more one piece of triangle shaded area, this is sampling error.
In this patent, not sample continued flow tube peak point current, sampling be switching tube conducting the period inductive current
Peak value begins to keep after continued flow tube is begun to turn on, until current switch period terminates or inductance inductive current drops to zero.
To conventional switch power converter, the inductor current value of detection control switch pipe conducting period is required usually to prevent inductance electricity
Stream is saturated and damages, therefore inductive current peak sample circuit can share, also just It is not necessary to which a set of special needle is in addition arranged
To the inductive current sampling circuit of continued flow tube conducting period.
Further, inductive current compensation circuit is devised in this patent, carries out current compensation during continued flow tube conducting,
To eliminate since current peak samples bring error.In the electric current of switching tube turn-on cycle detection switch pipe, and in switching tube
The size that eve sampling keeps this electric current is closed, is exactly the peak value of inductive current.Sampling is kept in continued flow tube conducting
Peak point current, while exporting sampled signal to low-pass filter, while compensation electric current is also added and simulates continued flow tube
The decline process of inductive current, substantially increases the accuracy of detection.
As shown in figure 4, it is excellent to be that the utility model load current detection circuit is applied in Boost type switch power converter
Select example.When second control signal DRN is high level, after turning on the switch pipe i.e. M1 pipe, switching tube peak point current sample circuit 30
In M2 pipe be M1 pipe mirror image pipe, due to the empty short characteristic of amplifier, the drain voltage of M2 pipe and M1 pipe is consistent.M2 pipe
Size of current be M1 tube current 1/K, K be M1 pipe and M2 pipe composition current mirror mirror amplification size.M2 pipe
Electric current IM2 and M1 tube current IM1 between relationship be:Voltage on sampling capacitance C1 is with M1 pipe
Electric current increases and gets higher.
As shown in figure 4, before turning off the switch pipe i.e. M1 pipe in a flash, being adopted when second control signal DRN is lower level
The voltage stored on sample capacitor C1 is inductive current peak.After second control signal DRN becomes low level, inductive current compensation
Circuit 32 can slowly discharge to sampling capacitance C1, the process of simulaed inductance electric current decline.Voltage letter on inside inspection leakage resistance Rs
It number is exactly the inductor current signal for coming out continued flow tube simulated, which is that switching tube peak point current subtracts inductance electricity
Flow the current compensation signal that compensation circuit 32 exports.To realize the load current detection of Boost type voltage changer.Fig. 4
In M3 pipe as continued flow tube, can be substituted by diode, i.e. the method for the utility model can be applied to diode conduct
In the switch power converter application of the asynchronous rectification of continued flow tube.
It is inductive current compensation circuit in the load current detection circuit of Boost type switch power converter as shown in Figure 5
32 preferred embodiment.
As shown in figure 5, when switch power converter is Boost type switch power converter, the inductive current compensation
Circuit 32 include the first current mirror, the first operational amplifier OA1, first resistor R1, the first transistor MA1,3rd resistor R3 and
4th resistance R4；One end of 3rd resistor R3 is used for and the output voltage terminals of switch power converter are electrically connected, 3rd resistor
The positive input of one end and the first operational amplifier OA1 of the other end of R3 and the 4th resistance R4 is electrically connected；4th resistance
The other end of R4 is grounded；The drain electrode and first of the negative sense output terminal and the first transistor MA1 of first operational amplifier OA1
One end of resistance R1 is electrically connected；The other end of first resistor R1 is grounded；The output terminal of first operational amplifier OA1 and the first crystalline substance
The grid of body pipe MA1 is electrically connected, one end electrical connection of the source electrode of the first transistor MA1 and the first current mirror；The inductive current
Compensation circuit 32 further includes third current mirror, the second current mirror, second operational amplifier OA2, second resistance R2, second transistor
MA2, the 5th resistance R5 and the 6th resistance R6；One end of 5th resistance R5 is used for and the voltage input-terminal of switch power converter
Electrical connection；The positive input of the other end of 5th resistance R5 and one end of the 6th resistance R6 and second operational amplifier OA2
Electrical connection；The other end of 6th resistance R6 is grounded；The negative sense output terminal and second transistor MA2 of second operational amplifier OA2
Drain electrode and second resistance R2 one end electrical connection；The other end of second resistance R2 is grounded；Second operational amplifier OA2's is defeated
The grid of terminal and second transistor MA2 are electrically connected out, and the source electrode of second transistor MA2 and one end of the second current mirror are electrically connected
It connects；One end of third current mirror and the electrical connection of one end of the first current mirror, the other end of third current mirror and the second current mirror
One end electrical connection；In third current mirror, one end with the connection of the second current mirror is used as the output of inductive current thermal compensation signal simultaneously
Terminal.
As shown in figure 5, the first current mirror includes the 11st transistor MA11 and the tenth two-transistor MA12, the 11st crystal
The electrical connection of the grid of the grid of pipe MA11 and the tenth two-transistor MA12, the drain electrode of the 11st transistor MA11 and the 12nd crystal
The drain electrode of pipe MA12 is electrically connected, and the source electrode electrical connection of the grid of the 11st transistor MA11 and the 11st transistor MA11 are used as the
The first terminal of one current mirror, the source electrode of the tenth two-transistor MA12 are used as the Second terminal of the first current mirror.
As shown in figure 5, the second current mirror include the 21st transistor MA21 and the 20th two-transistor MA22, the 20th
The grid electrical connection of the grid and the 20th two-transistor MA22 of one transistor MA21, the drain electrode of the 21st transistor MA21
Drain electrode with the 20th two-transistor MA22 is electrically connected, the grid and the 20th two-transistor MA22 of the 20th two-transistor MA22
Source electrode electrical connection be used as the first terminal of the second current mirror, the source electrode of the 21st transistor MA21 is used as the second current mirror
Second terminal.
As shown in figure 5, third current mirror include the 31st transistor MA31 and the 30th two-transistor MA32, the 30th
The grid electrical connection of the grid and the 30th two-transistor MA32 of one transistor MA31, the drain electrode of the 31st transistor MA31
With the grounded drain of the 30th two-transistor MA32, the grid of the 31st transistor MA31 and the 31st transistor MA31's
Source electrode electrical connection is used as the first terminal of third current mirror, and the source electrode of the 30th two-transistor MA32 is used as the of third current mirror
Two-terminal.
It is said as shown in figure 5, carrying out type switch power converter for Boost, the sum of switching tube and continued flow tube turn-on time
It is defined as T, wherein the duty ratio of switching tube turn-on time is D, then has: D × VIN=(1-D) × Vo(formula 1)；Wherein, VOFor
The output above earth potential of switch power converter, VINFor the input above earth potential of switch power converter.So opened in Boost type
In powered-down source converter, the peak-to-peak value of inductive current are as follows:Wherein L is external inductance
Henry numerical value.
If Boost is in continuous operation mode, the peak-to-peak value of inductive current is embodied in the voltage on sampling capacitance C1
Variation isWherein Rs is sampling resistor in piece.
If desired the compensation electric current for allowing inductive current compensation circuit to export can be compensated just during falling continued flow tube conducting
Curent change trend compensates electric current I1It should meet:
ΔVSEN×C1=I1× (1-D) × T (formula 4)；
Wushu 3 is brought formula 4 into and can be obtained:
And according to formula 1 it is found that
Therefore compensation electric current I can be acquired1Size are as follows:
As Fig. 5 design inductive current compensation circuit embodiment in, the resistance value phase of first resistor R1 and second resistance R2
Deng i.e. R1=R2, compensation electric current I1It is equal toAppropriate selection sampling capacitance C1, electricity in compensation circuit
Hinder R1And sample rate current in sampling resistor Rs and peak point current sample circuit 30 in the piece of peak point current sample circuit
Relationship between amplification factor K and external inductance L, can make the detection of continued flow tube turn-on cycle consistent with inductive current.In Vo
And VINBetween difference range it is smaller when, a constant current source can be designed as with inductive current compensation circuit, is made
It is a constant compensation electric current I that it, which is exported,1, the precision only compensated in this way decreases.
It is the preferred reality that load current detection circuit is applied in Buck-Boost type switch power converter as shown in Figure 6
Example.After second control signal DRH is that low level opens M11 pipe i.e. switching tube, M12 pipe is the mirror image pipe of M11 pipe, due to amplifier
Empty short characteristic, the drain voltage of M12 and M11 pipe are consistent.The size of current of M12 pipe is the 1/K of M11 tube current, and K is
The size of the current mirror mirror amplification of the composition of M11 pipe and M12 pipe.Sampling capacitance C11 samples the peak value of inductive current
Later, one part of current is compensated by inductive current compensation circuit.
As shown in fig. 7, being the electricity used in the load current detection circuit of Buck-Boost type switch power converter
The preferred design of inducing current compensation circuit 32.
As shown in fig. 7, when switch power converter is Buck-Boost type switch power converter, the inductive current
Compensation circuit 32 includes the 4th current mirror, the 7th resistance R7, the 8th resistance R8, third operational amplifier OA3, the 4th transistor
MA4 and the 5th transistor MA5；One end of 8th resistance R8 is used for and the output voltage terminals of switch power converter are electrically connected；
The electrical connection of the negative input of the other end of 8th resistance R8 and one end of the 7th resistance R7 and third operational amplifier OA3；
The positive output terminal of third operational amplifier OA3 is grounded；The other end of 7th resistance R7 and the drain electrode electricity of the 4th transistor MA4
Connection；The grid of the output terminal of third operational amplifier OA3 and the grid of the 4th transistor MA4 and the 5th transistor MA5
Electrical connection, the source electrode of the 4th transistor MA4 and the source electrode of the 5th transistor MA5 connect the external input of switch power converter
Power supply VIN。
As shown in fig. 7, the 4th current mirror include the 41st transistor MA41 and the 40th two-transistor MA42, the 40th
The grid electrical connection of the grid and the 40th two-transistor MA42 of one transistor MA41, the drain electrode of the 41st transistor MA41
Drain electrode with the 40th two-transistor MA42 is all grounded, the grid and the 41st transistor MA41 of the 41st transistor MA41
Source electrode electrical connection be used as the first terminal of the 4th current mirror, the source electrode of the 40th two-transistor MA42 is used as the 4th current mirror
Second terminal；The drain electrode electrical connection of the first terminal and the 5th transistor MA5 of 4th current mirror, the Second terminal of the 4th current mirror
As inductive current thermal compensation signal output terminal.
As shown in fig. 7, for Buck-Boost type switch power converter, switching tube and continued flow tube turn-on time
The sum of be defined as T, wherein the duty ratio of switching tube turn-on time be D, then have: D × VIN=(1-D) × Vo(formula 5)；Its electricity
The peak-to-peak value of inducing current is
If Buck-Boost type switch power converter is in continuous operation mode, the peak-to-peak value of inductive current embodies
In the voltage change of sampling capacitance are as follows:Wherein Rs is sampling resistor in piece.
If desired the compensation electric current for allowing inductive current compensation circuit to export can be compensated just during falling continued flow tube conducting
Curent change trend compensates electric current I1It should meet:
ΔVSEN×C11=I1× (1-D) × T (formula 8)；Wushu 5,6 and 7 is brought formula 8 into and can be obtained:
Compensation electric current I can be acquired1Size be
Such as the circuit that Fig. 7 is designed, due to the short characteristic of void of amplifier, R8 resistance both end voltage is equal to 0-Vo, so it is generated
Mirror compensated electric current I1It is equal toAppropriate selection sampling capacitance C11, the 7th resistance R in compensation circuit7And
The amplification factor K of sampling resistor Rs and peak point current sampling circuit samples electric current and outer in the piece of peak point current sample circuit
Relationship between inductance L is connect, the detection of continued flow tube turn-on cycle can be made consistent with inductive current.In VoVariation range ratio
When lesser, inductive current compensation circuit can be designed as a constant current source, and making its output is a constant compensation
Electric current I1, the precision only compensated in this way decreases.
It is the load current detection circuit of the utility model as shown in Figure 8 in Boost type or Buck-boost type switch electricity
Work wave time diagram of the source converter work under CCM continuous operation mode；As second control signal DRN or DRH etc.
When high level, inductive current is begun to ramp up, and inductive current peak sample circuit begins to work, inductive current sampling letter
Number VSEN1Increase as inductive current increases, after inductive current reaches vertex, first switch K1/K11 is disconnected, sampling capacitance
What is kept on C1/C11 capacitor is inductive current peak.If not compensating current circuit, in inductive current inductance decline cycle
Current sampling signal VSEN1Exactly one is parallel to the approximately constant value of X-axis line, and such sampling hold mode has bigger
Error.In the utility model, the compensation electric current I of addition1, within the period of inductive current decline, the decline of simulaed inductance electric current
Slope, reduce error.In inductive current decline cycle, second switch K2/K12, the electricity of sampling hold circuit output are opened
Stream sampling keeps signal VSEN2It exports to the input terminal of low-pass filter, the accurate big of inductive current is obtained after low-pass filtered
It is small.
It is the load current detection circuit of the utility model as shown in Figure 9 in Boost type or Buck-boost type switch electricity
Source converter work waveform time diagram under DCM mode, that is, discontinuous operating mode.Its working principle is identical with Fig. 8, only
Be work in dcm mode, the peak value of Vsen2 is smaller, compensation electric current the electricity of sampling capacitance can be put in one cycle
Fall, the period that characterization inductive current is 0.
In the embodiment not shown in some drawings, the logic control circuit in switch power converter is not only
The basic switching signal of switch power converter is generated, such as pwm switching signal is also generated for controlling two power switch tubes
First control signal DRP, second control signal DRN；When first control signal DRP is high level, one of power tube is opened；
When second control signal DRN is high level, another power tube is opened；The first control signal DRP of control switch pipe and control
The second control signal DRN of continued flow tube processed based on pwm switching signal by generating, therefore first control signal DRP, second
The transformation signal that signal DRN is pwm signal is controlled, is synchronous between each signal.Inductive current rise time section and inductance electricity
Flow down drop the period be synchronized with first control signal DRP and second control signal DRN.
A kind of switch power converter load current detection method, comprising the following steps: sampling obtain Boost type or
Buck-Boost type switch power converter inductive current rise period, that is, switching tube conducting period in current switch period
Peak point current；It is sampled by the peak point current that sampling hold circuit keeps inductive current rise period, that is, switching tube that the period is connected
Value；The period is connected in inductive current decline period, that is, continued flow tube in current switch period, is mended using inductive current compensation circuit
The inductive current decline process for repaying the continued flow tube conducting period, is connected period peak value by inductive current compensation circuit compensating switch pipe
Current sampling data, the compensated sampled holding circuit of inductor current signal export after keeping, the letter of sampling hold circuit output
The load current signal of switch power converter number is obtained after smooth using low-pass filter.
Decline period, that is, continued flow tube in inductive current and period, the compensation electric current that the inductive current compensation circuit provides is connected
The inductor current value in the continued flow tube conducting period is subtracted equal to switching tube peak current value.The inductive current compensation circuit 32 is
Current source.
Switch power converter load current detection circuit includes for obtaining Boost type or Buck-Boost type switch
Switching tube peak point current sample circuit, sampling hold circuit, the inductive current of power adapter switching tube peak-current signal are mended
Repay circuit and low-pass filter circuit；Sampling hold circuit obtains switching tube peak point current letter from switching tube peak point current sample circuit
Number；During the continued flow tube conducting of switch power converter, switch tube peak-current signal carries out current compensation, is compensated
Inductor current signal afterwards；Low-pass filter circuit and sampling hold circuit electrical connection, carry out compensated inductor current signal
Output is used as load current signal after low-pass filtering.Circuit is simplified, the accuracy and reliability of detection is improved, reduces into
Sheet and power consumption.
In above-mentioned load current detection method, electric current first in switching tube turn-on cycle detection switch pipe, and opening
Sampling keeps the size of this electric current, the during this period input of sampling hold circuit and low-pass filter when closing tube current peak value
Electrical connection between end disconnects, and the input of low-pass filter is pulled to ground；Sample rate current is kept in continued flow tube conducting, to low
Bandpass filter exports sampled signal, while a compensation electric current is added also to simulate the decline process of the inductive current of continued flow tube,
Substantially increase the accuracy of detection.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Using equivalent structure or equivalent flow shift made by utility model specification and accompanying drawing content, it is applied directly or indirectly in it
His relevant technical field, is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of switch power converter load current detection circuit, it is characterised in that:
Including the switching tube for obtaining Boost type or Buck-Boost type switch power converter switching tube peak-current signal
Peak point current sample circuit (30), for switching tube peak point current sampled signal keep sampling hold circuit (34), for opening
Close the inductive current compensation circuit (32) and low-pass filter circuit (35) of the compensation of pipe peak point current sampled signal；
Switching tube peak point current sample circuit (30) and sampling hold circuit (34) electrical connection, sampling hold circuit (34) is from switch
Pipe peak point current sample circuit (30) obtains switching tube peak-current signal；
Inductive current compensation circuit (32) and sampling hold circuit (34) electrical connection are connected in the continued flow tube of switch power converter
Period, switch tube peak-current signal carry out current compensation, obtain compensated inductor current signal；
Low-pass filter circuit (35) and sampling hold circuit (34) electrical connection, pass through low pass filtered to compensated inductor current signal
Output is used as load current signal after wave.
2. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
The sampling hold circuit (34) includes first switch (K1/K11), sampling capacitance (C1/C11) and sampled operational amplifier
(OAS1/OAS2)；One end of first switch (K1/K11) and switching tube peak point current sample circuit (30) electrical connection, first switch
(K1/K11) one end of the other end and sampling capacitance (C1/C11) and the forward direction of sampled operational amplifier (OAS1/OAS2) are defeated
Enter end electrical connection；The other end of sampling capacitance (C1/C11) is grounded；The negative input of sampled operational amplifier (OAS1/OAS2)
It is electrically connected with the output end of sampled operational amplifier (OAS1/OAS2)；Inductive current compensation circuit (32) and sampling capacitance (C1/
The positive input electrical connection of one end and sampled operational amplifier (OAS1/OAS2) C11)；
First switch (K1/K11) is controlled by the second control signal (DRN/DRH) obtained from switch power converter；Second control
When signal (DRN/DRH) processed is high level, first switch (K1/K11) closure makes sampling hold circuit (34) and switching tube peak
It is worth current sampling circuit (30) electrical connection；When second control signal (DRN/DRH) is low level, first switch (K1/K11) is beaten
It opens, makes to disconnect between sampling hold circuit (34) and switching tube peak point current sample circuit (30).
3. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
Third switch is provided between inductive current compensation circuit (32) and sampling hold circuit (34)；Third switch be controlled by from
The first control signal (DRP/DRL) that switch power converter obtains；When first control signal (DRP/DRL) is high level,
Third closes the switch, and is electrically connected sampling hold circuit (34) and inductive current compensation circuit (32)；First control signal (DRP/
DRL when) DRN is low level, third switch is opened, and is made between sampling hold circuit (34) and inductive current compensation circuit (32)
It disconnects；
Or the third switch is diode, controls sampling hold circuit (34) and electricity by the voltage signal at the diode both ends
Inducing current compensation circuit is connected or disconnected with connection between (32).
4. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
The inductive current compensation circuit (32) is current source.
5. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
Decline period, that is, continued flow tube in inductive current and the period is connected, the compensation electric current that the inductive current compensation circuit provides is equal to
Switching tube peak current value subtracts the inductor current value in the continued flow tube conducting period.
6. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
When switch power converter is Boost type switch power converter,
The inductive current compensation circuit (32) includes the first current mirror, the first operational amplifier (OA1), first resistor (R1),
The first transistor (MA1), 3rd resistor (R3) and the 4th resistance (R4)；One end of 3rd resistor (R3) is used for and Switching Power Supply turns
The output voltage terminals of parallel operation are electrically connected, one end and the first operation of the other end of 3rd resistor (R3) and the 4th resistance (R4)
The positive input of amplifier (OA1) is electrically connected；The other end of 4th resistance (R4) is grounded；First operational amplifier (OA1)
The drain electrode of negative sense output terminal and the first transistor (MA1) and one end electrical connection of first resistor (R1)；First resistor (R1)
The other end ground connection；The grid electrical connection of the output terminal and the first transistor (MA1) of first operational amplifier (OA1), first
One end electrical connection of the source electrode and the first current mirror of transistor (MA1)；
The inductive current compensation circuit (32) further include third current mirror, the second current mirror, second operational amplifier (OA2),
Second resistance (R2), second transistor (MA2), the 5th resistance (R5) and the 6th resistance (R6)；It uses one end of 5th resistance (R5)
In the voltage input-terminal electrical connection with switch power converter；The one of the other end of 5th resistance (R5) and the 6th resistance (R6)
The electrical connection of the positive input of end and second operational amplifier (OA2)；The other end of 6th resistance (R6) is grounded；Second operation
The drain electrode of the negative sense output terminal and second transistor (MA2) of amplifier (OA2) and one end electrical connection of second resistance (R2)；
The other end of second resistance (R2) is grounded；The output terminal of second operational amplifier (OA2) and the grid of second transistor (MA2)
Electrical connection, one end electrical connection of the source electrode and the second current mirror of second transistor (MA2)；
One end of third current mirror and the electrical connection of one end of the first current mirror, the other end of third current mirror and the second current mirror
One end electrical connection；In third current mirror, one end with the connection of the second current mirror is used as the output of inductive current thermal compensation signal simultaneously
Terminal.
7. switch power converter load current detection circuit as described in claim 1, it is characterised in that:
When switch power converter is Buck-Boost type switch power converter,
The inductive current compensation circuit (32) includes the 4th current mirror, the 7th resistance (R7), the 8th resistance (R8), third operation
Amplifier (OA3), the 4th transistor (MA4) and the 5th transistor (MA5)；
One end of 8th resistance (R8) is used for and the output voltage terminals of switch power converter are electrically connected；8th resistance (R8)
The negative input of one end and third operational amplifier (OA3) of the other end and the 7th resistance (R7) is electrically connected；Second operation
The positive output terminal of amplifier is grounded；The drain electrode electrical connection of the other end and the 4th transistor (MA4) of 7th resistance (R7)；
The grid and the 5th transistor (MA5) of the output terminal of third operational amplifier (OA3) and the 4th transistor (MA4)
Grid electrical connection, the source electrode of the 4th transistor (MA4) and the source electrode of the 5th transistor (MA5) connect power supply；
4th current mirror includes the 41st transistor (MA41) and the 40th two-transistor (MA42), the 41st transistor
(MA41) electrical connection of the grid of grid and the 40th two-transistor (MA42), the drain electrode of the 41st transistor (MA41) and the
The drain electrode of 40 two-transistors (MA42) is all grounded, the grid and the 41st transistor of the 41st transistor (MA41)
(MA41) source electrode electrical connection is used as the first terminal of the 4th current mirror, and the source electrode of the 40th two-transistor (MA42) is used as the 4th
The Second terminal of current mirror；
The drain electrode of the first terminal of 4th current mirror and the 5th transistor (MA5) is electrically connected, and the Second terminal of the 4th current mirror is used
Make inductive current thermal compensation signal output terminal.
8. switch power converter load current detection circuit as claimed in claim 2, it is characterised in that:
The sampling hold circuit (34) further includes low-pass filtering input control transistor；
The input terminal of the low-pass filter circuit (35) is electrically connected with the source level of low-pass filtering input control transistor, low-pass filtering
The grid of input control transistor accesses the second control signal (DRN/DRH) obtained from switch power converter, low-pass filtering
The grounded drain of input control transistor；Low-pass filtering input control transistor is controlled by second control signal (DRN/DRH), the
When two controls signal (DRN/DRH) are low level, low-pass filtering input control transistor turns, the low-pass filter circuit (35)
The input signal of input terminal is pulled low；
The sampling hold circuit (34) further includes second switch (K2/K12), one end of second switch (K2/K12) and low pass filtered
The input terminal of wave circuit (35) is electrically connected, and the other end and sampled operational amplifier output end of second switch (K2/K12) are electrically connected
It connects；
Second switch (K2/K12) is controlled by the non-signal of the second control signal obtained from switch power converterWhen the non-signal of second control signal is high level, second switch (K2/K12) closure, sampling is kept
Circuit (34) is connected with low-pass filter circuit (35)；When the non-signal of second control signal is high level, second switch (K2/
K12 it) opens, sampling hold circuit (34) and low-pass filter circuit (35) disconnect.
9. a kind of switch power converter, it is characterised in that:
Include switch power converter load current detection circuit described in any one of the claims 1 to 8.
10. switch power converter as claimed in claim 9, it is characterised in that:
It further include logic control circuit；The logic control circuit is for generating inductive type switch power converter timing control
Basic switching signal；
The logic control circuit generates the first control signal (DRP/DRL) for being used for control switch pipe according to basic switching signal
With the second control signal (DRN/DRH) of control continued flow tube；When first control signal (DRP/DRL) is high level, switching tube is beaten
It opens；When second control signal (DRN/DRH) is high level, continued flow tube is opened；First control signal (DRP/DRL) and the second control
Signal (DRN/DRH) is the synchronous transformation signal of basic switching signal；Inductive current rise period is synchronized with first control signal
(DRP/DRL)；Inductive current declines period synchronization in second control signal (DRN/DRH).
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| CN111799985A (en) * | 2020-05-27 | 2020-10-20 | 华为技术有限公司 | Signal sampling device and conversion device |
| CN112067886A (en) * | 2020-08-27 | 2020-12-11 | 广州金升阳科技有限公司 | Current detection circuit of switching power supply device |
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| CN112067886A (en) * | 2020-08-27 | 2020-12-11 | 广州金升阳科技有限公司 | Current detection circuit of switching power supply device |
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| CN116827087B (en) * | 2023-07-14 | 2024-02-09 | 江苏展芯半导体技术股份有限公司 | Switching power supply current estimation method applied to DCM/BCM mode |
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Effective date of registration: 20200428 Address after: 221212 No.1, Linkong Avenue, Shuanggou Town, Suining County, Xuzhou City, Jiangsu Province Patentee after: Jiangsu Weiming Huaxin Semiconductor Co., Ltd Address before: Baoan District Xin'an street Shenzhen city Guangdong province 518101 67 District 3 building 1101 COFCO Powerise factory Patentee before: SHENZHEN HOTCHIP TECHNOLOGY Co.,Ltd. |