CN106961216B - Novel constant exports electric current BUCK circuit - Google Patents
Novel constant exports electric current BUCK circuit Download PDFInfo
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- CN106961216B CN106961216B CN201710339054.4A CN201710339054A CN106961216B CN 106961216 B CN106961216 B CN 106961216B CN 201710339054 A CN201710339054 A CN 201710339054A CN 106961216 B CN106961216 B CN 106961216B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Abstract
The invention discloses novel constants to export electric current BUCK circuit, it include: an inspection leakage resistance, rectifier switch node is connected to after one end concatenation inductor rectifier, the other end connects output cathode, output capacitance, one end connects output cathode, the other end connects output negative pole, high location switch connects input power anode and rectifier switch node, low-side switch connects input power cathode and rectifier switch node, first signal amplifies translation module, generate triangular signal, second signal amplifies translation module, generate real-time current signal, mean value calculation module, obtain embodying the average current signal of inductance average current value according to real-time current signal.Compared with prior art, the present invention solves the problems, such as the matching of high location switch, only with an inspection leakage resistance, avoids increase and the decrease in efficiency of cost, the precision for also ensuring output electric current simultaneously is not in frequency uncertain the problem of waiting influences actual use.
Description
Technical field
The invention belongs to buck DC-DC fields more particularly to novel constant to export electric current BUCK circuit, and being used for will be higher
The electric energy of voltage, inductance rectification, is converted into the electric energy of lower voltage, and the electric current output kept constant.
Background technique
In mobile phone charging and LED driving application, it is often necessary to have the electric energy input of constant current function, therefore right
Growing day by day in the DC-DC demand for having constant current output function, especially in mobile phone charging application, current needs are increasingly
Greatly, and high-precision constant current is required.
BUCK (BUCK circuit) is that DC-DC one of works as, and is exactly non-isolated buck DC-DC.BUCK has high-precision
Constant current output function is spent, while there is wide applicability again, reliable and stable, low in cost, catering to very much current industry needs
It asks, is particularly suitable for vehicle-mounted charge.
BUCK is generally divided into: current-mode control loop, voltage mode control loop and various opened loop control loops.Wherein,
Current-mode control loop and voltage mode control loop belong to close-loop control mode.Due to current-mode control loop stability sexual clorminance
And current-mode control loop is all selected in the advantage that transient response speed is fast, most closed-loop controls.
Current-mode control loop work process is as follows:
One dynamic current triangular signal (abbreviation triangular signal), and inductive current real-time synchronization,
One modulated signal carries out error amplification by an amplifier by output signal and reference signal and generates,
Triangular signal and modulated signal are compared, and then determine the shutdown moment of high location switch,
Meanwhile the start-up time of high location switch is determined by the clock signal of oscillator,
When output signal is higher relative to reference signal, reduce modulated signal, and then shorten high location switch conducting when
Between,
When output signal is relatively low relative to reference signal, increase modulated signal, and then increase high location switch conducting when
Between,
The modulation of the high location switch turn-on time duty ratio under fixed frequency is realized by the above working method, also
It is the PWM (pulse width modulation) usually said, and is stablized output signal value intimate with a reference value by way of negative-feedback
Equal numerical value.
Have the BUCK of constant current output function, is exactly that will export electric current as feedback signal, passes through the side PWM described above
Formula, by outputting current steadily in the numerical value almost equal with preset a reference value, that is, constant output current.Since BUCK has
The presence of output capacitance, inductive current are filtered by output capacitance, become stable electric current by the electric current changed up and down.
The BUCK of existing constant current output, dynamic current detection and output electric current measure be all it is separated, common are with
Under several implementations:
1, by the internal resistance detection dynamic current of high location switch, additionally by an inspection leakage resistance detection output electric current.Ginseng
See Fig. 1, Fig. 2, the two project plan comparisons are similar, and unique difference is the anode or output negative pole that will be examined leakage resistance and be placed on output.
Both schemes are all that will examine leakage resistance to be serially connected on output channel, can directly detect the number of output electric current
Value, the disadvantage is that there is the requirement of matching to high location switch, it is desirable that the internal resistance of high location switch must can be applicable in control circuit
In range, it not so may result in the variation of loop gain and then cause stability problem, require in addition that the unlatching of high location switch
Time cannot be longer than the blanking time being arranged inside circuit, not so be also possible to cause the stability problem of loop, or even lead
DC-DC is caused to lose fan-out capability.Although can also be asked by the matching that complicated circuit improves high location switch to a certain extent
Topic, but will increase the complexity and scheme cost of circuit, and matching problem still can not be fully solved.Therefore the program
It is relatively specific for integrated high location switch or solidifies the circuit of high location switch, be not particularly suited for high location switch Parameter uncertainties
DC-DC controller application.
2, another traditional scheme concatenates an inspection leakage resistance for detecting dynamic current in high location switch one end, and
With another inspection leakage resistance detection output electric current.Referring to Fig. 3, Fig. 4, although this scheme solves high location switch matching and asks
Topic, but need in addition to increase an inspection leakage resistance dedicated for detecting dynamic current, inspection leakage resistance uses high-precision big mostly
On the one hand power resistor results in the increase of cost, still further aspect also will increase energy loss, causes system transfer efficiency
Decline.It is bigger to export electric current, when inspection leakage resistance resistance value is bigger and output voltage is lower, efficiency decline is more serious.
3, another only detects the peak value of electric current, and the opened loop control scheme for keeping the peak value of electric current fixed.Referring to
Although Fig. 5, the program solve the problems, such as high location switch matching, while only avoiding increase inspection leakage resistance with an inspection leakage resistance
Brought increased costs and efficiency decline, but the circuit can only manage peak I _ peak of electric current, and exporting electric current is
Equal to the average value of inductive current, the valley I_valley of electric current can follow inductance inductance value, input voltage, output voltage and frequency
The variation of these factors and change, for most applicable cases, these factors all unavoidably have certain change
Change range, therefore I_valley also becomes a uncertain value therewith, therefore average current I_avg can also change therewith, such as
Shown in Fig. 6, when input supply voltage rising leads to the increase of the inductive current rate of rise, since frequency and I_peak are constant, I_
Valley can be reduced, and then I_avg is caused to reduce.Although I_peak relatively determine, due to I_valley not really
Fixed, the I_avg actually obtained can be that the poor numerical value of a precision is difficult to accomplish the precision within 20% in practical applications,
Namely it is difficult to meet the requirement of charging application.
4, the peak value of electric current and the circuit arrangement of valley are detected simultaneously there are also a kind of.Referring to Fig. 7, which solves a high position
Matching problem is switched, and at the same time the valley I_valley of peak I _ peak of detection electric current and electric current, rise in electric current
High location switch is turned off when peak reference, opens low-side switch, low-side switch is turned off when electric current is down to valley benchmark, is opened high-order
Switch, theoretically in the case where I_peak and I_valley are determined, average current I_avg=(I_peak+I_vally)/2
It is also determining.But the program brings new problem:
On the one hand, practical due to the delay of comparator at the time of electric current rises to peak reference or is down to valley benchmark
The inductive current that high location switch turns off the moment can be more bigger than the peak value of preset electric current, the inductance of practical high location switch start-up time
Electric current also can be more smaller than the valley of preset electric current, due to the uncertainty and the electric current rate of rise and descending slope of delay
Uncertainty, the current precision actually obtained is still limited.
On the other hand, more it is essential that the switch periods of DC-DC, which are equal to inductive current, rises to peak reference, in addition
Dropping to the time of valley benchmark from peak reference, this time had both been decided by the difference between peak reference and valley benchmark,
It is also dependent upon the raising and lowering speed of inductive current.And the raising and lowering speed of inductive current can be by inductance inductance value, input
The influence of voltage and output voltage, as shown in figure 8, after input voltage increases, since I_peak and I_valley are constant, and it is electric
Feel the rate of rise to increase, results in frequency raising.As soon as therefore the switch periods of DC-DC is caused to become a uncertain value,
Be DC-DC switching frequency it is uncertain.And in major applications, because to consider EMC factor and other noise frequencies
Section limits, it is therefore desirable to which the switching frequency of DC-DC is relatively stable.This uncertain scheme of frequency is obviously unable to satisfy frequency
Metastable requirement.
Summary of the invention
In view of this, it is necessory to provide it is a kind of solve the problems, such as the matching of high location switch, only with an inspection leakage resistance,
Increase and the decrease in efficiency of cost are avoided, while also ensuring the precision of output electric current, is not in that frequency is not true
The novel constant of fixed the problem of waiting influences actual use exports electric current BUCK circuit.
In order to overcome the shortcomings of the prior art, the present invention the following technical schemes are provided:
Novel constant exports electric current BUCK circuit, comprising: inspection leakage resistance, one and only one, one end concatenates rectified current
Rectifier switch node is connected to after sense, the other end connects output cathode,
Output capacitance, one end connect output cathode, and the other end connects output negative pole,
High location switch connects input power anode and rectifier switch node,
Low-side switch connects input power cathode and rectifier switch node,
The node that inductor rectifier is connect with inspection leakage resistance is current sample anode, the section that inspection leakage resistance is connect with output capacitance
Point is current sample cathode,
First signal amplifies translation module, generates the triangular signal for being used for PWM modulation,
Second signal amplifies translation module, generates real-time current signal,
Mean value calculation module receives the real-time current signal of second signal amplification translation module output, by average value
After calculating, the average current signal for embodying inductance average current value is obtained,
Error amplifier block, for average current signal to be compared with reference signal, output PWM modulation signal,
The average current signal is inductance average current signal, and the inductance refers to inductor rectifier,
PWM comparator module, for PWM modulation signal to be compared with triangular signal, in triangular signal and PWM
Modulated signal voltage value reaches equivalent voltage at the time of point, exports the cut-off signals of high location switch,
Logic and driver circuit module are rectified, the cut-off signals of high location switch are received, is received from oscillator module
Clock signal, open signal of the clock signal as high location switch, exports high location switch driving signal and low-side switch is driven
Dynamic signal,
The clock signal is fixed frequency,
High location switch driving signal is sent to high location switch, realizes the control to the turn-on and turn-off of high location switch,
Low-side switch driving signal is sent to low-side switch, realizes the control to the turn-on and turn-off of low-side switch.
Preferably, first signal amplifies translation module, the signal at inspection leakage resistance both ends is received, just by current sample
The voltage difference of pole and current sample cathode carries out ratio enlargement and parallel moving of signal, generates and believes for the triangular wave of PWM modulation
Number.
Preferably, the second signal amplifies translation module, the signal at inspection leakage resistance both ends is received, carries out ratio enlargement
And parallel moving of signal, obtain real-time current signal.
Preferably, the ratio enlargement, refers to the ratio enlargement that multiple is greater than zero.
Preferably, the parallel moving of signal, shift value is including zero volt.
Preferably, the first signal amplification translation module and second signal amplification translation module common sparing or all electricity
Road.
Preferably, low-side switch is substituted using diode.
Preferably, real-time current signal at least through superposition slope compensation signal after sent again to mean value calculation module；
PWM modulation signal at least through superposition slope compensation signal after sent again to PWM comparator module.
Preferably, having additional loop compensation circuit on error amplifier block, PWM modulation signal passes through loop compensation
Processing.
Preferably, the first signal amplification translation module and second signal amplify translation module, the calculating of amplification factor
Principle are as follows:
If:
The amplification factor that first signal amplifies translation module is K1,
The amplification factor that second signal amplifies translation module is K2,
Expected feedback loop gain is ALOOP,
Error amplifier gain is AEA,
Default output electric current is ISET,
Examine leakage resistance resistance value RSEN,
Reference signal is VREF,
Then: the numerical value setting of K1 and K2 must meet following relationship:
Compared with prior art, technical solution of the present invention solves the problems, such as the matching of high location switch, only with one
Leakage resistance is examined, increase and the decrease in efficiency of cost are avoided, while also ensuring the precision of output electric current, is not in
Frequency does not know the problem of equal influences actual use.
Technical solution of the present invention realizes the BUCK rectifying conversion for having output Current Negative Three-Point Capacitance function, and then by negative
Feedback equalization realizes that inductance average current is constant, since inductance average current is equal to output electric current in BUCK framework,
Exactly realize constant output current；Circuit is simple and reliable, has relative to traditional constant current BUCK control circuit wider
Applicability, higher precision, better stability, and cheaper cost.
Detailed description of the invention
Fig. 1 is existing BUCK example one.
Fig. 2 is existing BUCK example two.
Fig. 3 is existing BUCK example three.
Fig. 4 is existing BUCK example four.
Fig. 5 is existing BUCK example five.
Fig. 6 changes schematic diagram with input supply voltage for electric current in example five.
Fig. 7 is existing BUCK example six.
Fig. 8 changes schematic diagram with input supply voltage for electric current in example six.
Fig. 9 is circuit module figure of the invention.
Specific embodiment
Below with reference to attached drawing, the invention will be further described.
As shown in figure 9, novel constant exports electric current BUCK circuit, that is, has the buck DC-DC line of constant current output function
Road circuit, that is, the constant current BUCK usually said, comprising:
Error amplifier block, for average current signal to be compared with reference signal, output PWM modulation signal,
The average current signal is inductance average current signal, and the inductance refers to inductor rectifier,
PWM comparator module, for PWM modulation signal to be compared with triangular signal, in triangular signal and PWM
Modulated signal voltage value reaches equivalent voltage at the time of point, exports the cut-off signals of high location switch,
Logic and driver circuit module are rectified, the cut-off signals of high location switch are received, is received from oscillator module
Clock signal, open signal of the clock signal as high location switch, exports high location switch driving signal and low-side switch is driven
Dynamic signal,
The clock signal is fixed frequency,
High location switch driving signal is sent to high location switch, realizes the control to the turn-on and turn-off of high location switch,
Low-side switch driving signal is sent to low-side switch, realizes the control to the turn-on and turn-off of low-side switch,
The high location switch connects input power anode and rectifier switch node,
The low-side switch connects input power cathode and rectifier switch node,
Diode can be used to substitute in low-side switch,
Further include:
Leakage resistance is examined, one and only one is connected to rectifier switch node after one end concatenation inductor rectifier, and the other end connects
Output cathode is connect,
Output capacitance, one end connect output cathode, and the other end connects output negative pole.
The present invention connects inspection leakage resistance between inductor rectifier and output capacitance, and inductor rectifier is connect with inspection leakage resistance
Node is current sample anode, and the node that inspection leakage resistance is connect with output capacitance is current sample cathode.
Based on the above technical solution, further includes:
First signal amplifies translation module, i.e., the signal in figure amplifies translation module 1, receives the letter at inspection leakage resistance both ends
Number, the voltage difference of current sample anode and current sample cathode is subjected to ratio enlargement and parallel moving of signal, generates and is used for PWM
The triangular signal of modulation.It obviously, also may include that various signals are reversed.
Based on the above technical solution, further includes:
Second signal amplifies translation module, i.e., the signal in figure amplifies translation module 2, receives the letter at inspection leakage resistance both ends
Number, ratio enlargement and parallel moving of signal are carried out, real-time current signal is obtained, real-time current signal is synchronous with inductive current holding same
Ratio variation,
Mean value calculation module receives the real-time current signal of second signal amplification translation module output, by average value
After calculating, the average current signal for embodying inductance average current value is obtained.It obviously, also may include that various signals are reversed, example
Such as: carry out during sample rate current various ratio enlargements or signal reversely belong to current sample line circuit implementation it is thin
Section, current average signal carry out various ratio enlargements or signal reversely belong to mean value calculation line circuit implementation it is thin
Section.
Based on the above technical solution, the ratio enlargement refers to the ratio enlargement that multiple is greater than zero.Cover each
Kind is not equal to zero scalar multiple.
Based on the above technical solution, the parallel moving of signal, shift value is including zero volt.
Based on the above technical solution, the first signal amplification translation module and second signal amplification translation module share
Some or all of circuit.
Based on the above technical solution, real-time current signal after superposition slope compensation signal at least through sending again to flat
Mean value computation module.
Based on the above technical solution, PWM modulation signal at least through superposition slope compensation signal after sent again to PWM
Comparator module.
Based on the above technical solution, loop compensation circuit is had additional on error amplifier block.
Based on the above technical solution, PWM modulation signal is handled by loop compensation.
Based on the above technical solution, further includes: defencive function module.Specific implementation can be by the prior art.
Based on the above technical solution, further includes: low-side switch zero current detecting circuit and corresponding low level are opened
Shutdown logic circuit.
Based on the above technical solution, the first signal amplification translation module and second signal amplify translation module,
The Computing Principle of amplification factor are as follows:
If:
The amplification factor that first signal amplifies translation module is K1,
The amplification factor that second signal amplifies translation module is K2,
Expected feedback loop gain is ALOOP,
Error amplifier gain is AEA,
Default output electric current is ISET,
Examine leakage resistance resistance value RSEN,
Reference signal is VREF,
Then: the numerical value setting of K1 and K2 must meet following relationship:
It can be with by the reckoning relationship that the first signal amplifies the amplification factor of translation module and second signal amplification translation module
Learn, it is contemplated that feedback loop gain:
Namely when the first signal amplifies amplification factor K1, K2 setting of translation module and second signal amplification translation module
For fixed value, error amplifier gain AEAWhen being also fixed value, loop gain ALOOPIt also is fixed value.This namely illustrate for
For the same circuit, the size and R of loop gain and predetermined currentSENValue it is unrelated so that predetermined current and
RSENValue can have very wide range.It is fabulous suitable that this feature has this novel constant output electric current BUCK circuit
The property used.
Compared with prior art, technical solution of the present invention solves the problems, such as the matching of high location switch, only with one
Leakage resistance is examined, increase and the decrease in efficiency of cost are avoided, while also ensuring the precision of output electric current, is not in
Frequency does not know the problem of equal influences actual use.
In the present invention:
1, since inductance average current is equal to output electric current in BUCK framework, it can be considered that embodying the average electricity of inductance
The signal of fluxion value is exactly the signal for embodying output current values.
2, when detecting that average current signal is higher relative to reference signal, that is, output electric current is inclined relative to preset value
Gao Shi, error amplifier block reduce the voltage value of PWM modulation signal, so that the triangular wave letter that PWM comparator module detects
Number reach at the time of that is equal to voltage point with PWM modulation signal to shift to an earlier date, so that the shutdown moment point of high location switch shifts to an earlier date.
Oscillator module exports the pulse of fixed frequency to control the start-up time of high location switch, it can be considered that high-order
Switching on the moment relative to each period is fixed.
Therefore it when high location switch shutdown moment point shifts to an earlier date, exactly shortens high location switch and is connected in each period
Time, that is, reduce the duty ratio of high location switch conducting, so that the time that inductive current rises is reduced, and decline
Time increases, and begins to decline inductive current relative to numerical value before, until average current signal drops to therewith
It is no longer above a reference value, that is, output electric current is no longer above preset value.
3, similarly, when detecting that average current signal is relatively low relative to reference signal, that is, output electric current is relative to pre-
If be worth relatively low, error amplifier block increase PWM modulation signal voltage value so that PWM comparator module detect three
Angle wave signal reaches at the time of that is equal to voltage point with PWM modulation signal and postpones, so that the shutdown moment point of high location switch is moved back
Afterwards.
Oscillator module exports the pulse of fixed frequency to control the start-up time of high location switch, it can be considered that high-order
Switching on the moment relative to each period is fixed.
Therefore it when high location switch shutdown moment point is stepped back, exactly extends high location switch and is connected in each period
Time, that is, the duty ratio of high location switch conducting is increased, so that the time that inductive current rises increases, and decline
Time is less, begins to ramp up inductive current relative to numerical value before, until average current signal drops to therewith
It is no longer below a reference value, that is, output electric current is no longer below preset value.
More than, the negative feedback control of output electric current is realized, so that output electric current is always held at preset value.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. novel constant exports electric current BUCK circuit characterized by comprising inspection leakage resistance, one and only one, one end string
It is connected to rectifier switch node after connecing inductor rectifier, the other end connects output cathode,
Output capacitance, one end connect output cathode, and the other end connects output negative pole,
High location switch connects input power anode and rectifier switch node,
Low-side switch connects input power cathode and rectifier switch node,
The node that inductor rectifier is connect with inspection leakage resistance is current sample anode, and the node that inspection leakage resistance is connect with output capacitance is
Current sample cathode,
First signal amplifies translation module, and input is connected with inspection leakage resistance both ends, receives the signal at inspection leakage resistance both ends, will be electric
The voltage difference of stream sampling anode and current sample cathode carries out ratio enlargement and parallel moving of signal, generates for PWM modulation
Triangular signal,
Second signal amplifies translation module, and input is connected with inspection leakage resistance both ends, receives the signal at inspection leakage resistance both ends, carries out
Ratio enlargement and parallel moving of signal generate real-time current signal,
Mean value calculation module receives the real-time current signal of second signal amplification translation module output, by mean value calculation
Later, obtain embodying the average current signal of inductance average current value,
Error amplifier block, for average current signal to be compared with reference signal, output PWM modulation signal is described
Average current signal is inductance average current signal, and the inductance refers to inductor rectifier,
PWM comparator module, for PWM modulation signal to be compared with triangular signal, in triangular signal and PWM modulation
Signal voltage value reaches equivalent voltage at the time of point, exports the cut-off signals of high location switch,
Logic and driver circuit module are rectified, the cut-off signals of high location switch are received, receives the clock from oscillator module
Signal, open signal of the clock signal as high location switch export high location switch driving signal and low-side switch driving letter
Number,
The clock signal is fixed frequency,
High location switch driving signal is sent to high location switch, realizes the control to the turn-on and turn-off of high location switch,
Low-side switch driving signal is sent to low-side switch, realizes the control to the turn-on and turn-off of low-side switch.
2. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that the ratio enlargement is
Refer to the ratio enlargement that multiple is greater than zero.
3. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that the parallel moving of signal is put down
Shifting value is including zero volt.
4. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that the amplification translation of the first signal
Module and second signal amplification translation module common sparing or whole circuits.
5. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that low-side switch uses two poles
Pipe substitutes.
6. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that real-time current signal is at least
It is sent again after being superimposed slope compensation signal to mean value calculation module；PWM modulation signal is at least through superposition slope compensation letter
It is sent again after number to PWM comparator module.
7. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that in error amplifier block
On have additional loop compensation circuit, PWM modulation signal is handled by loop compensation.
8. novel constant according to claim 1 exports electric current BUCK circuit, which is characterized in that the amplification translation of the first signal
Module and second signal amplify translation module, the Computing Principle of amplification factor are as follows:
If:
The amplification factor that first signal amplifies translation module is K1,
The amplification factor that second signal amplifies translation module is K2,
Expected feedback loop gain is ALOOP,
Error amplifier gain is AEA,
Default output electric current is ISET,
Examine leakage resistance resistance value RSEN,
Reference signal is VREF,
Then: the numerical value setting of K1 and K2 must meet following relationship:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339054.4A CN106961216B (en) | 2017-05-15 | 2017-05-15 | Novel constant exports electric current BUCK circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339054.4A CN106961216B (en) | 2017-05-15 | 2017-05-15 | Novel constant exports electric current BUCK circuit |
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| Publication Number | Publication Date |
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| CN106961216A CN106961216A (en) | 2017-07-18 |
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| CN110336461A (en) * | 2019-06-13 | 2019-10-15 | 无锡猎金半导体有限公司 | A kind of high efficiency BUCK synchronous commutating control circuit |
| CN111835095A (en) * | 2020-06-19 | 2020-10-27 | 华为技术有限公司 | Foreign matter detection device and wireless charging transmitting terminal equipment |
| CN113315380B (en) * | 2021-05-25 | 2022-09-02 | 上海晶丰明源半导体股份有限公司 | Switching power supply control circuit, system and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001103651A (en) * | 1999-09-29 | 2001-04-13 | Nec Corp | Variable overcurrent power unit |
| CN105634277A (en) * | 2016-02-14 | 2016-06-01 | 山东超越数控电子有限公司 | Power supply control method for improving transient state response performance of point-of-load power supply |
| CN105763052A (en) * | 2016-04-25 | 2016-07-13 | 北京大学 | Average current control circuit and average current control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001103651A (en) * | 1999-09-29 | 2001-04-13 | Nec Corp | Variable overcurrent power unit |
| CN105634277A (en) * | 2016-02-14 | 2016-06-01 | 山东超越数控电子有限公司 | Power supply control method for improving transient state response performance of point-of-load power supply |
| CN105763052A (en) * | 2016-04-25 | 2016-07-13 | 北京大学 | Average current control circuit and average current control method |
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Address after: 214115 c1-6f, China Sensor Network International Innovation Park, 200 Linghu Avenue, Wuxi City, Jiangsu Province Patentee after: Jiangsu Xintan Microelectronics Co.,Ltd. Address before: 214000 d307, Information Technology Industrial Park, No. 21, Changjiang Road, Wuxi City, Jiangsu Province Patentee before: WUXI LIEJIN SEMICONDUCTOR CO.,LTD. |
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Denomination of invention: A New Constant Output Current BUCK Circuit Effective date of registration: 20231205 Granted publication date: 20190507 Pledgee: Bank of Communications Ltd. Wuxi branch Pledgor: Jiangsu Xintan Microelectronics Co.,Ltd. Registration number: Y2023980069065 |