CN106357110A - BUCK constant-voltage driving circuit and BUCK constant-voltage driver - Google Patents
BUCK constant-voltage driving circuit and BUCK constant-voltage driver Download PDFInfo
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- CN106357110A CN106357110A CN201610852019.8A CN201610852019A CN106357110A CN 106357110 A CN106357110 A CN 106357110A CN 201610852019 A CN201610852019 A CN 201610852019A CN 106357110 A CN106357110 A CN 106357110A
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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
- H02M3/157—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 with digital control
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Abstract
The invention relates to a BUCK constant-voltage driving circuit and a BUCK constant-voltage driver. The BUCK constant-voltage driving circuit comprises a voltage output module, a control module, an overcurrent reference generation module, an overcurrent protection module, a constant-voltage control module, and a PWM (pulse width modulation) control module, wherein the control module is used for outputting a control signal to control the conduction and disconnection of a main switch tube in the voltage output module; the overcurrent reference generation module is used for obtaining the conduction time of the main switch tube according to the control signal, and compensating the overcurrent reference voltage of low input voltage; the overcurrent protection module is used for outputting a feedback signal to the control module according to the overcurrent reference voltage, and performing overcurrent protection on the voltage output module under the condition of loads; the constant-voltage control module is used for sampling output voltage, and outputting a constant-voltage adjusting signal according to the output voltage and the output reference voltage; the PWM control module is used for outputting the feedback signal to the control module according to the constant-voltage adjusting signal, adjusting the peak current in the voltage output module, and adjusting the output voltage into constant voltage. The BUCK constant-voltage driving circuit has the advantages that on the basis of maintaining low cost in the prior art, the high and low-voltage driving capacities are more approximated; under the condition of light load, the peak current can be decreased, and the light-load response and no-load power consumption characteristics are optimized.
Description
Technical field
The present invention relates to field of power electronics, more particularly, to a kind of buck constant voltage drive circuit and include this drive circuit
Buck constant-voltage driver.
Background technology
Typical case's application of prior art buck constant voltage drive circuit is as shown in Figure 1.Its operation principle is as follows: when clk produces
After device sends set signal, high pressure mos pipe m1 is opened by drive module, and high pressure mos pipe m1 turns on, and the electric current of inductance l will be with solid
Determine slope to increase, vcs voltage also increases therewith, when the electric current of inductance l increase to so that vcs with controller internal comparison voltage
When vref is equal, drive module will close mos pipe m1, be allowed to end, and now vs will drop quickly to-vd1, electric current on inductance l
Declined with fixed slope through diode d1, vout is powered to vcc by diode d2 simultaneously, then:
vl=vout+vd1=vcc+vd2(1)
It is assumed that vd1=vd2, then vcc=vout, therefore by vcc voltage, vout can be sampled, then through resistance
Obtain feedback voltage vfb after partial pressure, and be compared with internal reference voltage vref2.When output voltage vout is higher,
Vcc and vfb is also accordingly driven high, when vfb is higher than vref2, reset signal r1=1, and mos pipe m1 will close, and then vout will
Decline, vcc and vfb also accordingly declines, when vfb is less than vref2, reset signal r1=0, m1 will turn on again.Finally make vfb
Meansigma methodss and vref2 equal it is assumed that electric resistance partial pressure ratio be α, then:
vout=vcc=α * vref2(2)
The advantage of existing buck constant-voltage driver is: structure is simple, low cost.But there is obvious problem as follows:
1), inductance peak point current ipk is vref/rcs in theory, but the time delay due to comparator and mos turn off time delay
Exist, peak point current ipk is:
Wherein l is inductance sensibility reciprocal, and td is that comparator time delay turns off time delay sum with mos, due to vin " vout, (3) can letter
Turn to:
As can be seen from the above equation, peak point current increases with input voltage vin and increases, thus leading to during low input
Driving force is substantially weak than during high input voltage；
2), for bcm and dcm mode of operation, output with the relation of peak point current ipk and operating frequency f is:Because prior art does not reduce in the peak point current of underloading or even idle condition, therefore underloading frequency is too
Low, not only respond relatively slow and no-load power consumption is very big.
Content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, provides a kind of buck constant voltage to drive
Galvanic electricity road and buck constant-voltage driver.
The technical solution adopted for the present invention to solve the technical problems is: constructs a kind of buck constant voltage drive circuit, comprising:
For input voltage is adjusted to provide the voltage output module of constant voltage for load, to be used for output control signal to control
Make the control module being turned on and off of the main switch in described voltage output module, be used for being obtained according to described control signal
The information of the ON time of main switch and then acquisition input voltage simultaneously compensates to the excessively stream reference voltage of low input
Excessively stream benchmark generation module, for according to described excessively stream reference voltage output feed back signal to control module with to voltage output
Modular belt carries out the overcurrent protection module of overcurrent protection, for the defeated of the peripheral circuit mating with described drive circuit of sampling when carrying
Go out voltage and export the Isobarically Control module of constant voltage Regulate signal, be used for basis according to described output voltage and output reference voltage
Described constant voltage Regulate signal output feedback signal to control module with the peak point current in voltage output module is adjusted into
And adjust the pwm control module that described output voltage is constant voltage；
Described control module connect respectively described voltage output module, excessively stream benchmark generation module, overcurrent protection module,
Pwm control module, described overcurrent protection module is also connected with described excessively stream benchmark generation module, voltage output module, described constant voltage
Control module connects described pwm control module and described peripheral circuit, and described voltage output module is additionally coupled to peripheral circuit.
In buck constant voltage drive circuit of the present invention, described excessively stream benchmark generation module includes opening for the master that samples
Close the maximum integral voltage in each ON time and the maximum integral voltage in the constant time lag time and two maximums are amassed
Component voltage remains to the sampling hold circuit of master switch conducting next time and for producing according to two maximum integral voltages simultaneously
The excessively stream reference generator of excessively stream reference voltage, described overcurrent protection module includes first comparator；Described sampling hold circuit
Input link control module and outfan connect excessively stream reference generator input, described excessively stream reference generator defeated
Go out the positive input terminal that end connects first comparator, the negative input end of first comparator connects voltage output module, first comparator
Outfan link control module, wherein, described excessively stream reference generator is built with following relation:Its
In, a is normal number, and ton represents the ON time of master switch, and td represents the described constant time lag time, is first comparator time delay
Turn off time delay sum with master switch, vref represents described excessively stream reference voltage.
In buck constant voltage drive circuit of the present invention, described control signal forms high electricity within each clock cycle
Flat time span is a pwm signal of ton, and described sampling hold circuit includes: pulse generator, pwm signal generator, two
The charge switch turning on when individual N-shaped mos pipe, two electric capacity, two constant-current sources, two high level, described pulse generator is by institute
State a pwm signal rising edge triggering and produce pulse signal, described pwm signal generator is triggered by a pwm signal rising edge
Produce the 2nd pwm signal that high level time length is td；
Pulse generator, pwm signal generator are respectively connecting to described control module, and the drain electrode of each N-shaped mos pipe is all logical
Cross and be all connected with electric capacity, a source grounding, two N-shapeds between charge switch one constant-current source of connection, source electrode and drain electrode
The grid of mos pipe is connected to pulse generator, and the control end of a charge switch connects to pwm signal generator to receive
State a pwm signal, the control end of another charge switch connects to described control module to receive described 2nd pwm signal.
In buck constant voltage drive circuit of the present invention, described excessively stream reference generator includes: divider, multiplication
Device, two voltage followers, mos pipe mirror current source, first resistor, second resistances；
Two inputs of divider are respectively connecting to the drain electrode of two N-shaped mos pipes, and an input of multiplier receives
Constant a, another input connect the outfan of divider, and the input of first voltage follower is used for receiving the ginseng of a volt
Examine voltage, outfan connects the outfan of reference arm of mos pipe mirror current source and one end of first resistor, first resistor
The other end connects the outfan of second voltage follower, and the input of second voltage follower connects the output of multiplier
End, the outfan of the output branch road of mos pipe mirror current source connects the first end of second resistance, the second termination of second resistance
Ground, the first end of second resistance is additionally coupled to the positive input terminal of described first comparator.
In buck constant voltage drive circuit of the present invention, described Isobarically Control module includes bleeder circuit and error is put
Big device, described pwm control module includes the second comparator, and described bleeder circuit connects the negative defeated of peripheral circuit and error amplifier
Enter end, the positive input terminal of error amplifier is used for receiving output reference voltage, the outfan of described error amplifier connects second
The negative input end of comparator, the positive input terminal of the second comparator connects voltage output module, and the outfan of the second comparator connects
Control module.
In buck constant voltage drive circuit of the present invention, described Isobarically Control module also includes compensating resistance and compensation
Electric capacity, the outfan of error amplifier connects to voltage output module via described compensation resistance and compensating electric capacity.
In buck constant voltage drive circuit of the present invention, described voltage output module includes described main switch and inspection
Leakage resistance, described main switch is managed for N-shaped mos, and described control module includes clock generator, rs trigger, drive module, when
Clock generator connects the set end of rs trigger, two reset terminals of rs trigger connect respectively first comparator outfan and
The outfan of the second comparator, the outfan of rs trigger connects the input of drive module and the input of sampling hold circuit
End, the outfan of drive module connects the grid of N-shaped mos pipe, the input voltage outside drain electrode reception of N-shaped mos pipe, N-shaped mos
The source electrode of pipe connects the first of the negative input end of first comparator, the positive input terminal of the second comparator and inspection leakage resistance respectively
End, the second end of inspection leakage resistance connects to the outfan of error amplifier via described compensation resistance and compensating electric capacity.
The invention also discloses a kind of buck constant-voltage driver, it is packaged with described buck constant voltage in described driver and drives
Circuit.
Implement the buck constant voltage drive circuit of the present invention, have the advantages that on the one hand the present invention is in existing typical case
Increase excessively stream benchmark generation module on the basis of drive circuit, therefore compared with prior art, the excessively stream ginseng of overcurrent protection module
It is not unalterable for examining voltage, but through excessively stream benchmark generation module, the excessively stream reference voltage of low input is carried out
Compensate, on the basis of maintaining prior art advantage of low cost, so that high-low pressure driving force is more nearly；On the other hand, this
Bright Isobarically Control module and pwm control module coordinate the comparison substituting regulation output voltage in existing typical case's drive circuit jointly
The function of device, can be adjusted and then adjust according to constant voltage Regulate signal output voltage to peak point current, therefore remaining existing
On the basis of having technology advantage of low cost, peak point current can be fallen in underloading, thus optimizing underloading response and unloaded work(
Consumption characteristic.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the circuit diagram of typical case's application of prior art buck constant voltage drive circuit；
Fig. 2 is the circuit diagram of the application of buck constant voltage drive circuit of the present invention；
Fig. 3 is the circuit diagram of excessively stream benchmark generation module in Fig. 2；
Fig. 4 is the corresponding oscillogram of operation principle of sampling hold circuit.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail
The specific embodiment of the present invention.
As shown in Fig. 2 being the circuit diagram of the application of buck constant voltage drive circuit of the present invention.
The buck constant voltage drive circuit of the present invention includes: supply module, voltage output module 100, control module 200, mistake
Stream benchmark generation module 300, overcurrent protection module 400, Isobarically Control module 500, pwm control module 600.
Described control module 200 connects described voltage output module 100, excessively stream benchmark generation module 300, excessively stream guarantor respectively
Shield module 400, pwm control module 600, described overcurrent protection module 400 is also connected with described excessively stream benchmark generation module 300, electricity
Pressure output module 100, described Isobarically Control module 500 connects described pwm control module 600 and described peripheral circuit, described electricity
Pressure output module 100 is additionally coupled to peripheral circuit.
Supply module is used for starting whole drive circuit, voltage output module 100 be used for by input voltage be adjusted with
There is provided constant voltage for load；Control module 200 is used for output control signal to control the master in described voltage output module 100
Being turned on and off of switching tube；Excessively stream benchmark generation module 300 is used for obtaining the conducting of main switch according to described control signal
The information of time and then acquisition input voltage simultaneously compensates to the excessively stream reference voltage of low input；Overcurrent protection module
400 are used for feeding back signal to control module 200 to carry out to voltage output module 100 according to described excessively stream reference voltage output
Stream protection；Isobarically Control module 500 is used for the output voltage of peripheral circuit that mates with described drive circuit of sampling and according to institute
State output voltage and export constant voltage Regulate signal with output reference voltage；Pwm control module 600 is used for adjusting letter according to described constant voltage
Number output feedback signal is to control module 200 to be adjusted to the peak point current in voltage output module 100 and then to adjust institute
Stating output voltage is constant voltage.
Because the present invention increases excessively stream benchmark generation module on the basis of existing typical case's drive circuit, therefore with existing skill
Art is compared, and the excessively stream reference voltage of overcurrent protection module is not unalterable, but through excessively stream benchmark generation module pair
The excessively stream reference voltage of low input compensates, and on the basis of maintaining prior art advantage of low cost, so that high-low pressure is driven
Kinetic force is more nearly.And the Isobarically Control module of the present invention and pwm control module coordinate the existing typical case of replacement to drive jointly
Adjust the function of the comparator of output voltage in circuit, according to constant voltage Regulate signal, peak point current can be adjusted and then adjust
Whole output voltage, therefore on the basis of maintaining prior art advantage of low cost, can fall peak point current in underloading, from
And optimize underloading response and no-load power consumption characteristic.
In a specific embodiment, described voltage output module 100 includes described main switch and inspection leakage resistance
Rcs, described main switch is N-shaped mos pipe m1, and described control module 200 includes clock generator, rs trigger, drive module,
Apply this drive circuit when, need to connect corresponding peripheral circuit, peripheral circuit include fly-wheel diode d1, diode d2,
Electric capacity, inductance l.In Fig. 2 taking a driver encapsulating this drive circuit as a example, in figure vcc, vin, vs are the three of driver
Individual pin.Vin connects external power source as input pin, and specific is usually to connect a current rectifying and wave filtering circuit.Vs is as defeated
Go out pin and connect one end of inductance l and the negative pole of fly-wheel diode d1, the plus earth of fly-wheel diode d1, inductance l's is another
End, on the other hand connects via diode d2 via capacity earth as the voltage node of output voltage vout, this node one side
Driver connected vcc pin, the supply module of internal drive connects vin and vcc, for saving for vcc when starting for driver
Point provides voltage, and after driver life's work, supply module no longer will provide electric current for vcc.
Described excessively stream benchmark generation module 300 includes sampling hold circuit 310 and excessively stream reference generator 320, described mistake
Stream protection module 400 includes first comparator, and described Isobarically Control module 500 includes bleeder circuit 510 and error amplifier, institute
State pwm control module 600 and include the second comparator.
Clock generator connects the set end of rs trigger, and two reset terminals of rs trigger connect first comparator respectively
Outfan and the second comparator outfan, the outfan of rs trigger connects the input of drive module and sampling keeps electricity
The input on road 310, the outfan of sampling hold circuit 310 connects the input of excessively stream reference generator 320, described excessively stream base
The outfan of quasi- generator 320 connects the positive input terminal of first comparator, and the outfan of drive module connects N-shaped mos pipe m1's
Grid, the input voltage outside drain electrode reception of N-shaped mos pipe m1, the source electrode of N-shaped mos pipe m1 connects first comparator respectively
Negative input end, the positive input terminal of the second comparator and inspection leakage resistance rcs first end, inspection leakage resistance rcs the second end via
Described compensation resistance rc and compensating electric capacity cc connect to the outfan of error amplifier, and the outfan of described error amplifier also connects
Connect the negative input end of the second comparator, the positive input terminal of error amplifier is used for receiving output reference voltage, error amplifier
Negative input end connects the outfan of described bleeder circuit 510, and the input of described bleeder circuit 510 connects vcc node, i.e. periphery
The negative pole of diode d2 in circuit.
Bleeder circuit 510 can be common resistor voltage divider circuit, and resistor voltage divider circuit is the known circuits of this area, this
Place repeats no more.
Preferably, in the present embodiment, in order to ensure stability, described Isobarically Control module 500 also includes compensating resistance
Rc and compensating electric capacity cc, the outfan of error amplifier connects to inspection leakage resistance via described compensation resistance rc and compensating electric capacity cc
Second end of rcs.
On the one hand, the present invention solve underloading or unloaded when power consumption is high and the operation principle of the low problem of light-load efficiency such as
Under: when deviation in output voltage vout, the corresponding deviation of feedback voltage vfb of bleeder circuit 510 output, error amplifier is defeated
Constant voltage Regulate signal comp going out will adjust peak point current, thus adjusting inductive current, when system loop is stablized, vfb=
Vref2, thus realize the adjustment of output voltage.During underloading, loop will export constant voltage Regulate signal comp automatically, thus reducing peak
Value electric current.
On the other hand, in order to make up the driving force problem weaker than high input voltage during high low input, increase sampling
Holding circuit 310, excessively stream reference generator 320.Sampling hold circuit 310 is used for sampling in each ON time of master switch
Two maximum integral voltages are simultaneously remained to next by big integral voltage and the maximum integral voltage in the constant time lag time simultaneously
Secondary master switch conducting, excessively stream reference generator is used for producing excessively stream reference voltage according to two maximum integral voltages.Described control
Signal forms the pwm signal that high level time length is ton, because output voltage is constant, institute within each clock cycle
ON time (i.e. master switch ON time ton) with a pwm signal is negatively correlated with input voltage, believes a pwm for this
Number ON time is converted to integral voltage.
Wherein, described excessively stream reference generator 320 is built with following relation:Wherein, a is normal
Number, ton represents master switch ON time, and td represents described constant time lag time, generally first comparator time delay and master switch
Turn off time delay sum, vref represents described excessively stream reference voltage.
It is assumed that the ON time of upper a week is ton, then can obtain:
(5) are substituted into (4) of background section, then
Assume that td is fixing, because excessively stream reference generator 320 constructs as next relation:
Then (6) are changed into:
Contrast (4) and (8), it can be seen that the ipk of the present invention is unrelated with input voltage vin, can be very good to compensate low defeated
Enter the hypodynamic problem of voltage conditions driving energy.
The structure of the physical circuit with regard to over-sampling holding circuit 310 and excessively stream reference generator 320 provides a tool below
The example of body.
As Fig. 3, described sampling hold circuit 310 includes: (figure is not for pulse generator (not shown), pwm signal generator
Show), two N-shaped mos pipe mn1 and mn2, two electric capacity c1 and c2, two constant-current sources, two high level when the charge switch that turns on
K1 and k2, described pulse generator produces pulse signal by a described pwm signal rising edge triggering, and described pwm signal occurs
Device produces, by a pwm signal rising edge triggering, the 2nd pwm signal that high level time length is td.Wherein charge switch k1 and
K2 can be mos pipe or audion of N-shaped etc..
As Fig. 3, described excessively stream reference generator 320 includes: divider, multiplier, two voltage follower ea1 and ea2,
The mos pipe mirror current source that first resistor r1, second resistance r2, p-type mos pipe mp1 and mp2 are constituted, the source electrode of mp1 and mp2's
Source electrode connects internal electric source vdd, and the grid of mp1 connects the grid of mp2, and the grid of mp1 connects the drain electrode of mp1；
Pulse generator, pwm signal generator are respectively connecting to the outfan of rs trigger to receive a pwm signal,
The drain electrode of each N-shaped mos pipe is all by being all connected with an electricity between charge switch one constant-current source of connection, source electrode and drain electrode
Appearance, source grounding, the drain electrode of two N-shaped mos pipes is respectively connecting to two inputs of divider, the grid of two N-shaped mos pipes
Pole is connected to pulse generator, and the control end of charge switch k2 connects to described pwm signal generator to receive described second
Pwm signal, the control end of charge switch k1 connects to described rs trigger to receive a described pwm signal, and the one of multiplier
Individual input admiralty constant a, another input connect the outfan of divider, the input of first voltage follower ea1
For receiving the reference voltage of a volt, outfan (the i.e. leakage of mp1 of the reference arm of outfan connection mos pipe mirror current source
Pole) and first resistor r1 one end, the other end of first resistor r1 connects the outfan of second voltage follower ea2, second
The input of individual voltage follower ea2 connects the outfan of multiplier, the outfan of the output branch road of mos pipe mirror current source
(i.e. drain electrode of mp2) connects the first end of second resistance r2, the second end ground connection of second resistance r2, the first end of second resistance r2
It is additionally coupled to the positive input terminal of described first comparator.
In Fig. 3, in conjunction with Fig. 4, vrest1 and vrest2 represent pulse generator produce pulse signal, vrest1 and
Vrest2 is actually same pulse signal.
Due toOpen in main switch m1
During opening ton, charge switch k1 opens, and reference current ib charges to electric capacity c1, and integration generates voltage and isShould
Voltage remains to vrest1 when putting high.Vrest1 uprises, unlatching mn1, and clear to electric capacity c1 0.During main switch m1 turns off, charge
Switch k1 closes, and disconnects charging path.Meanwhile, in constant time lag time td, charge switch k2 opens, identical ib electric current pair
Electric capacity c2 charges, and integration generates voltage and isThis voltage remains to vrest2 when putting high.Vrest2 uprises, right
Electric capacity c2 clear 0.Two integral voltages, during keeping, obtain voltage through divider(size of c1 with c2 is identical).This
Signal and a constant obtain signal through a multiplierAmplifier ea2 is clampedMake it equal with vc voltage,
Amplifier ea1 clamped a point voltage is so as to equal with vd point voltage.The electric current flowing through mp1 is:Pmos manages
The mirroring ratios of mp1 and mp2 are 1；1, so the electric current flowing through mp2 is equal to the voltage produce on the electric current .r1 flowing through mp1 being (wherein: r1=r2).Using vr1 voltage as vref, then have:
Certainly, excessively stream reference generator is not limited to above circuit, can also realize above formula by internal processes
(7), these all should be within protection scope of the present invention.In addition, the model of the mos pipe that the present invention relates to is also not limited to
Shown in the present embodiment.
In sum, implement the buck constant voltage drive circuit of the present invention, have the advantages that on the one hand, the present invention
Increase excessively stream benchmark generation module, therefore compared with prior art, overcurrent protection mould on the basis of existing typical case's drive circuit
The excessively stream reference voltage of block is not unalterable, but through excessively stream benchmark generation module, the excessively stream of low input is joined
Examine voltage to compensate, on the basis of maintaining prior art advantage of low cost, so that high-low pressure driving force is more nearly；Another
Aspect, the Isobarically Control module of the present invention and pwm control module coordinate regulation output in replacement existing typical case drive circuit jointly
The function of the comparator of voltage, can be adjusted to peak point current according to constant voltage Regulate signal and then adjust output voltage, because
This, on the basis of maintaining prior art advantage of low cost, can fall peak point current in underloading, thus optimize underloading ringing
Should be with no-load power consumption characteristic.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned specific embodiment is only schematically, rather than restricted, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, also can make a lot
Form, these belong within the protection of the present invention.
Claims (8)
1. a kind of buck constant voltage drive circuit is it is characterised in that include: for being adjusted input voltage to provide for load
The voltage output module (100) of constant voltage, for output control signal to control the master in described voltage output module (100)
The control module (200) being turned on and off of switching tube, the ON time for obtaining main switch according to described control signal
And then obtain the information of input voltage the excessively stream benchmark generation module that the excessively stream reference voltage of low input is compensated
(300), it is used for feeding back signal to control module (200) with to voltage output module according to described excessively stream reference voltage output
(100) overcurrent protection module (400) with carrying out overcurrent protection when carrying, the periphery electricity mating with described drive circuit for sampling
The output voltage on road the Isobarically Control module according to described output voltage and output reference voltage output constant voltage Regulate signal
(500), it is used for according to described constant voltage Regulate signal output feedback signal to control module (200) with to voltage output module
(100) peak point current in is adjusted and then adjusts the pwm control module (600) that described output voltage is constant voltage；
Described control module (200) connects described voltage output module (100), excessively stream benchmark generation module (300), excessively stream respectively
Protection module (400), pwm control module (600), described overcurrent protection module (400) is also connected with described excessively stream benchmark and produces mould
Block (300), voltage output module (100), described Isobarically Control module (500) connects described pwm control module (600) and described
Peripheral circuit, described voltage output module (100) is additionally coupled to peripheral circuit.
2. buck constant voltage drive circuit according to claim 1 is it is characterised in that described excessively stream benchmark generation module
(300) include amassing for the maximum integral voltage in each ON time of master switch of sampling and the maximum in the constant time lag time
Two maximum integral voltages are simultaneously remained to the sampling hold circuit (310) of master switch conducting next time simultaneously and are used for by component voltage
Produce the excessively stream reference generator (320) of excessively stream reference voltage, described overcurrent protection module according to two maximum integral voltages
(400) include first comparator；The input link control module (200) of described sampling hold circuit (310) and outfan company
Take over the input of stream reference generator (320), the outfan of described excessively stream reference generator (320) connects first comparator
Positive input terminal, the negative input end of first comparator connects voltage output module (100), and the outfan of first comparator connects control
Module (200), wherein, described excessively stream reference generator (320) is built with following relation:Wherein, a is just
Constant, ton represents the ON time of master switch, and td represents the described constant time lag time, and vref represents described excessively stream reference voltage.
3. buck constant voltage drive circuit according to claim 2 is it is characterised in that described control signal is in each clock week
Form the pwm signal that high level time length is ton, described sampling hold circuit (310) includes: pulse generation in phase
The charge switch turning on when device, pwm signal generator, two N-shaped mos pipes, two electric capacity, two constant-current sources, two high level,
Described pulse generator produces pulse signal by a described pwm signal rising edge triggering, and described pwm signal generator is by described
First pwm signal rising edge triggering produces the 2nd pwm signal that high level time length is td；
Pulse generator, pwm signal generator are respectively connecting to described control module (200), and the drain electrode of each N-shaped mos pipe is equal
Connected by a charge switch and be all connected with electric capacity, a source grounding, two n between a constant-current source, source electrode and drain electrode
The grid of type mos pipe is connected to pulse generator, the control end of a charge switch connect to described pwm signal generator with
Receive described 2nd pwm signal, the control end of another charge switch connects to described control module to receive a described pwm
Signal.
4. buck constant voltage drive circuit according to claim 3 is it is characterised in that described excessively stream reference generator (320)
Including: divider, multiplier, two voltage followers, mos pipe mirror current source, first resistor (r1), second resistances (r2)；
Two inputs of divider are respectively connecting to the drain electrode of two N-shaped mos pipes, an input admiralty constant of multiplier
A, another input connect the outfan of divider, and the input of first voltage follower is used for receiving the reference electricity of a volt
Pressure, outfan connect the outfan of reference arm of mos pipe mirror current source and one end of first resistor (r1), first resistor
(r1) the other end connects the outfan of second voltage follower, and the input of second voltage follower connects multiplier
Outfan, the outfan of the output branch road of mos pipe mirror current source connects the first end of second resistance (r2), second resistance (r2)
The second end ground connection, the first end of second resistance (r2) is additionally coupled to the positive input terminal of described first comparator.
5. buck constant voltage drive circuit according to claim 2 is it is characterised in that described Isobarically Control module (500) is wrapped
Include bleeder circuit (510) and error amplifier, described pwm control module (600) includes the second comparator, described bleeder circuit
(510) connect the negative input end of peripheral circuit and error amplifier, the positive input terminal of error amplifier is used for receiving output reference
Voltage, the outfan of described error amplifier connects the negative input end of the second comparator, and the positive input terminal of the second comparator connects
Voltage output module (100), the outfan link control module (200) of the second comparator.
6. buck constant voltage drive circuit according to claim 5 is it is characterised in that described Isobarically Control module (500) is gone back
Including compensating resistance (rc) and compensating electric capacity (cc), the outfan of error amplifier via described compensation resistance (rc) and compensates electricity
Hold (cc) to connect to voltage output module (100).
7. buck constant voltage drive circuit according to claim 6 is it is characterised in that described voltage output module (100) is wrapped
Include described main switch and inspection leakage resistance (rcs), described main switch manages (m1) for N-shaped mos, described control module (200) bag
Include clock generator, rs trigger, drive module, clock generator connects the set end of rs trigger, two of rs trigger
Reset terminal connects the outfan of first comparator and the outfan of the second comparator respectively, and the outfan of rs trigger connects driving
The input of module and the input of sampling hold circuit (310), the outfan of drive module connects the grid of N-shaped mos pipe (m1)
Pole, the input voltage outside drain electrode reception of N-shaped mos pipe (m1), the source electrode of N-shaped mos pipe (m1) connects first comparator respectively
Negative input end, the positive input terminal of the second comparator and inspection leakage resistance (rcs) first end, inspection leakage resistance (rcs) second
End connects to the outfan of error amplifier via described compensation resistance (rc) and compensating electric capacity (cc).
8. a kind of buck constant-voltage driver is it is characterised in that encapsulation is just like the buck described in claim 1-7 in described driver
Constant voltage drive circuit.
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| CN201610852019.8A CN106357110B (en) | 2016-09-26 | 2016-09-26 | A kind of BUCK constant voltage drive circuits and BUCK constant-voltage drivers |
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| CN106357110B CN106357110B (en) | 2018-08-14 |
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| CN107623966A (en) * | 2017-09-27 | 2018-01-23 | 上海晶丰明源半导体股份有限公司 | Drive control circuit, drive control chip, driving control system and method |
| CN110601683A (en) * | 2019-08-19 | 2019-12-20 | 麦歌恩电子(上海)有限公司 | Switch control circuit and control method |
| CN111436171A (en) * | 2019-01-14 | 2020-07-21 | 新岸线(北京)科技集团有限公司 | L ED driver and output current precision correction method thereof |
| CN112072938A (en) * | 2020-09-14 | 2020-12-11 | 昂宝电子（上海）有限公司 | Apparatus and method for improving output voltage load regulation rate of switching power supply |
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| CN112072938A (en) * | 2020-09-14 | 2020-12-11 | 昂宝电子（上海）有限公司 | Apparatus and method for improving output voltage load regulation rate of switching power supply |
| CN112105124A (en) * | 2020-10-19 | 2020-12-18 | 美芯晟科技（北京）有限公司 | Loop type low-power constant current control circuit and method |
| CN112105124B (en) * | 2020-10-19 | 2023-09-08 | 美芯晟科技(北京)股份有限公司 | Loop type low-power-consumption constant-current control circuit and method |
| CN112398236A (en) * | 2021-01-20 | 2021-02-23 | 深圳赫兹创新技术有限公司 | Wireless charging system control method and device and wireless charging system |
| CN113110146A (en) * | 2021-03-30 | 2021-07-13 | 广州金升阳科技有限公司 | Driving power supply circuit and driving method thereof |
| CN113162511A (en) * | 2021-04-20 | 2021-07-23 | 江西省万佳通照明科技有限公司 | Broken wall machine integrated circuit |
| CN113193731A (en) * | 2021-04-22 | 2021-07-30 | 广州金升阳科技有限公司 | Current sampling compensation circuit of switching power supply |
| CN113193731B (en) * | 2021-04-22 | 2023-11-17 | 广州金升阳科技有限公司 | Current sampling compensation circuit of switching power supply |
| CN115694179A (en) * | 2021-07-21 | 2023-02-03 | 辉芒微电子(深圳)股份有限公司 | Buck constant voltage driver and application circuit thereof |
| CN115694179B (en) * | 2021-07-21 | 2023-11-21 | 辉芒微电子(深圳)股份有限公司 | Buck constant voltage driver and application circuit thereof |
| CN114944748B (en) * | 2022-07-20 | 2022-11-18 | 中科(深圳)无线半导体有限公司 | Constant frequency control circuit and method for constant on-time control mode converter |
| CN114944748A (en) * | 2022-07-20 | 2022-08-26 | 中科(深圳)无线半导体有限公司 | Constant frequency control circuit and method for constant on-time control mode converter |
| CN115296259A (en) * | 2022-09-27 | 2022-11-04 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
| CN115296259B (en) * | 2022-09-27 | 2022-12-20 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
| CN117729666A (en) * | 2023-12-08 | 2024-03-19 | 深圳市谐振电子有限公司 | Power supply control circuit for deep dimming and novel switching power supply device |
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Address after: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee after: Huimang Microelectronics (Shenzhen) Co.,Ltd. Address before: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee before: FREMONT MICRO DEVICES (SZ) Ltd. |