CN106059297A - DC (Direct Current) voltage conversion circuit - Google Patents
DC (Direct Current) voltage conversion circuit Download PDFInfo
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- CN106059297A CN106059297A CN201610417048.1A CN201610417048A CN106059297A CN 106059297 A CN106059297 A CN 106059297A CN 201610417048 A CN201610417048 A CN 201610417048A CN 106059297 A CN106059297 A CN 106059297A
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a DC (Direct Current) voltage conversion circuit which comprises a filtering circuit, a driving circuit and a control circuit, wherein the filtering circuit comprises a first inductor and a second inductor connected in series with the first inductor; the driving circuit is connected between the filtering circuit and the signal input end; the control circuit comprises a detection circuit, a comparison circuit and a switching element; the switching element is connected both ends of the second inductor; the detection circuit is connected with the signal output end and is used for detecting a current of the signal output end and outputting a detection voltage to the comparison circuit according to the current; and the comparison circuit is used for outputting a first control signal to the switching element to enable the switching element to be cut off after obtaining a result that the detection voltage is smaller than a reference voltage by comparison, so that the first inductor and the second inductor are positioned in a signal transmission loop between the signal input end and the signal output end to filter a pulse signal. According to the invention, the condition that the circuit can work in a continuous conduction mode under a light load condition is guaranteed, and stability of the circuit is improved.
Description
Technical field
The invention belongs to power technique fields, specifically, relate to a kind of DC voltage converting circuit.
Background technology
DC/DC transducer is effective electric pressure converter exporting fixed voltage after transformation input voltage.DC-DC converter
Being mainly characterized by power tube and be operated on off state, changer utilizes the energy storage characteristic of inductance element and capacity cell, along with merit
Rate pipe ceaselessly on, off, has the DC source of bigger voltage pulsation intermittently through switching tube, temporarily with magnetic energy form
It is stored in inductance part, after capacitor filtering, obtains continuous print ability and send load to, obtain the direct current that voltage pulsation is less
Power supply, thus realize DC-DC conversion.
In prior art, a lot of DC-DC circuit only just can be operated in continuous conduction mode (CCM) under fully loaded transportation condition,
When DC-DC circuit is operated in light-load mode, owing to the electric current of circuit reduces, when the electric current of inductance postpones one section after dropping to 0
Between switching tube just can turn on, cause circuit can not be operated in continuous conduction mode (CCM), can only operate in discontinuous conduction mode
(DCM), and easily there is peak current in the circuit being operated in interrupted discontinuous conduction mode (DCM), causes output signal the most at last
Ripple become big, the degradation of circuit.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the invention provides one and can work under the conditions of underloading
DC voltage converting circuit in continuous conduction mode.
The invention provides a kind of DC voltage converting circuit, comprising:
Filtering circuit, described filtering circuit includes the first inducer and the second inductance connected with described first inducer
Device, described first inducer and described second inducer are connected between signal input part and signal output part, and described signal is defeated
Entering to hold for receiving supplying DC voltage, described signal output part is used for output loading DC voltage；
Drive circuit, described drive circuit is connected between described filtering circuit and described signal input part, for by institute
State supplying DC voltage and be converted into pulse signal；
Control circuit, described control circuit includes testing circuit, comparison circuit and switch element, and described switch element connects
The two ends of described second inducer, described testing circuit connects described signal output part for detecting the electricity of described signal output part
Flow and according to described electric current output detections voltage to described comparison circuit, described comparison circuit is at more described detection voltage
Described switch element is made to end less than exporting the first control signal after the first reference voltage to described switch element, so that institute
State the first inducer and signal transmission that described second inducer is between described signal input part and described signal output part
Loop is filtered described pulse signal.
Further, described comparison circuit exports second after at more described detection voltage more than the first reference voltage
Control signal makes described switching elements conductive to described switch element so that described first inducer to be in described signal defeated
Enter and the signal transmission loop between end and described signal output part filters described pulse signal.
Further, described switch element includes input, outfan, control end, the input of described switch element, defeated
Going out end and be connected to the two ends of described second inducer, described control end connects described comparison circuit to receive described first control
Signal processed and described second control signal.
Further, described DC voltage converting circuit is provided with and is connected to described signal output part and described second inducer
Between the first node, described testing circuit includes light emitting diode, phototriode, the first resistance, the second resistance；Described
The positive pole of optical diode connects described first node, and the negative pole of described light emitting diode connects described signal output part, described light
The colelctor electrode of quick audion passes through described first resistance eutral grounding, and the emitter stage of described phototriode is by described second resistance even
Connecing power end, the colelctor electrode of described phototriode is also connected with described comparison circuit to export described detection voltage to described comparison
Circuit.
Further, described comparison circuit includes the first comparator, and the inverting input of described first comparator connects institute
Stating the colelctor electrode of phototriode, the normal phase input end of described first comparator is used for receiving described first reference voltage, described
The outfan described control end of connection of the first comparator is used for exporting described first control signal or described second and controls signal to
Described control end.
Further, described drive circuit includes connecting the switch module of described signal input part, connecting described switches set
The signal generator of part, the mu balanced circuit being connected between described signal generator and described first node；Described signal occurs
Device controls the conducting of described switch module for producing square-wave signal, thus described supplying DC voltage is converted into pulse letter
Number, described mu balanced circuit is for regulating the dutycycle of the square-wave signal of described signal generator, and then regulates described pulse signal
Stablize.
Further, described switch module includes PMOS and NMOS tube, and the grid of described PMOS connects described signal
Generator, the source electrode of described PMOS connects described signal input part, described DC voltage converting circuit be provided be connected to described
The second node between signal input part and described first inducer, the drain electrode of described PMOS connects described second node, institute
The grid stating NMOS tube connects described signal generator, and the drain electrode of described NMOS tube connects described second node, described NMOS tube
Source ground, described signal generator for send simultaneously described square-wave signal to described PMOS and NMOS tube grid with
Control the switch of described PMOS and NMOS tube.
Further, described mu balanced circuit includes connecting the second comparator of described signal generator, connecting described second
3rd comparator of the inverting input of comparator, RC circuit, amperometric, integrator, the 3rd resistance, the 4th resistance；
Described second node passes sequentially through described amperometric, the positive of described integrator described second comparator of connection
Input；The outfan of described 3rd comparator passes through described RC circuit ground；
Described first node connects the inverting input of described 3rd comparator, described 3rd ratio by described 3rd resistance
The inverting input of relatively device is also by described 4th resistance eutral grounding；
Described 3rd comparator is for by the voltage of the inverting input of described 3rd comparator and described 3rd comparator
The voltage of normal phase input end make comparisons acquisition voltage difference, described voltage difference exports to the most described through the filtration of described RC circuit
The inverting input of the second comparator, described amperometric is for detecting the electric current of described second node, and described integrator is used
In the current integration computing of described second node being obtained the voltage output normal phase input end to described second comparator, described the
Two comparators are for by the inverting input of the voltage of the normal phase input end of described second comparator and described second comparator
Voltage exports logic control signal and is used for according to described logic control to described signal generator, described signal generator after making comparisons
The dutycycle of square-wave signal described in Signal Regulation processed.
Further, described DC voltage converting circuit also includes connecting described control end and the selection of described integrator
Device, the first waveform generator connecting described selector and the second waveform generator, described integrator connects described selector, institute
State selector for receiving described first control signal and selecting described first waveform generator after voltage that integral operation obtains
Showing the waveform of the voltage that described integral operation obtains, described selector is used for receiving described second control signal and integral operation
The waveform of select described second waveform generator to show after the voltage obtained voltage that described integral operation obtains.
Further, described DC voltage converting circuit also includes the first electric capacity, and described first node passes through described first
Capacity earth.
Beneficial effects of the present invention: the DC voltage converting circuit that the present invention provides is by increasing control circuit to change electricity
The road control mode to inductance part, not only ensure that circuit can be operated in continuous conduction mode under the conditions of underloading, also reduces
The ripple coefficient of output signal, improves stability and the conversion efficiency of circuit.
Accompanying drawing explanation
By combining the following description that accompanying drawing is carried out, above and other aspect, feature and the advantage of embodiments of the invention
Will become clearer from, in accompanying drawing:
Fig. 1 is the module map of DC voltage converting circuit better embodiment of the present invention；
Fig. 2 is the circuit diagram of DC voltage converting circuit better embodiment of the present invention.
Detailed description of the invention
Hereinafter, with reference to the accompanying drawings to describe embodiments of the invention in detail.However, it is possible to come real in many different forms
Execute the present invention, and the present invention should not be construed as limited to the specific embodiment that illustrates here.On the contrary, it is provided that these are implemented
Example is to explain the principle of the present invention and actual application thereof, thus others skilled in the art are it will be appreciated that the present invention
Various embodiments and the various amendments being suitable for specific intended application.Identical label can be used in entire disclosure and accompanying drawing
Represent identical element.
Fig. 1 is the module map of DC voltage converting circuit better embodiment of the present invention；Fig. 2 is that DC voltage of the present invention turns
Change the circuit diagram of circuit better embodiment.
In conjunction with Fig. 1 and Fig. 2, DC voltage converting circuit 100 includes according to an embodiment of the invention: filtering circuit 10,
Described filtering circuit 10 includes the first inducer L11 and the second inducer L12 connected with the first inducer L11, described first
Inducer L11 and described second inducer L12 is connected between signal input part Vin and signal output part Vcore, described signal
Input Vin is used for receiving supplying DC voltage, and described signal output part Vcore is used for output loading DC voltage；
Drive circuit 20, described drive circuit 20 is connected between described filtering circuit 10 and described signal input part Vin,
For described supplying DC voltage is converted into pulse signal；
Control circuit 30, described control circuit 30 includes testing circuit 31, comparison circuit 32 and switch element 33, described in open
Closing the two ends that element 33 connects described second inducer L12, described testing circuit 31 connects described signal output part Vcore and is used for
Detect the electric current of described signal output part Vcore and according to described electric current output detections voltage to described comparison circuit 32, described
Comparison circuit 32 exports the first control signal to described switch element after at more described detection voltage less than reference voltage
33 and make described switch element 33 end, so that described first inducer L11 and described second inducer L12 are in described letter
Signal transmission loop number between input Vin and described signal output part Vcore filters described pulse signal.
Specifically, in the present embodiment, described comparison circuit 32 is for being more than reference voltage at more described detection voltage
Rear output the second control signal makes described switch element 33 turn on to described switch element 33, so that described first inducer
L11 is in the signal transmission loop between described signal input part Vin and described signal output part Vcore and filters described arteries and veins
Rush signal.
Described switch element 33 includes input 12, outfan 13, controls end 11, the input of described switch element 33
12, outfan 13 is connected to the two ends of described second inducer L12, described control end 11 connect described comparison circuit 32 with
Receive described first control signal and the second control signal.
In the present embodiment, described switch element 33 is specially MOS transistor, but the present invention is not restricted to this, described in open
Closing element 33 can also be audion.
Described testing circuit 31 includes photoelectrical coupler the 31, first resistance R1, the second resistance R2, described photoelectrical coupler 31
Including light emitting diode 311, phototriode 312.
Described DC voltage converting circuit 100 is provided with and is connected to described signal output part Vcore and described second inducer
The first node 101 between L12, the positive pole of described light emitting diode 311 connects described first node 101, described light-emitting diodes
The negative pole of pipe 311 connects described signal output part Vcore, and the colelctor electrode 1 of described phototriode 312 is by described first resistance
R1 ground connection, the emitter stage 2 of described phototriode 312 connects power end Vcc, described photosensitive three poles by described second resistance R2
The colelctor electrode 1 of pipe 312 is also connected with described comparison circuit 32 to export described detection voltage to described comparison circuit 32.Specifically,
Described light emitting diode 311 is luminous for the size according to described output loading DC voltage, and described phototriode 312 is used for
Luminance according to described light emitting diode 311 produces corresponding couple current, the colelctor electrode 1 of described phototriode 312
Produce the output of described detection voltage to described comparison circuit 32.
Described comparison circuit 32 includes that the first comparator 302, the normal phase input end 322 of described first comparator 302 are
One reference voltage input terminal, the inverting input 321 of described first comparator 302 connects the current collection of described phototriode 312
Pole 1 is for by electric with the first reference of described first comparator 302 after described detection voltage input extremely described first comparator 302
Pressure is made comparisons, and the outfan 323 (output1) of described first comparator 302 connects described control end 11 for exporting described
One control signal or described second controls signal to described control end 11.Here, specifically, described first control signal is concrete
For high level signal, described second control signal is specially low level signal.
It is to be understood that owing to, before receiving input signal, the electric current flowing through described light emitting diode 311 is 0, described
Light emitting diode 311 is not on-state, and phototriode 312 does not produce couple current.Now the of the first comparator 302
One reference voltage level Vref1More than the input voltage of described first comparator 302 input 321, the output of the first comparator 302
End 323 (output1) are high level, and described switch element 33 is cut-off state, and the inductance value that now filtering circuit 10 accesses is L
=L11+L12.It is to say, when original state, switch element 33 is cut-off state, described first inducer L11 and described
Second inducer L12 is connected between signal input part Vin and signal output part Vcore.
It should be noted that when system be operated in be continuously turned under conditions of time, the inductance value of system need to meet:
It is to say, the size of the inductance value in system directly determines the variable quantity of electric current in inductance.Inductance value is too small, electricity
Inducing current change can the most greatly, it is possible to causing the electric current on inductance for some time of each cycle is zero, and system enters discontinuously
Conduction mode (DCM) so that the ripple coefficient of output signal becomes big, the performance depreciation of system.
For the foregoing reasons, the when of in this example, it is assumed that system is operated under the conditions of underloading, signal output part
Output electric current corresponding for Vcore is to meet above-mentioned formula during I0, then when actual current size is I1, and I1 < I0, then luminous
The brightness of diode 311 reduces, and the couple current of phototriode 312 reduces, and the input voltage of the first comparator 302 reduces,
The most described first reference voltage level Vref1More than the magnitude of voltage of the input 321 of described first comparator 302, the most described first
The outfan 323 (output1) of comparator 302 is output as high level, say, that described switch element 33 (MOS transistor)
Controlling pole (grid) is high level, and the most described switch element 33 (MOS transistor) is cut-off state, described first inducer
L11, the second inducer L12 access filter circuit, inductance value L=L11+L12 that filtering circuit 10 accesses；When actual current size
During for I1, and I1 > I0, then the brightness of light emitting diode 311 increases, and the couple current that phototriode 312 produces increases, and first
The input voltage of the input 321 of comparator 302 increases, as described first reference voltage level Vref1Less than described first comparator
The magnitude of voltage of the input 321 of 302, the outfan 323 (output1) of the most described first comparator 302 is output as low level, also
That is the control pole (grid) of described switch element 33 (MOS transistor) is low level, the most described switch element 33 (MOS
Transistor) it is conducting state, described second inducer L12 is shorted, and the only first inducer L11 accesses filtering circuit 10, mistake
Inductance value L=L11 that filter circuit 10 accesses.
Described drive circuit 20 includes connecting the switch module 21 of described signal input part Vin, connecting described switch module
The signal generator 22 of 21, the voltage stabilizing being connected between the outfan of described signal generator 22 and described second inducer L12
Circuit 23 (the non-label of Fig. 2)；Described signal generator 22 produces square-wave signal and controls the conducting of described switch module 21, thus will
Described supplying DC voltage is converted into pulse signal, and described mu balanced circuit 23 is for regulating the square wave letter of described signal generator 22
Number dutycycle, and then regulate stablizing of described pulse signal.
Described DC voltage converting circuit 100 is provided with and is connected to described signal input part Vin and described first inducer L11
Between the second node 102.Described switch module 21 includes PMOS T1 and NMOS tube T2, and the grid of described PMOS T1 connects
Described signal generator 22, the source electrode of described PMOS T1 connects described signal input part Vin, and the drain electrode of described PMOS T1 is even
Connecing described second node 102, the grid of described NMOS tube T2 connects described signal generator 22, and the drain electrode of described NMOS tube T2 is even
Connecing described second node 102, the source ground of described NMOS tube T2, described signal generator 22 sends described square-wave signal simultaneously
Extremely the grid of described PMOS T1 and NMOS tube T2 is to control described PMOS T1 and the switch of NMOS tube T2.
Described mu balanced circuit 23 includes the second comparator 24 being connected with described signal generator 22, connects described second ratio
3rd comparator 25 of relatively device 24, amperometric 26, integrator 27, RC circuit the 28, the 3rd resistance R3, the 4th resistance R4.
Specifically, described second node 102 passes sequentially through amperometric 26, integrator 27 connects described second comparator
The normal phase input end 242 of 24, the outfan 253 of described 3rd comparator 25 is by described RC circuit 28 ground connection.Described first knot
Point 101 connects the inverting inputs 251 of described 3rd comparator 25, described 3rd comparator 25 anti-phase by the 3rd resistance R3
Input 251 is also by described 4th resistance R4 ground connection, and the normal phase input end 252 of described 3rd comparator 25 is for receiving the 3rd
Reference voltage Vref3, the outfan 253 of described 3rd comparator 25 connects the inverting input 241 of described second comparator 24,
The outfan 243 of described second comparator 24 connects described signal generator 22.
More specifically, described 3rd comparator 25 is for the electricity by the inverting input 251 of described 3rd comparator 25
The 3rd reference voltage V that the normal phase input end 252 of pressure and described 3rd comparator 25 receivesref3Make comparisons acquisition voltage difference,
Described voltage difference is through the inverting input 321 filtering output extremely described second comparator 24 of described RC circuit 28, described electricity
Current sensor 26 is for detecting the electric current of described second node 102, and described integrator 27 is for the electricity to described second node 102
The normal phase input end 242 of voltage output extremely described second comparator 24, specifically, the second comparator 24 is obtained after stream integral operation
Normal phase input end 242 receive voltage that this integral operation obtains the second reference voltage as described second comparator 24
Vref2, described second comparator 24 is for the voltage described integral operation obtained and the anti-phase input of described second comparator 24
The voltage of end 241 exports logic control signal and is used for root to described signal generator 22, described signal generator 22 after making comparisons
The dutycycle of described square-wave signal is regulated according to described logic control signal.
Specifically, described RC circuit 28 specifically includes the 5th resistance of the outfan 252 connecting described 3rd comparator 25
R5, connects the second electric capacity C2 of described 5th resistance R5, and specifically, described 5th resistance R5 is connect by described second electric capacity C2
Ground.
Specifically, described DC voltage converting circuit 100 also includes that the first electric capacity C1, described first node 101 pass through institute
State the first electric capacity C1 ground connection.Described DC voltage converting circuit 100 also includes connecting described control end 11 and described integrator 27
Selector 41, the first waveform generator 42 connecting described selector 41 and the second waveform generator 43.Described integrator 27
After the current integration computing to described second node 102, output voltage is to described selector 41, and described selector 41 is used for
Receive described first control signal and select first waveform generator 42 to show after voltage that described integral operation obtains described long-pending
The waveform of the voltage that partite transport obtains, described selector 41 is for the electricity receiving described second control signal and integral operation obtains
The waveform of select the second waveform generator 43 to show after pressure voltage that described integral operation obtains.
In sum, the DC voltage converting circuit of embodiments of the invention connects to change circuit by increasing control circuit
Entering the control mode of inductance part, the system that not only ensure that can be operated in continuous conduction mode under the conditions of underloading, also reduces
The ripple coefficient of output signal, improves stability and the conversion efficiency of system.
It should be noted that in this article, the relational terms of such as first and second or the like is used merely to a reality
Body or operation separate with another entity or operating space, and deposit between not necessarily requiring or imply these entities or operating
Relation or order in any this reality.And, term " includes ", " comprising " or its any other variant are intended to
Comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Including process, method, article or the equipment of described key element there is also other identical element.
Although illustrate and describing the present invention with reference to specific embodiment, but it should be appreciated by those skilled in the art that:
In the case of without departing from the spirit and scope of the present invention limited by claim and equivalent thereof, can carry out at this form and
Various changes in details.
Claims (10)
1. a DC voltage converting circuit, it is characterised in that including:
Filtering circuit, described filtering circuit includes the first inducer and the second inducer connected with described first inducer, institute
Stating the first inducer and described second inducer is connected between signal input part and signal output part, described signal input part is used
In receiving supplying DC voltage, described signal output part is used for output loading DC voltage；
Drive circuit, described drive circuit is connected between described filtering circuit and described signal input part, for by described confession
Direct current electric pressure is converted into pulse signal；
Control circuit, described control circuit includes testing circuit, comparison circuit and switch element, and described switch element connects described
The two ends of the second inducer, described testing circuit connects described signal output part for detecting the electric current of described signal output part also
According to described electric current output detections voltage to described comparison circuit, described comparison circuit is for being less than at more described detection voltage
Exporting the first control signal after first reference voltage makes described switch element end to described switch element, so that described the
One inducer and described second inducer are in the signal transmission loop between described signal input part and described signal output part
In and filter described pulse signal.
DC voltage converting circuit the most according to claim 1, it is characterised in that described comparison circuit is for comparing
Stating detection voltage makes described switch element lead more than exporting the second control signal after the first reference voltage to described switch element
It is logical, so that described first inducer is in the signal transmission loop between described signal input part and described signal output part
And filter described pulse signal.
DC voltage converting circuit the most according to claim 2, it is characterised in that described switch element include input,
Outfan, control end, the input of described switch element, outfan are connected to the two ends of described second inducer, described
Control end and connect described comparison circuit to receive described first control signal and described second control signal.
DC voltage converting circuit the most according to claim 3, it is characterised in that described DC voltage converting circuit is provided with
Being connected to the first node between described signal output part and described second inducer, described testing circuit includes light-emitting diodes
Pipe, phototriode, the first resistance, the second resistance；The positive pole of described light emitting diode connects described first node, described luminescence
The negative pole of diode connects described signal output part, and the colelctor electrode of described phototriode passes through described first resistance eutral grounding, institute
The emitter stage stating phototriode connects power end by described second resistance, and the colelctor electrode of described phototriode is also connected with institute
State comparison circuit to export described detection voltage to described comparison circuit.
DC voltage converting circuit the most according to claim 4, it is characterised in that described comparison circuit includes that first compares
Device, the inverting input of described first comparator connects the colelctor electrode of described phototriode, the positive of described first comparator
Input is used for receiving described first reference voltage, and the outfan of described first comparator connects described control end and is used for exporting institute
State the first control signal or described second and control signal to described control end.
DC voltage converting circuit the most according to claim 5, it is characterised in that described drive circuit includes that connection is described
The switch module of signal input part, connect the signal generator of described switch module, be connected to described signal generator with described
Mu balanced circuit between first node；Described signal generator controls the conducting of described switch module for producing square-wave signal,
Thus described supplying DC voltage is converted into pulse signal, described mu balanced circuit is for regulating the square wave of described signal generator
The dutycycle of signal, and then regulate stablizing of described pulse signal.
DC voltage converting circuit the most according to claim 6, it is characterised in that described switch module include PMOS and
NMOS tube, the grid of described PMOS connects described signal generator, and the source electrode of described PMOS connects described signal input part,
Described DC voltage converting circuit is provided with the second node being connected between described signal input part and described first inducer, institute
The drain electrode stating PMOS connects described second node, and the grid of described NMOS tube connects described signal generator, described NMOS tube
Drain electrode connect described second node, the source ground of described NMOS tube, described signal generator is for sending described side simultaneously
The grid of ripple signal extremely described PMOS and NMOS tube is to control described PMOS and the switch of NMOS tube.
DC voltage converting circuit the most according to claim 7, it is characterised in that described mu balanced circuit includes that connection is described
Second comparator of signal generator, connect the 3rd comparator of the inverting input of described second comparator, RC circuit, electric current
Detector, integrator, the 3rd resistance, the 4th resistance；
Described second node passes sequentially through described amperometric, the positive input of described integrator described second comparator of connection
End；The outfan of described 3rd comparator passes through described RC circuit ground；
Described first node connects the inverting input of described 3rd comparator, described 3rd comparator by described 3rd resistance
Inverting input also by described 4th resistance eutral grounding；
Described 3rd comparator is for by the voltage of the inverting input of described 3rd comparator with described 3rd comparator just
The voltage of phase input is made comparisons acquisition voltage difference, and described voltage difference exports to described second through the filtration of described RC circuit
The inverting input of comparator, described amperometric is for detecting the electric current of described second node, and described integrator is for right
The current integration computing of described second node obtains the normal phase input end of voltage output extremely described second comparator, described second ratio
Relatively device is for the voltage by the voltage of the normal phase input end of described second comparator with the inverting input of described second comparator
After making comparisons, output logic control signal gives described signal generator, and described signal generator is for believing according to described logic control
Number regulate described square-wave signal dutycycle.
DC voltage converting circuit the most according to claim 8, it is characterised in that described DC voltage converting circuit also wraps
Include the described control end of connection and the selector of described integrator, the first waveform generator connecting described selector and the second waveform
Generator, described integrator connects described selector, and described selector is used for receiving described first control signal and integral operation
The waveform of select described first waveform generator to show after the voltage obtained voltage that described integral operation obtains, described selector
Described for receiving described second control signal and selecting described second waveform generator to show after voltage that integral operation obtains
The waveform of the voltage that integral operation obtains.
10. according to the DC voltage converting circuit described in any one of claim 6 to 9, it is characterised in that described DC voltage turns
Changing circuit and also include the first electric capacity, described first node passes through described first capacity earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417048.1A CN106059297B (en) | 2016-06-12 | 2016-06-12 | DC voltage converting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417048.1A CN106059297B (en) | 2016-06-12 | 2016-06-12 | DC voltage converting circuit |
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| CN106059297A true CN106059297A (en) | 2016-10-26 |
| CN106059297B CN106059297B (en) | 2019-05-21 |
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| CN201610417048.1A Active CN106059297B (en) | 2016-06-12 | 2016-06-12 | DC voltage converting circuit |
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| CN106059297B (en) | 2019-05-21 |
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