CN106059297B - DC voltage converting circuit - Google Patents
DC voltage converting circuit Download PDFInfo
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- CN106059297B CN106059297B CN201610417048.1A CN201610417048A CN106059297B CN 106059297 B CN106059297 B CN 106059297B CN 201610417048 A CN201610417048 A CN 201610417048A CN 106059297 B CN106059297 B CN 106059297B
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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 present invention provides a kind of DC voltage converting circuits comprising: filtering circuit, the filtering circuit include the first inductor and with concatenated second inductor of the first inductor；Driving circuit, the driving circuit are connected between filtering circuit and signal input part；Control circuit, the control circuit includes detection circuit, comparison circuit and switch element, the switch element connects the both ends of the second inductor, the detection circuit connection signal output end is used to detect the electric current of signal output end and exports detection voltage to comparison circuit according to electric current, the comparison circuit, which is used to export first control signal after the detection voltage is less than reference voltage, ends switch element to switch element, the pulse signal is filtered in signal transmission loop to make the first inductor and the second inductor be between signal input part and signal output end.This invention ensures that circuit can work under the conditions of underloading in continuous conduction mode, the stability of circuit is improved.
Description
Technical field
The invention belongs to power technique fields, in particular, being related to a kind of DC voltage converting circuit.
Background technique
DC/DC converter is the electric pressure converter that fixed voltage is effectively exported after changing input voltage.DC-DC converter
Power tube work is mainly characterized by switch state, converter utilizes the energy storage characteristic of inductance element and capacity cell, with function
Rate pipe ceaselessly on, off, the DC power supply with larger voltage fluctuation intermittently passes through switching tube, temporarily in the form of magnetic energy
It is stored in inductance part, continuous ability is obtained after capacitor filtering and sends load to, obtain the lesser direct current of voltage fluctuation
Power supply, to realize that DC-DC is converted.
In the prior art, many DC-DC circuits could be only worked under fully loaded transportation condition at continuous conduction mode (CCM),
When DC-DC circuit work is in light-load mode, since the electric current of circuit reduces, when the electric current of inductance postpones one section after dropping to 0
Between switching tube can just be connected, cause circuit that cannot work at continuous conduction mode (CCM), can only operate in discontinuous conduction mode
(DCM), it works and is easy to appear peak current in the circuit of interrupted discontinuous conduction mode (DCM), finally will lead to output signal
Ripple become larger, the degradation of circuit.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the present invention provides one kind can work under the conditions of underloading
In the DC voltage converting circuit of continuous conduction mode.
The present invention provides a kind of DC voltage converting circuits comprising:
Filtering circuit, the filtering circuit include the first inductor and with concatenated second inductance of first inductor
Device, first inductor and second inductor are connected between signal input part and signal output end, and the signal is defeated
Enter end and is used for output loading DC voltage for receiving supplying DC voltage, the signal output end；
Driving circuit, the driving circuit are connected between the filtering circuit and the signal input part, are used for institute
It states supplying DC voltage and is converted into pulse signal；
Control circuit, the control circuit include detection circuit, comparison circuit and switch element, the switch element connection
The both ends of second inductor, the detection circuit connect the signal output end for detecting the electricity of the signal output end
It flows and detection voltage is exported to the comparison circuit according to the electric current, the comparison circuit is used in the detection voltage
End the switch element to the switch element less than first control signal is exported after the first reference voltage, to make institute
The signal that the first inductor and second inductor are between the signal input part and the signal output end is stated to transmit
The pulse signal is filtered in circuit.
Further, the comparison circuit is used to export second after the detection voltage is greater than the first reference voltage
Control signal makes the switching elements conductive to the switch element, so that it is defeated so that first inductor is in the signal
Enter in the signal transmission loop between end and the signal output end and filters the pulse signal.
Further, the switch element includes input, output end, control terminal, the input terminal of the switch element, defeated
Outlet is connected to the both ends of second inductor, and the control terminal connects the comparison circuit to receive first control
Signal processed and the second control signal.
Further, the DC voltage converting circuit is equipped with and is connected to the signal output end and second inductor
Between the first node, the detection circuit includes light emitting diode, phototriode, first resistor, second resistance；The hair
The anode of optical diode connects first node, and the cathode of the light emitting diode connects the signal output end, the light
The collector of quick triode is grounded by the first resistor, and the emitter of the phototriode is connected by the second resistance
Power end is connect, the collector of the phototriode is also connected with the comparison circuit to export the detection voltage to the comparison
Circuit.
Further, the comparison circuit includes first comparator, and the inverting input terminal of the first comparator connects institute
The collector of phototriode is stated, the normal phase input end of the first comparator is described for receiving first reference voltage
The output end of first comparator connects the control terminal for exporting the first control signal or the second control signal extremely
The control terminal.
Further, the driving circuit includes the switch block for connecting the signal input part, the connection switching group
The signal generator of part, the voltage regulator circuit being connected between the signal generator and first node；The signal occurs
Device is for generating the conducting that square-wave signal controls the switch block, so that the supplying DC voltage is converted into pulse letter
Number, the voltage regulator circuit is used to adjust the duty ratio of the square-wave signal of the signal generator, and then adjusts the pulse signal
Stabilization.
Further, the switch block includes PMOS tube and NMOS tube, and the grid of the PMOS tube connects the signal
Generator, the source electrode of the PMOS tube connect the signal input part, and the DC voltage converting circuit is described equipped with being connected to
The drain electrode of the second node between signal input part and first inductor, the PMOS tube connects second node, institute
The grid for stating NMOS tube connects the signal generator, and the drain electrode of the NMOS tube connects second node, the NMOS tube
Source electrode ground connection, the signal generator be used for and meanwhile send the square-wave signal to the grid of the PMOS tube and NMOS tube with
Control the switch of the PMOS tube and NMOS tube.
Further, the voltage regulator circuit includes the second comparator for connecting the signal generator, connection described second
Third comparator, RC circuit, current detector, integrator, 3rd resistor, the 4th resistance of the inverting input terminal of comparator；
Second node passes sequentially through the current detector, the integrator connects the positive of second comparator
Input terminal；The output end of the third comparator passes through the RC circuit ground；
First node connects the inverting input terminal of the third comparator, the third ratio by the 3rd resistor
Also pass through the 4th resistance eutral grounding compared with the inverting input terminal of device；
The third comparator is used for the voltage of the inverting input terminal of the third comparator and the third comparator
The voltage of normal phase input end make comparisons and obtain voltage difference, the voltage difference is exported through the filtering of the RC circuit to described
The inverting input terminal of second comparator, the current detector are used to detect the electric current of second node, and the integrator is used
The normal phase input end of voltage output to second comparator is obtained in the current integration operation to second node, described
Two comparators are used for the inverting input terminal of the voltage of the normal phase input end of second comparator and second comparator
Voltage exports logic control signal to the signal generator after making comparisons, the signal generator is used for according to the logic control
The duty ratio of square-wave signal described in Signal Regulation processed.
Further, the DC voltage converting circuit further includes the selection for connecting the control terminal and the integrator
The first waveform generator and the second waveform generator of device, the connection selector, the integrator connect the selector, institute
The first waveform generator is selected after stating the voltage that selector is used to receive the first control signal and integral operation obtains
Show the waveform for the voltage that the integral operation obtains, the selector is for receiving the second control signal and integral operation
The waveform for the voltage for selecting second waveform generator to show that the integral operation obtains after obtained voltage.
Further, the DC voltage converting circuit further includes first capacitor, and first node passes through described first
Capacity earth.
Beneficial effects of the present invention: DC voltage converting circuit provided by the invention is by increasing control circuit to change electricity
Road not only ensure that circuit can work under the conditions of underloading in continuous conduction mode, also reduce to the control mode of inductance part
The ripple coefficient of output signal, improves the stability and transfer efficiency of circuit.
Detailed description of the invention
What is carried out in conjunction with the accompanying drawings is described below, above and other aspect, features and advantages of the embodiment of the present invention
It will become clearer, in attached 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.
Specific embodiment
Hereinafter, with reference to the accompanying drawings to detailed description of the present invention embodiment.However, it is possible to come in many different forms real
The present invention is applied, and the present invention should not be construed as limited to the specific embodiment illustrated here.On the contrary, providing these implementations
Example is in order to explain the principle of the present invention and its practical application, so that others skilled in the art are it will be appreciated that of the invention
Various embodiments and the various modifications for being suitable for specific intended application.Identical label can be used in the whole instruction and attached drawing
Indicate 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.
The DC voltage converting circuit 100 of embodiment according to the present invention includes: filtering circuit 10 combined with Figure 1 and Figure 2,
The filtering circuit 10 include the first inductor L11 and with the concatenated second inductor L12 of the first inductor L11, described first
Inductor L11 and the second inductor L12 are connected between signal input part Vin and signal output end Vcore, the signal
Input terminal Vin is used for output loading DC voltage for receiving supplying DC voltage, the signal output end Vcore；
Driving circuit 20, the driving circuit 20 are connected between the filtering circuit 10 and the signal input part Vin,
For the supplying DC voltage to be converted into pulse signal；
Control circuit 30, the control circuit 30 includes detection circuit 31, comparison circuit 32 and switch element 33, described to open
The both ends that element 33 connects the second inductor L12 are closed, the detection circuit 31 connects the signal output end Vcore and is used for
Detect the electric current of the signal output end Vcore and according to electric current output detection voltage to the comparison circuit 32, it is described
Comparison circuit 32 is used to after the detection voltage is less than reference voltage export first control signal to the switch element
33 and end the switch element 33, so that the first inductor L11 and the second inductor L12 be made to be in the letter
In signal transmission loop number between input terminal Vin and the signal output end Vcore and filter the pulse signal.
Specifically, in the present embodiment, the comparison circuit 32 is used to be greater than reference voltage in the detection voltage
Exporting second control signal afterwards is connected the switch element 33 to the switch element 33, to make first inductor
The arteries and veins is filtered in the signal transmission loop that L11 is between the signal input part Vin and the signal output end Vcore
Rush signal.
The switch element 33 includes input terminal 12, output end 13, control terminal 11, the input terminal of the switch element 33
12, output end 13 is connected to the both ends of the second inductor L12, the control terminal 11 connect the comparison circuit 32 with
Receive the first control signal and second control signal.
In the present embodiment, the switch element 33 is specially MOS transistor, but the present invention is not restricted to this, described to open
Close element 33 or triode.
The detection circuit 31 includes photoelectrical coupler 31, first resistor R1, second resistance R2, the photoelectrical coupler 31
Including light emitting diode 311, phototriode 312.
The DC voltage converting circuit 100 is equipped with and is connected to the signal output end Vcore and second inductor
The anode of the first node 101 between L12, the light emitting diode 311 connects first node 101, the light-emitting diodes
The cathode of pipe 311 connects the signal output end Vcore, and the collector 1 of the phototriode 312 passes through the first resistor
R1 ground connection, the emitter 2 of the phototriode 312 pass through the second resistance R2 connection power end Vcc, photosensitive three pole
The collector 1 of pipe 312 is also connected with the comparison circuit 32 to export the detection voltage to the comparison circuit 32.Specifically,
The light emitting diode 311 is used to be shone according to the size of the output loading DC voltage, and the phototriode 312 is used for
Corresponding couple current, the collector 1 of the phototriode 312 are generated according to the luminance of the light emitting diode 311
The detection voltage output is generated to the comparison circuit 32.
The comparison circuit 32 includes first comparator 302, and the normal phase input end 322 of the first comparator 302 is the
One reference voltage input terminal, the inverting input terminal 321 of the first comparator 302 connect the current collection of the phototriode 312
Pole 1 is used for the first reference electricity after the detection voltage input to the first comparator 302 with the first comparator 302
Pressure is made comparisons, and the output end 323 (output1) of the first comparator 302 connects the control terminal 11 for exporting described the
One controls signal or the second control signal to the control terminal 11.Herein, specifically, the first control signal is specific
For high level signal, the second control signal is specially low level signal.
It is to be understood that the electric current for flowing through the light emitting diode 311 is 0, described due to before receiving input signal
Light emitting diode 311 is not on-state, and phototriode 312 does not generate couple current.The of first comparator 302 at this time
One reference voltage value Vref1Greater than the input voltage of 302 input terminal 321 of first comparator, the output of first comparator 302
323 (output1) of end are high level, and the switch element 33 is off state, and the inductance value that filtering circuit 10 accesses at this time is L
=L11+L12.That is, in the initial state, switch element 33 is off state, the first inductor L11 and described
Second inductor L12 is connected between signal input part Vin and signal output end Vcore.
It should be noted that the inductance of system needs to meet when system work is under conditions of being continuously turned on:
That is, 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 variation can very greatly, it is possible to which leading to electric current of each period for some time on inductance is zero, and system enters interrupted
Conduction mode (DCM), so that the ripple coefficient of output signal becomes larger, the performance depreciation of system.
Based on the above reasons, in this example, it is assumed that when system work is under the conditions of underloading, signal output end
Vcore corresponding output electric current meets above-mentioned formula when being I0, then when actual current size is I1, and I1 < I0, then it shines
The brightness of diode 311 reduces, and the couple current of phototriode 312 reduces, and the input voltage of first comparator 302 reduces,
The first reference voltage value V at this timeref1Greater than the voltage value of the input terminal 321 of the first comparator 302, then described first
Output end 323 (output1) output of comparator 302 is high level, that is to say, that the switch element 33 (MOS transistor)
Control electrode (grid) is high level, and the switch element 33 (MOS transistor) is off state, first inductor at this time
L11, the second inductor L12 access filter circuit, the inductance value L=L11+L12 that filtering circuit 10 accesses；When actual current size
When for I1, and I1 > I0, then the brightness of light emitting diode 311 increases, and the couple current that phototriode 312 generates increases, and first
The input voltage of the input terminal 321 of comparator 302 increases, as the first reference voltage value Vref1Less than the first comparator
The voltage value of 302 input terminal 321, then output end 323 (output1) output of the first comparator 302 is low level,
That is the control electrode (grid) of the switch element 33 (MOS transistor) is low level, the at this time 33 (MOS of switch element
Transistor) it is on state, the second inductor L12 is short-circuited, and only the first inductor L11 accesses filtering circuit 10, mistake
Filter the inductance value L=L11 that circuit 10 accesses.
The driving circuit 20 includes the switch block 21 for connecting the signal input part Vin, the connection switch block
21 signal generator 22, the pressure stabilizing being connected between the signal generator 22 and the output end of the second inductor L12
Circuit 23 (Fig. 2 is unlabeled)；The signal generator 22 generates the conducting that square-wave signal controls the switch block 21, thus will
The supplying DC voltage is converted into pulse signal, and the voltage regulator circuit 23 is used to adjust the square wave letter of the signal generator 22
Number duty ratio, and then adjust the stabilization of the pulse signal.
The DC voltage converting circuit 100 is equipped with and is connected to the signal input part Vin and the first inductor L11
Between the second node 102.The switch block 21 includes the grid connection of PMOS tube T1 and NMOS tube T2, the PMOS tube T1
The signal generator 22, the source electrode of the PMOS tube T1 connect the signal input part Vin, and the drain electrode of the PMOS tube T1 connects
Second node 102 is connect, the grid of the NMOS tube T2 connects the signal generator 22, and the drain electrode of the NMOS tube T2 connects
Second node 102, the source electrode ground connection of the NMOS tube T2 are connect, the signal generator 22 sends the square-wave signal simultaneously
The switch of the PMOS tube T1 and NMOS tube T2 are controlled to the grid of the PMOS tube T1 and NMOS tube T2.
The voltage regulator circuit 23 includes the second comparator 24 connecting with the signal generator 22, connection second ratio
Compared with the third comparator 25 of device 24, current detector 26, integrator 27, RC circuit 28,3rd resistor R3, the 4th resistance R4.
Specifically, second node 102 passes sequentially through current detector 26, integrator 27 connects second comparator
The output end 253 of 24 normal phase input end 242, the third comparator 25 is grounded by the RC circuit 28.First knot
Point 101 connects the inverting input terminal 251 of the third comparator 25, the reverse phase of the third comparator 25 by 3rd resistor R3
Input terminal 251 is also grounded by the 4th resistance R4, and the normal phase input end 252 of the third comparator 25 is for receiving third
Reference voltage Vref3, the output end 253 of the third comparator 25 connects the inverting input terminal 241 of second comparator 24,
The output end 243 of second comparator 24 connects the signal generator 22.
More specifically, the third comparator 25 is used for the electricity of the inverting input terminal 251 of the third comparator 25
The received third reference voltage V of normal phase input end 252 of pressure and the third comparator 25ref3It makes comparisons and obtains voltage difference,
Inverting input terminal 321 of filtering output of the voltage difference through the RC circuit 28 to second comparator 24, the electricity
Current sensor 26 is used to detect the electric current of second node 102, and the integrator 27 is used for the electricity to second node 102
The normal phase input end 242 of voltage output to second comparator 24 is obtained after stream integral operation, specifically, the second comparator 24
Normal phase input end 242 receive second reference voltage of the obtained voltage of the integral operation as second comparator 24
Vref2, the anti-phase input of voltage and second comparator 24 that second comparator 24 is used to obtain the integral operation
The voltage at end 241 exports logic control signal to the signal generator 22 after making comparisons, the signal generator 22 is used for root
The duty ratio of the square-wave signal is adjusted according to the logic control signal.
Specifically, the RC circuit 28 specifically includes the 5th resistance for connecting the output end 252 of the third comparator 25
R5 connects the second capacitor C2 of the 5th resistance R5, and specifically, the 5th resistance R5 is connect by the second capacitor C2
Ground.
Specifically, the DC voltage converting circuit 100 further includes first capacitor C1, and first node 101 passes through institute
State first capacitor C1 ground connection.The DC voltage converting circuit 100 further includes connecting the control terminal 11 and the integrator 27
Selector 41, the connection selector 41 first waveform generator 42 and the second waveform generator 43.The integrator 27
For output voltage after the current integration operation to second node 102 to the selector 41, the selector 41 is used for
Selection first waveform generator 42 shows the product after receiving the first control signal and voltage that the integral operation obtains
The waveform for the voltage that partite transport obtains, the electricity that the selector 41 is used to receive the second control signal and integral operation obtains
The waveform for the voltage for selecting the second waveform generator 43 to show that the integral operation obtains after pressure.
In conclusion the DC voltage converting circuit of the embodiment of the present invention is connect by increasing control circuit with changing circuit
Enter the control mode of inductance part, not only ensure that system can work under the conditions of underloading in continuous conduction mode, also reduce
The ripple coefficient of output signal improves the stability and transfer efficiency of system.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Although the present invention has shown and described referring to specific embodiment, it should be appreciated by those skilled in the art that:
In the case where not departing from the spirit and scope of the present invention being defined by the claims and their equivalents, can carry out herein form and
Various change in details.
Claims (5)
1. a kind of DC voltage converting circuit characterized by comprising
Filtering circuit, the filtering circuit include the first inductor and with concatenated second inductor of first inductor, institute
It states the first inductor and second inductor is connected between signal input part and signal output end, the signal input part is used
In receiving supplying DC voltage, the signal output end is used for output loading DC voltage；
Driving circuit, the driving circuit are connected between the filtering circuit and the signal input part, are used for the confession
Direct current electric pressure is converted into pulse signal；
Control circuit, the control circuit include detection circuit, comparison circuit and switch element, and the switch element includes input
End, output end, control terminal, the input, output end of the switch element is separately connected the both ends of second inductor, described
The control terminal of switch element connects the comparison circuit, and the detection circuit connects the signal output end for detecting the letter
The electric current of number output end simultaneously exports detection voltage to the comparison circuit according to the electric current, and the comparison circuit is for comparing
The detection voltage less than exported after the first reference voltage first control signal to the switch element and make the switch element
Cut-off, thus make first inductor and second inductor be in the signal input part and the signal output end it
Between signal transmission loop in and filter the pulse signal, and then guarantee the DC voltage converting circuit under the conditions of underloading
Work is in continuous conduction mode；
The comparison circuit is used to export second control signal to institute after the detection voltage is greater than the first reference voltage
It states switch element and makes the switching elements conductive, so that first inductor be made to be in the signal input part and the letter
In signal transmission loop between number output end and filter the pulse signal；
The first node being connected between the signal output end and second inductor；
The second node being connected between the signal input part and first inductor；
Wherein, the driving circuit includes the signal of the switch block for connecting the signal input part, the connection switch block
Generator, the voltage regulator circuit being connected between the signal generator and first node；The signal generator is for producing
Raw square-wave signal controls the conducting of the switch block, so that the supplying DC voltage is converted into pulse signal, it is described steady
Volt circuit is used to adjust the duty ratio of the square-wave signal of the signal generator, and then adjusts the stabilization of the pulse signal；
Wherein, the voltage regulator circuit includes the second comparator for connecting the signal generator, connection second comparator
Third comparator, RC circuit, current detector, integrator, 3rd resistor, the 4th resistance of inverting input terminal；Second knot
Point passes sequentially through the current detector, the integrator connects the normal phase input end of second comparator；The third ratio
Pass through the RC circuit ground compared with the output end of device；First node connects the third comparator by the 3rd resistor
Inverting input terminal, the inverting input terminal of the third comparator also passes through the 4th resistance eutral grounding；The third comparator
For the voltage of the voltage of the inverting input terminal of the third comparator and the normal phase input end of the third comparator to be made ratio
Compared with voltage difference is obtained, the voltage difference is exported through the filtering of the RC circuit to the anti-phase input of second comparator
End, the current detector are used to detect the electric current of second node, and the integrator is used for the electricity to second node
Stream integral operation obtains the normal phase input end of voltage output to second comparator, and second comparator is used for described the
The voltage of the normal phase input end of two comparators exports logic after making comparisons with the voltage of the inverting input terminal of second comparator
Signal is controlled to the signal generator, the signal generator, which is used to adjust the square wave according to the logic control signal, to be believed
Number duty ratio；
Wherein, the DC voltage converting circuit further includes the selector for connecting the control terminal and the integrator, connection institute
The first waveform generator and the second waveform generator of selector are stated, the integrator connects the selector, the selector
For being selected after receiving the first control signal and voltage that integral operation obtains described in the first waveform generator shows
The waveform for the voltage that integral operation obtains, the electricity that the selector is used to receive the second control signal and integral operation obtains
The waveform for the voltage for selecting second waveform generator to show that the integral operation obtains after pressure.
2. DC voltage converting circuit according to claim 1, which is characterized in that the detection circuit includes light-emitting diodes
Pipe, phototriode, first resistor, second resistance；The anode of the light emitting diode connects first node, described to shine
The cathode of diode connects the signal output end, and the collector of the phototriode is grounded by the first resistor, institute
The emitter for stating phototriode connects power end by the second resistance, and the collector of the phototriode is also connected with institute
Comparison circuit is stated to export the detection voltage to the comparison circuit.
3. DC voltage converting circuit according to claim 2, which is characterized in that the comparison circuit compares including first
Device, the inverting input terminal of the first comparator connect the collector of the phototriode, the positive of the first comparator
Input terminal connects the control terminal for exporting institute for receiving first reference voltage, the output end of the first comparator
First control signal or the second control signal are stated to the control terminal.
4. DC voltage converting circuit according to claim 1, which is characterized in that the switch block include PMOS tube and
NMOS tube, the grid of the PMOS tube connect the signal generator, and the source electrode of the PMOS tube connects the signal input part,
The drain electrode of the PMOS tube connects second node, and the grid of the NMOS tube connects the signal generator, the NMOS
The drain electrode of pipe connects second node, and the source electrode ground connection of the NMOS tube, the signal generator is for described in transmission simultaneously
Square-wave signal controls the switch of the PMOS tube and NMOS tube to the grid of the PMOS tube and NMOS tube.
5. DC voltage converting circuit according to claim 1 or 4, which is characterized in that the DC voltage converting circuit
It further include first capacitor, first node is grounded by the first capacitor.
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| CN201610417048.1A CN106059297B (en) | 2016-06-12 | 2016-06-12 | DC voltage converting circuit |
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| CN201610417048.1A CN106059297B (en) | 2016-06-12 | 2016-06-12 | DC voltage converting circuit |
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| CN103036426A (en) * | 2012-12-11 | 2013-04-10 | 青岛联盟电子仪器有限公司 | Peak current gradient synchronous booster circuit |
| CN105245103A (en) * | 2014-07-01 | 2016-01-13 | 德克萨斯仪器股份有限公司 | DC to DC converter and pwm controller with adaptive compensation circuit |
| CN105262057A (en) * | 2015-11-27 | 2016-01-20 | 深圳市华星光电技术有限公司 | PMIC protection circuit, display panel and display device |
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| US8138734B2 (en) * | 2009-04-06 | 2012-03-20 | Monolithic Power Systems, Inc. | Accurate current limit for peak current mode DC-DC converter |
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| CN1707930A (en) * | 2004-06-07 | 2005-12-14 | Lg电子株式会社 | Apparatus for converting DC power and method of the same |
| CN101064472A (en) * | 2006-04-26 | 2007-10-31 | 沃福林微电子有限公司 | Switching regulator circuits |
| CN101064475A (en) * | 2006-04-28 | 2007-10-31 | 台达电子工业股份有限公司 | Multi-output DC-DC converter having improved cross modulated performance |
| CN103036426A (en) * | 2012-12-11 | 2013-04-10 | 青岛联盟电子仪器有限公司 | Peak current gradient synchronous booster circuit |
| CN105245103A (en) * | 2014-07-01 | 2016-01-13 | 德克萨斯仪器股份有限公司 | DC to DC converter and pwm controller with adaptive compensation circuit |
| CN105262057A (en) * | 2015-11-27 | 2016-01-20 | 深圳市华星光电技术有限公司 | PMIC protection circuit, display panel and display device |
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| CN106059297A (en) | 2016-10-26 |
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