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CN203504410U - DC-DC converter - Google Patents

DC-DC converter Download PDF

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Publication number
CN203504410U
CN203504410U CN201320343658.3U CN201320343658U CN203504410U CN 203504410 U CN203504410 U CN 203504410U CN 201320343658 U CN201320343658 U CN 201320343658U CN 203504410 U CN203504410 U CN 203504410U
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signal
compensating
current
output
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陈盈吉
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UPI Semiconductor Corp
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UPI Semiconductor Corp
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Abstract

The utility model discloses a direct current to direct current converter. The DC-DC converter includes an output stage, a current sensing unit, an error amplifier, a compensation signal processing unit and a PWM controller. The output stage is used for providing an output current. The current sensing unit generates a compensation current signal which changes along with the output current according to the output current. The error amplifier receives the reference voltage and the feedback voltage and provides an error signal. The feedback voltage is related to the output voltage of the dc-dc converter. The compensation signal processing unit receives the error signal and the compensation current signal to provide a compensation control signal which varies with the output current. The PWM controller receives the compensation control signal and the triangular wave signal to provide a PWM signal to the output stage.

Description

DC-DC converter
Technical field
The utility model is relevant with power supply changeover device, particularly about a kind of DC-DC converter.
Background technology
In recent years, the DC-DC converter of various types (DC-DC Converter) has been widely used in different electronic installations.For example, the pressurizer that has a constant on-time (Constant ON Time, COT) is a kind of DC-DC converter.When feedback voltage is less than reference voltage, constant on-time pressurizer can be within a fixed cycle the main switch of conducting one, and the closing the cycle of the main switch of capable of regulating (off-time), provides comparatively stable output voltage thus.
Yet, for traditional step-down type dc to direct current transducer, when being positioned at the equivalent resistance of load capacitance top when too small, will cause the problem of output ripple too small and output ripple and inductive current out of phase, while causing system output voltage, produce the phenomenon of concussion, have a strong impact on the stability of system.
Utility model content
A category of the present utility model is to propose a kind of DC-DC converter.In a specific embodiment, DC-DC converter comprises output stage, current sensing unit, error amplifier, compensating signal processing unit and PWM controller.Compensating signal processing unit couples current sensing unit and error amplifier.PWM controller couples compensating signal processing unit.Output stage is in order to provide an output current.Current sensing unit produces the compensating current signal changing with output current according to output current.Error amplifier receives reference voltage and feedback voltage and an error signal is provided.Feedback voltage is relevant with the output voltage of DC-DC converter.Compensating signal processing unit reception error signal and compensating current signal are to provide the compensating control signal changing with output current.PWM controller reception compensating control signal and triangular signal are to provide pulse-width modulation signal to output stage.
In an embodiment, pulse-width modulation signal has fixedly ON time.
In an embodiment, DC-DC converter also comprises compensating unit, in order to the error signal that error amplifier is exported, compensates.Compensating unit comprises compensating resistance and building-out capacitor.Compensating resistance is coupled between error amplifier and compensating signal processing unit.Building-out capacitor is coupled between compensating resistance and earth terminal.
In an embodiment, PWM controller comprises triangular wave generator, comparator and pulse-width modulation generator.Triangular wave generator for generating triangular signal.Comparator couples compensating signal processing unit and triangular wave generator, and receives compensating control signal and triangular signal so that triggering signal to be provided.Pulse-width modulation generator couples comparator and output stage, and receives triggering signal.
In an embodiment, compensating signal processing unit comprises the first current source, the second current source and resistance.The first current source is controlled by current sensing unit.The second current source couples earth terminal.The second current source is controlled by current sensing unit.Resistance is coupled between the first current source and the second current source.Error amplifier is coupled between the first current source and resistance.Comparator is coupled between resistance and the second current source.
In an embodiment, compensating signal processing unit comprises resistance, switch and current source.Switch couples respectively error amplifier, operating voltage and resistance.Current source couples respectively resistance, earth terminal and current sensing unit.Current source is controlled by current sensing unit.Comparator is coupled between resistance and current source.
Compared to background technology, the output current that DC-DC converter disclosed in the utility model exports inductance by its current sensing unit to according to output stage produces the compensating current signal that changes with output current to the output of error amplifier.Because error signal is the reverse amplifying signal of feedback voltage, make its equivalence in system amplify output voltage ripple, improve be thus positioned at the equivalent resistance of load capacitance top when too small the phenomenon of the output ripple that causes too small and output ripple and inductive current out of phase, make stably output voltage and can not produce concussion of system, therefore the stability of elevator system effectively.
About advantage of the present utility model and spirit, can be further understood by following utility model detailed description and appended accompanying drawing.
Accompanying drawing explanation
Fig. 1 is according to the circuit diagram of the DC-DC converter of a preferred embodiment of the present utility model.
Fig. 2 is a kind of embodiment of the circuit framework of the compensating signal processing unit in DC-DC converter.
Fig. 3 is the another kind of embodiment of the circuit framework of the compensating signal processing unit in DC-DC converter.
Fig. 4 is a kind of signal waveforms in the DC-DC converter in Fig. 1.
Fig. 5 is the another kind of signal waveforms in the DC-DC converter in Fig. 1.
[main element symbol description]
Figure BDA00003352140000031
Figure BDA00003352140000041
Embodiment
According to a preferred embodiment of the present utility model, it is a kind of DC-DC converter.Please refer to Fig. 1, the circuit diagram of the DC-DC converter that Fig. 1 is the present embodiment.
As shown in Figure 1, DC-DC converter 1 is in order to by input voltage V iNbe converted to output voltage V oUT.DC-DC converter 1 comprises output stage 10, current sensing unit 11, error amplifier 12, compensating signal processing unit 13, PWM controller 14, compensating unit 15, input node N0, output node N1 and outputting inductance L.Input node N0 is in order to receive input voltage V iN; Output node N1 is in order to provide output voltage V oUTto load LD.
Output stage 10 is coupled between input node N0 and earth terminal, and output stage 10 couples respectively PWM controller 14, current sensing unit 11 and outputting inductance L; One end of current sensing unit 11 is coupled to output stage 10, and the other end is coupled to compensating signal processing unit 13; Error amplifier 12 couples respectively compensating signal processing unit 13, reference voltage V rEF, the dividing potential drop node N2 between the first divider resistance R1 and the second divider resistance R2; Compensating signal processing unit 13 couples respectively error amplifier 12, current sensing unit 11, PWM controller 14; PWM controller 14 couples respectively compensating signal processing unit 13 and output stage 10; One end of compensating unit 15 is coupled between error amplifier 12 and compensating signal processing unit 13, and the other end is coupled to earth terminal; Outputting inductance L is coupled between output stage 10 and output node N1.
In addition, output resistance R0 and the output capacitance C0 of serial connection are coupled between outputting inductance L and load LD and earth terminal each other; The first divider resistance R1 and the second divider resistance R2 of serial connection are coupled between outputting inductance L and load LD and earth terminal each other.As shown in Figure 1, due to the feedback voltage V of the dividing potential drop node N2 between the first divider resistance R1 and the second divider resistance R2 fBfor output voltage V oUTthrough the first divider resistance R1 and the second divider resistance R2 dividing potential drop and branch pressure voltage, therefore feedback voltage V fBwith output voltage V oUTrelevant.
Output stage 10 comprises the first switch M1, second switch M2, driver DR and node N3.The first switch M1 is coupled to input node N0; Second switch M2 is coupled between the first switch M1 and earth terminal; Driver DR couples respectively PWM controller 14, the first switch M1 and second switch M2.Driver DR has the fixedly pulse-width modulation signal PWM of ON time in order to receive, and controls according to this unlatching of the first switch M1 and second switch M2 or close.Node N3 is arranged between the first switch M1 and second switch M2.Outputting inductance L couples the output current I that the node N3 of node N3 and output stage 10 exports oUToutputting inductance L flows through.
The output current I that the node N3 of current sensing unit 11 sensing output stages 10 exports oUT, and according to output current I oUTgeneration is with output current I oUTthe compensating current signal I changing cOMPto compensating signal processing unit 13.
Error amplifier 12 have positive input terminal+, negative input end-and output K.Error amplifier 12 is by positive input terminal+reception reference voltage V rEF.Error amplifier 12 is by negative input end-receive and output voltage V from the dividing potential drop node N2 between the first divider resistance R1 and the second divider resistance R2 oUTrelevant feedback voltage V fB.Error amplifier 12 is with reference to voltage V rEFwith feedback voltage V fBsubtract each other rear generation error signal S eRR, and by output K output error signal S eRR.
It should be noted that, due to feedback voltage V fBinput to the negative input end of error amplifier 12-, rather than positive input terminal+, therefore, error signal S eRRfor feedback voltage V fBreverse amplifying signal.That is to say, if error signal S eRRdiminish, equal to strengthen feedback voltage V fB.
In addition, be coupled to the error signal S that the compensating unit 15 of the output K of error amplifier 12 is exported in order to the output K to error amplifier 12 eRRcompensate.In this embodiment, compensating unit 15 comprises compensating resistance R cOMPand building-out capacitor C cOMP.Compensating resistance R cOMPbe coupled between error amplifier 12 and compensating signal processing unit 13; Building-out capacitor C cOMPbe coupled to compensating resistance R cOMPand between earth terminal.
Compensating signal processing unit 13 receives error signal S from error amplifier 12 respectively eRRand receive compensating current signal I from current sensing unit 11 cOMP, and according to error signal S eRRand compensating current signal I cOMPproduce compensating control signal S nCOMP.Due to compensating current signal I cOMPalong with output current I oUTchange, therefore, according to compensating current signal I cOMPthe compensating control signal S producing nCOMPalso can be along with output current I oUTchange.Then, compensating signal processing unit 13 will be with output current I oUTthe compensating control signal S changing nCOMP export PWM controller 14 to.
PWM controller 14 comprises triangular wave generator 140, comparator 142 and pulse-width modulation generator 144.Triangular wave generator 140 is in order to produce triangular signal S rAMP.The positive input terminal of comparator 142+couple compensating signal processing unit 13, its negative input end-couple triangular wave generator 140, and its output J couples pulse-width modulation generator 144.
Comparator 142 is by positive input terminal+receive with output current I from compensating signal processing unit 13 oUTthe compensating control signal S changing nCOMPand by negative input end-receive triangular signal S from triangular wave generator 140 rAMP, and according to compensating control signal S nCOMPand triangular signal S rAMPbetween comparative result produce triggering signal S tR.Then, comparator 142 passes through output J by triggering signal S tRexport pulse-width modulation generator 144 to.
Pulse-width modulation generator 144 couples the driver DR of comparator 142 and output stage 10, in order to receive triggering signal S from comparator 142 tRand provide and there is the pulse-width modulation signal PWM of fixing ON time to the driver DR of output stage 10, cause driver DR control the unlatching of the first switch M1 and second switch M2 or close according to thering is the fixedly pulse-width modulation signal PWM of ON time.
In practical application, the compensating signal processing unit 13 in DC-DC converter 1 of the present utility model can have the circuit framework of different types according to the actual requirements.
Please refer to Fig. 2, Fig. 2 is a kind of embodiment of the circuit framework of the compensating signal processing unit 13 in DC-DC converter 1.As shown in Figure 2, compensating signal processing unit 13 comprises the first current source 131, the second current source 132 and resistance R 3.The compensating resistance R of resistance R 3 and compensating unit 15 cOMPbe connected in parallel to each other.The second current source 132 is coupled to earth terminal.Resistance R 3 is coupled between the first current source 131 and the second current source 132.The first current source 131 and the second current source 132 be controlled by respectively that current sensing unit 11 produces with output current I oUTthe compensating current signal I changing cOMP.
The output K of error amplifier 12 is coupled between the first current source 131 and resistance R 3, and the output K output error signal S of error amplifier 12 eRRbetween the first current source 131 and resistance R 3.The positive input terminal of comparator 142+be coupled between resistance R 3 and the second current source 132, and the positive input terminal of comparator 142+between resistance R 3 and the second current source 132, receive compensating control signal S nCOMP.
That is to say, in this embodiment, the compensating resistance R by setting with compensating unit 15 cOMPthe resistance R 3 being connected in parallel to each other, and current sensing unit 11 is produced with output current I oUTthe compensating current signal I changing cOMPwith the action that mode is filled with electric current and taken out electric current from top to bottom, make current signal after resistance R 3, can produce one with output current I oUTthe compensating control signal S changing nCOMP, and the positive input terminal by comparator 142+input to comparator 142, with triangular signal S rAMPcompare.This action is by not having influence on the electric current of original error amplifier 12 outputs, therefore can possess the characteristic of original compensation.
Please refer to Fig. 3, Fig. 3 is the another kind of embodiment of the circuit framework of the compensating signal processing unit 13 in DC-DC converter 1.As shown in Figure 3, compensating signal processing unit 13 comprises resistance R 4, switch M3 and current source 133.Switch M3 couples respectively error amplifier 12, operating voltage V ddand resistance R 4.Current source 133 couples respectively resistance R 4, earth terminal and current sensing unit 11.Current source 133 be controlled by that current sensing unit 11 produces with output current I oUTthe compensating current signal I changing cOMP.The output K of error amplifier 12 is coupled to the gate of switch M3.The positive input terminal of comparator 142+be coupled between resistance R 4 and current source 133, and receive compensating control signal S between resistance R 4 and current source 133 nCOMP.
That is to say, in this embodiment, current sensing unit 11 produce with output current I oUTthe compensating current signal I changing cOMPafter source follower and resistance R 4, can produce one with output current I oUTthe compensating control signal S changing nCOMP, and the positive input terminal by comparator 142+input to comparator 142, with triangular signal S rAMPcompare.Because current signal is provided by source follower, independent with original compensating unit 15, therefore can not have influence on the electric current of original error amplifier 12 outputs, can possess the characteristic of original compensation.
It should be noted that, Fig. 2 and Fig. 3 are only respectively two kinds of circuit framework of compensating signal processing unit 13 may embodiment, in fact, as long as current sensing unit 11 can be produced with output current I oUTthe compensating current signal I changing cOMPvia electric current, produce one with output current I oUTthe compensating control signal S changing nCOMPthe input of device 142 as a comparison, can meet the requirement of the compensating signal processing unit 13 in DC-DC converter 1 of the present utility model, therefore be not limited with above-described embodiment.
Please refer to Fig. 4, Fig. 4 is a kind of signal waveforms in the DC-DC converter 1 in Fig. 1.As shown in Figure 4, DC-DC converter 1 by comparator 142 for output current I oUTthe compensating control signal S changing nCOMPand triangular signal S rAMPcompare, and the work period (duty cycle) of the pulse-width modulation signal PWM producing according to comparative result adjustment pulse-width modulation generator 144.When time t1, compensating control signal S nCOMPwith triangular signal S rAMPbetween angle theta enough large and can avoid noise jamming, therefore can effectively promote its signal-noise ratio (Signal-to-Noise Ratio, SNR).
Please refer to Fig. 5, Fig. 5 is the another kind of signal waveforms in the DC-DC converter 1 in Fig. 1.From Fig. 1 and Fig. 5, the cycle T in Fig. 5 hload LD in representative graph 1 has higher load capacity, and cycle T in Fig. 5 lthe load LD in representative graph 1 has lower load capacity.When time t2, load LD can become from lower load capacity higher load capacity; When time t3, load LD can become from higher load capacity lower load capacity.When the load capacity of load LD changes, comparator 142 can be for output current I oUTthe compensating control signal S changing nCOMPand triangular signal S rAMPcompare, and adjust its output triggering signal S according to comparative result tRtime point to pulse-width modulation generator 144.Therefore, DC-DC converter 1 of the present utility model can be immediately provides applicable output voltage V according to the load capacity of load LD is corresponding oUTtherefore, can improve the stability of system.
Compared to prior art, the output current that DC-DC converter disclosed in the utility model exports inductance by its current sensing unit to according to output stage produces the compensating current signal that changes with output current to the output of error amplifier.Because error signal is the reverse amplifying signal of feedback voltage, make its equivalence in system amplify output voltage ripple, improve be thus positioned at the equivalent resistance of load capacitance top when too small the phenomenon of the output ripple that causes too small and output ripple and inductive current out of phase, make stably output voltage and can not produce concussion of system, therefore the stability of elevator system effectively.
By the above detailed description of preferred embodiments, hope can be known description feature of the present utility model and spirit more, and not with above-mentioned disclosed preferred embodiment, category of the present utility model is limited.On the contrary, its objective is that hope can contain in the category of the scope of the claims that is arranged in the wish application of the utility model institute of various changes and tool equality.

Claims (6)

1. a DC-DC converter, is characterized in that, above-mentioned DC-DC converter comprises:
One output stage, in order to provide an output current;
One current sensing unit, produces the compensating current signal changing with above-mentioned output current according to above-mentioned output current;
One error amplifier, in order to receive a reference voltage and a feedback voltage and an error signal is provided, wherein above-mentioned feedback voltage is relevant with an output voltage of above-mentioned DC-DC converter;
One compensating signal processing unit, couples above-mentioned current sensing unit and above-mentioned error amplifier, and receives above-mentioned error signal and above-mentioned compensating current signal, so that the compensating control signal changing with above-mentioned output current to be provided; And
One PWM controller, couples above-mentioned compensating signal processing unit, and receives above-mentioned compensating control signal and a triangular signal, to provide a pulse-width modulation signal to above-mentioned output stage.
2. DC-DC converter as claimed in claim 1, is characterized in that, above-mentioned pulse-width modulation signal has a fixing ON time.
3. DC-DC converter as claimed in claim 1, is characterized in that, also comprises:
One compensating unit, compensates in order to the above-mentioned error signal that above-mentioned error amplifier is exported, and above-mentioned compensating unit comprises:
One compensating resistance, is coupled between above-mentioned error amplifier and above-mentioned compensating signal processing unit; And
One building-out capacitor, is coupled between above-mentioned compensating resistance and earth terminal.
4. DC-DC converter as claimed in claim 1, is characterized in that, above-mentioned PWM controller comprises:
One triangular wave generator, in order to produce above-mentioned triangular signal;
One comparator, couples above-mentioned compensating signal processing unit and above-mentioned triangular wave generator, and receives above-mentioned compensating control signal and above-mentioned triangular signal, so that a triggering signal to be provided; And
One pulse-width modulation generator, couples above-mentioned comparator and above-mentioned output stage, and receives above-mentioned triggering signal.
5. DC-DC converter as claimed in claim 4, is characterized in that, above-mentioned compensating signal processing unit comprises:
One first current source, is controlled by above-mentioned current sensing unit;
One second current source, couples earth terminal, and above-mentioned the second current source is controlled by above-mentioned current sensing unit; And
One resistance, is coupled between the first current source and above-mentioned the second current source;
Wherein, above-mentioned error amplifier is coupled between above-mentioned the first current source and above-mentioned resistance, and above-mentioned comparator is coupled between above-mentioned resistance and above-mentioned the second current source.
6. DC-DC converter as claimed in claim 4, is characterized in that, above-mentioned compensating signal processing unit comprises:
One resistance;
One switch, couples above-mentioned error amplifier, an operating voltage and above-mentioned resistance; And
One current source, couples above-mentioned resistance, earth terminal and above-mentioned current sensing unit, and above-mentioned current source is controlled by above-mentioned current sensing unit;
Wherein, above-mentioned comparator is coupled between above-mentioned resistance and above-mentioned current source.
CN201320343658.3U 2012-11-16 2013-06-17 DC-DC converter Expired - Lifetime CN203504410U (en)

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CN104460798A (en) * 2014-10-28 2015-03-25 美科微半导体（上海）有限公司 Method and application of reference voltage correcting circuit for controlling buck converter
CN105450022A (en) * 2016-01-15 2016-03-30 上海铄梵电子科技有限公司 Difference PWM modulator and current-mode DC-DC converter based on the modulator
CN104460798B (en) * 2014-10-28 2017-01-04 美科微半导体（上海）有限公司 A kind of reference voltage correcting circuit controlling buck converter and application
CN111610815A (en) * 2019-02-25 2020-09-01 新唐科技股份有限公司 Voltage conversion device
CN112019045A (en) * 2019-05-29 2020-12-01 晶豪科技股份有限公司 Fixed open-time controller and buck converter device using the same

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JP6462404B2 (en) * 2014-02-28 2019-01-30 株式会社半導体エネルギー研究所 DCDC converter, semiconductor device, and electronic apparatus
CN104539154B (en) * 2014-12-08 2017-05-17 成都芯源系统有限公司 Switch converter and control circuit thereof
US10268222B1 (en) 2017-10-25 2019-04-23 Nanya Technology Corporation Electronic system for adjusting operating voltage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104460798A (en) * 2014-10-28 2015-03-25 美科微半导体（上海）有限公司 Method and application of reference voltage correcting circuit for controlling buck converter
CN104460798B (en) * 2014-10-28 2017-01-04 美科微半导体（上海）有限公司 A kind of reference voltage correcting circuit controlling buck converter and application
CN105450022A (en) * 2016-01-15 2016-03-30 上海铄梵电子科技有限公司 Difference PWM modulator and current-mode DC-DC converter based on the modulator
CN111610815A (en) * 2019-02-25 2020-09-01 新唐科技股份有限公司 Voltage conversion device
CN112019045A (en) * 2019-05-29 2020-12-01 晶豪科技股份有限公司 Fixed open-time controller and buck converter device using the same
CN112019045B (en) * 2019-05-29 2021-09-21 晶豪科技股份有限公司 Fixed open-time controller and buck converter device using the same

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