CN106033930A - Switching type voltage stabilizer - Google Patents
Switching type voltage stabilizer Download PDFInfo
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- CN106033930A CN106033930A CN201510122383.4A CN201510122383A CN106033930A CN 106033930 A CN106033930 A CN 106033930A CN 201510122383 A CN201510122383 A CN 201510122383A CN 106033930 A CN106033930 A CN 106033930A
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Abstract
A switching type voltage stabilizer is used to receive an input voltage and provide an output voltage correspondingly. The switching type voltage stabilizer comprises a switching circuit, an inductor, a DC compensation circuit and a control circuit; the switching circuit is coupled to the input voltage; the inductor is coupled to the switching circuit, receives the input voltage from the switching circuit and provides the output voltage for a load; the DC compensation circuit compares a feedback signal from the output voltage with a threshold so as to adjust a DC compensation voltage dynamically; and the control circuit is used to decide a responsibility period of the switching circuit, and adjusts the responsibly period of the switching circuit at least according to the DC compensation voltage.
Description
Technical field
The present invention is about a kind of switching type voltage stabilizer, and espespecially one can dynamically adjust duty according to duty
Appoint the switching type voltage stabilizer in cycle (duty cycle).
Background technology
In general, in order to reduce the plain mode of the voltage of DC power supply, to be employing linear
Manostat, but this kind of practice can more power consumption.Relatively, due to switching type voltage stabilizer the most relatively
Not power consumption, is widely used the most.For example, common switching type voltage stabilizer has boosting (boost)
Manostat and blood pressure lowering (buck) manostat, those switching type voltage stabilizers can be adjusted by a feedback path
The responsibility cycle (duty cycle) of its switching switch whole.
But, switching type voltage stabilizer of the prior art often cannot provide good transient response
(transient response).For example, switching type voltage stabilizer of the prior art cannot be in response to system
Load situation adjusts the working cycle accordingly.Therefore, there is a need to provide a kind of new switching type voltage stabilizer
Solve the problems referred to above.
Summary of the invention
One embodiment of the invention provides a kind of switching type voltage stabilizer, and this switching type voltage stabilizer is in order to receive
An one input voltage and output voltage is provided accordingly, and include a switching circuit, an inducer,
One DC offset circuit and a control circuit.This switching circuit is coupled to this input voltage；This inducer
It is coupled to this switching circuit, in order to receive this input voltage from this switching circuit, and provides this output voltage
To a load；This DC offset circuit is in order to enter the feedback signal from this output voltage with a threshold value
Row compares, dynamically to adjust a direct current compensation voltage；This control circuit is in order to determine the duty of this switching circuit
Appointing the cycle, wherein this control circuit can adjust the duty of this switching circuit according at least to this direct current compensation voltage
Appoint the cycle.
The switching type voltage stabilizer of embodiments of the invention can according to the feedback signal from this output voltage, and
Dynamically adjust a direct current compensation voltage, to adjust the responsibility cycle of switching circuit accordingly, wherein work as load
Accelerate when end turns heavy duty for underloading increase responsibility cycle and accelerate when load end attaches most importance to idling underloading to downgrade
Responsibility cycle, and then make load end have more preferable transient response (transient response), and improve entirety
Voltage stabilizing usefulness.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the switching type voltage stabilizer according to the first embodiment of the present invention.
Fig. 2 is the schematic diagram of the switching type voltage stabilizer according to the second embodiment of the present invention.
Fig. 3 is the schematic diagram of the sum signal of the comparator shown in Fig. 2.
Fig. 4 is the sum signal of the comparator shown in Fig. 2 produced waveform under different operation modes.
Fig. 5 is the sum signal in the case of different loads of the comparator shown in Fig. 2 and the output of correspondence
The schematic diagram of signal.
Symbol description
100,200 switching type voltage stabilizer
20 switching circuits
30 inducers
40 DC offset circuits
50 control circuits
52 error amplifiers
54 comparators
56 control logic circuits
60 bleeder circuits
VinInput voltage
VOOutput voltage
COElectric capacity
Q1 first switchs
Q2 second switch
ROLoad
COElectric capacity
RL、RiResistor assembly
RCResistor assembly
R1, R2 resistance
VFBFeedback signal
VCControl signal
VREFReference voltage
VDCDirect current compensation voltage
VCSSensing voltage
VSSlope compensation
VTHThreshold value
W1, W2, W3 waveform
Detailed description of the invention
Some vocabulary is employed to censure specific group in the middle of description and scope of the appended claims
Part.Those of ordinary skill in art is it is to be appreciated that hardware manufacturer may be come with different nouns
Call same assembly.This specification and scope of the appended claims are not used as with the difference of title
Distinguish the mode of assembly, but be used as the criterion distinguished with assembly difference functionally.Say in the whole text
" comprising " mentioned in the middle of bright book and appended claim is an open term, therefore should explain
Become " comprise but be not limited to ".It addition, " coupling " word comprise at this any directly and the most electric
Connection means.Therefore, if a first device is coupled to one second device described in literary composition, then represent this first
Device can directly be electrically connected in this second device, or the most electric by other device or connection means
It is connected to this second device.
Fig. 1 is the schematic diagram of the switching type voltage stabilizer according to the first embodiment of the present invention.Suitching type voltage stabilizing
Device 100 is in order to receive an input voltage VinAnd provide an output voltage Vo accordingly, and comprise all
Change circuit 20, inducer 30, DC offset circuit 40 and a control circuit 50.Inducer 30
It is coupled to switching circuit 20, receives input voltage V in order to adaptive switched circuit 20in, and output electric current is provided
iL(that is inductive current) loads R to oneO.During one first operates, control circuit 50 can open switching
The first switch Q1 in the circuit 20 and second switch Q2 in closedown switching circuit 20, with by energy
From input voltage VinIt is sent to electric capacity C via inducer 30O.In this case, input voltage Vin
Can be by inducer 30 to load ROElectric current is provided.Additionally, during one second operates, control circuit
The first switch Q1 in switching circuit 20 can be closed and open the second switch Q2 in switching circuit 20,
With will be at electric capacity COWithin energy be sent to load RO, inducer 30 can be by its voltage converse to continue
Continue to load ROElectric current is provided.Electric capacity COAnd can couple between ground terminal potential (or low logic current potential)
One resistor assembly RC, and inducer 30 and load ROBetween can couple a resistor assembly RL, but the present invention
It is not limited.
DC offset circuit 40 is in order to will be from output voltage VOFeedback signal VFBWith a predetermined threshold
Value VTHCompare, dynamically to adjust a direct current compensation voltage VDC.DC offset circuit 40 can be by straight
Stream compensates voltage VDCIt is sent to control circuit 50.Control circuit 50 can be according at least to direct current compensation voltage
VDCAdjust the responsibility cycle of switching circuit 20.In other words, direct current compensation voltage VDCSize can shadow
Ring the length of the responsibility cycle of switching circuit 20.For example, when feedback signal VFBLess than threshold value VTH
Time, DC offset circuit 40 can reduce direct current compensation voltage VDC, and then control circuit 50 is extended
The responsibility cycle of switching circuit 20；And when feedback signal VFBMore than threshold value VTHTime, DC compensation electricity
Road 40 can increase direct current compensation voltage VDC, and then make control circuit 50 shorten the responsibility of switching circuit
In the cycle, above operation will be described hereafter in continuous paragraph.Note that in an implementation, DC compensation
Voltage VDCIt is only one of them of multiple control parameters referenced by control circuit 50, in other words, switching
The length of the responsibility cycle of circuit 20 separately can be controlled parameter by other to be affected.
Refer to Fig. 2, Fig. 2 is showing of switching type voltage stabilizer 200 according to the second embodiment of the present invention
Being intended to, wherein switching type voltage stabilizer 200 can be used as a step-down controller (buck convertor), but not
As limit.Note that switching type voltage stabilizer 200 can be considered the one of which of switching type voltage stabilizer 100
Specific implementation, furthermore, it is understood that the control circuit 50 shown in Fig. 1 can as shown in Figure 2 control electricity
The circuit framework on road 250 is realized, but switching type voltage stabilizer 100 is not to be confined to suitching type
The setting of manostat 200.Additionally, for brevity, steady with suitching type in switching type voltage stabilizer 200
The similarity of depressor 100 will the most separately repeat.As in figure 2 it is shown, switching type voltage stabilizer 200 additionally comprises one
Bleeder circuit 60, in order to according to output voltage VOProduce feedback voltage VFB, wherein bleeder circuit 60
Two resistance R1, R2 of available icon realize, but the present invention is not limited.Additionally, control electricity
Road 250 includes error amplifier 52, comparator 54 and a control logic circuit 56.Error
Amplifier 52 is in order to receive feedback signal VFB, and by feedback signal VFBWith a reference voltage VREFCarry out
Relatively, to produce control signal VC.It is a pulse width modulation that comparator 54 can be for example
(pulse-width modulation, PWM) comparator, in order to receive control signal VC, DC compensation
The direct current compensation voltage V that circuit 40 transmitsDC, the sensing voltage of outfan of corresponding switching circuit 20
VCSAnd slope compensation VS, and according to control signal VC, direct current compensation voltage VDC, sense
Survey voltage VCSAnd slope compensation VSProducing a comparative result, wherein this comparative result can be
One square wave, and comparator 54 can be to direct current compensation voltage VDC, sensing voltage VCSAnd slope-compensation letter
Number VSAdd up, and input signal (hereinafter referred to as sum signal) and the control signal of the General Logistics Department will be added
VCIt is compared to export this square wave.Control logic circuit 56 can be according to comparative result (i.e. this square wave)
Determine the responsibility cycle of each switch (i.e. transistor Q1, Q2) in switching circuit 20.In this enforcement
In example, the control end of transistor Q1, Q2 is coupled to control logic circuit 56, and control logic circuit 56
Can the comparative result that transmit according to comparator 54 and open during one first operation the first switch Q1 and
Close second switch Q2, and closedown the first switch Q1 and unlatching second are opened during one second operation
Close Q2, wherein the ON time T of the first switch Q1ON(Q1) with the ratio of an impulse modulation cycle T (also
I.e.) it is responsibility cycle D (Q1) of the first switch Q1, and the ON time of second switch Q2
TON(Q2) with the ratio of this impulse modulation cycle T (that is) be second switch Q2 responsibility week
Phase D (Q2), additionally, D (Q1)+D (Q2)=1, that is the responsibility cycle of the first switch Q1 and second switch
The summation of the responsibility cycle of Q2 is whole (100%) responsibility cycle.
Refer to the schematic diagram of the input signal adding the General Logistics Department that Fig. 3, Fig. 3 are the comparator 54 shown in Fig. 2,
Wherein this sum signal is direct current compensation voltage VDC, sensing voltage VCSAnd slope compensation VS's
Add overall result, and triangular wave (ramp) or sawtooth waveforms (sawtooth) can be considered.VCSFor electricity
Stream induced voltage (current sense voltage), its value can be iL* R, wherein iLFor switching circuit 20
Output electric current, R is resistor assembly RiResistance.By providing direct current compensation voltage VDCTo comparator
54, it is possible to resolve in the case of low confession induced current and low responsibility cycle, switching type voltage stabilizer 200 has sternly
The problem of the operating error of weight.
Refer to sum signal that Fig. 4, Fig. 4 are the comparator 54 shown in Fig. 2 under different operation modes
Produced waveform.As shown in Figure 4, it is sequentially from left to right under low current operation via DC voltage
Compensate produced waveform W1, under low current and low responsibility cycle operate, compensate institute via DC voltage
The waveform W2 produced, and produced without DC voltage compensation under low current and low responsibility cycle operate
Raw waveform W3.As can be seen from Figure 4, when having high responsibility cycle, even if waveform W1 does not makees direct current
Voltage compensation the most still has enough gains；And when responsibility cycle diminishes, the gain of waveform W3 is too
Little and do not carry out DC voltage compensation, this will cause follow-up circuit to have a situation of operating error, and ripple
Shape W2, because having and making DC voltage compensation, can avoid follow-up circuit to have the situation of operating error.
Refer to Fig. 5, Fig. 5 is the sum signal in the case of different loads of the comparator 54 shown in Fig. 2
And the schematic diagram of the output signal of correspondence, wherein by left-to-right be sequentially first mode, normal mode,
Second pattern.First, in middle normal mode, the sum signal of comparator 54 is DC compensation electricity
Pressure VDC, sensing voltage VCSAnd slope compensation VSSummation, and this sum signal can with compare
Control signal V of another input of device 54CCompare, (can be considered exporting a square wave accordingly
It is used for being supplied to the responsibility cycle of control logic circuit 56), wherein exceed control signal when sum signal
VCSize time, comparator 54 output square wave i.e. can be dropped to low level by high levle.
When load (load R as shown in Figure 2 being detectedO) when being heavy condition, most electric current iL
In load loss, cause by load RODividing potential drop and come feedback signal VFBThreshold value V can be less thanTH.Now,
Can use the first mode in left side, wherein DC offset circuit 40 can reduce direct current compensation voltage VDCValue
(that is the direct current compensation voltage V less than normal mode is providedDC), to delay sum signal arrival control
Signal VC(that is the time at DIYU dotted line delayed arrives control signal V time of sizeC).As
This one, the control logic circuit 56 in control circuit 50 can extend the responsibility cycle of switching circuit 20,
To obtain the longer charging interval, and react above-mentioned heavy condition rapidly.
When load (load R as shown in Figure 2 being detectedO) when being light condition, the most least a portion of electricity
Stream iLIn load loss, therefore by load RODividing potential drop and come feedback signal VFBThreshold value V can be more thanTH。
Now, can use second pattern on right side, wherein DC offset circuit 40 can improve direct current compensation voltage
VDCValue (that is provide higher than the direct current compensation voltage V of normal modeDC), so that sum signal arrives
Control signal VCSize time advance (that is in advance time at DIYU dotted line arrive control signal
VC).Consequently, it is possible to the control logic circuit 56 in control circuit 50 can shorten the duty of switching circuit 20
Appoint the cycle, to reduce the time that input voltage is charged.Note that the threshold value of DC offset circuit 40
Can set according to practical application request, it is preferable that set threshold value can reaction load ROEnd
Load situation, so that DC offset circuit 40 can export suitable direct current compensation voltage VDCGive and control electricity
Road 50.
In sum, the present invention switching type voltage stabilizer (switching type voltage stabilizer 100 in such as embodiment,
200) according to the feedback signal from output voltage, and direct current compensation voltage can dynamically be adjusted, with accordingly
Adjust switching circuit responsibility cycle, wherein when load end be underloading turn heavy duty time accelerate increase responsibility cycle
And accelerate to downgrade responsibility cycle when load end attaches most importance to idling underloading, and then load end is made to have more preferable wink
Time response (transient response), and improve overall voltage stabilizing usefulness.
The foregoing is only presently preferred embodiments of the present invention, all according to scope of the invention as claimed done etc.
Valency change and modification, all should belong to the covering scope of the present invention.
Claims (10)
1. a switching type voltage stabilizer, in order to receive an input voltage, and provides an output electricity accordingly
Pressure, this switching type voltage stabilizer includes:
One switching circuit, is coupled to this input voltage；
One inducer, is coupled to this switching circuit, in order to receive this input voltage from this switching circuit, and
There is provided this output voltage to a load；
One DC offset circuit, in order to compare the feedback signal from this output voltage with a threshold value
Relatively, dynamically to adjust a direct current compensation voltage；And
One control circuit, in order to determine the responsibility cycle of this switching circuit, wherein this control circuit can be at least
The responsibility cycle of this switching circuit is adjusted according to this direct current compensation voltage.
2. switching type voltage stabilizer as claimed in claim 1, wherein when this feedback signal is less than this threshold value,
This DC offset circuit reduces this direct current compensation voltage, and then makes this control circuit extend this switching circuit
Responsibility cycle.
3. switching type voltage stabilizer as claimed in claim 1, wherein when this feedback signal is more than this threshold value,
This DC offset circuit increases this direct current compensation voltage, and then makes this control circuit shorten this switching circuit
Responsibility cycle.
4. switching type voltage stabilizer as claimed in claim 1, it is a step-down controller.
5. switching type voltage stabilizer as claimed in claim 1, additionally comprises a bleeder circuit, in order to according to being somebody's turn to do
Output voltage produces this feedback voltage.
6. switching type voltage stabilizer as claimed in claim 1, wherein this control circuit includes:
One error amplifier, in order to receive this feedback signal, and enters this feedback signal with a reference voltage
Row compares, to produce a control signal；
One comparator, in order to receive this control signal, this direct current compensation voltage, to should switching circuit
One sensing voltage and a slope compensation of outfan, and mend according to this control signal, this direct current
Repay voltage, this sensing voltage and this slope compensation and produce a comparative result；And
One control logic circuit, in order to adjust the responsibility cycle of this switching circuit according to this comparative result.
7. switching type voltage stabilizer as claimed in claim 6, wherein this switching circuit comprises:
One first switch, has one first end, is coupled to this input voltage, and one controls end, is coupled to this
Control logic circuit, and one second end；And
One second switch, has one first end, is coupled to the second end of this first switch, and one controls end,
It is coupled to this control logic circuit；
Wherein this control logic circuit according to this comparative result in one first operate during, open this first
Switch and close this second switch, and during one second operates, close this first switch and open
Open this second switch.
8. switching type voltage stabilizer as claimed in claim 7, wherein this first switch and this second switch
For transistor.
9. switching type voltage stabilizer as claimed in claim 6, additionally comprises a resistor assembly, is coupled to this and cuts
Change this outfan of circuit, in order to the output electric current of this switching circuit is converted to this sensing voltage.
10. switching type voltage stabilizer as claimed in claim 6, wherein this comparator is that a pulse width is adjusted
Comparator processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122383.4A CN106033930B (en) | 2015-03-19 | 2015-03-19 | Switching type voltage stabilizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122383.4A CN106033930B (en) | 2015-03-19 | 2015-03-19 | Switching type voltage stabilizer |
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| CN106033930B CN106033930B (en) | 2018-11-13 |
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Cited By (3)
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| CN108418427A (en) * | 2018-02-13 | 2018-08-17 | 昂宝电子（上海）有限公司 | System and method for one or more of regulation power converter threshold value |
| CN109656301A (en) * | 2017-10-11 | 2019-04-19 | 奥特润株式会社 | The method of the voltage slope of real-time slop control device and real-time control voltage-stablizer |
| CN112306133A (en) * | 2020-10-13 | 2021-02-02 | 上海兆芯集成电路有限公司 | Voltage stabilizer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109656301A (en) * | 2017-10-11 | 2019-04-19 | 奥特润株式会社 | The method of the voltage slope of real-time slop control device and real-time control voltage-stablizer |
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| CN112306133B (en) * | 2020-10-13 | 2022-05-10 | 上海兆芯集成电路有限公司 | Voltage stabilizer |
| US11437908B2 (en) | 2020-10-13 | 2022-09-06 | Shanghai Zhaoxin Semiconductor Co., Ltd. | Voltage regulator generating an output voltage according to a coupled load unit |
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| Publication number | Publication date |
|---|---|
| CN106033930B (en) | 2018-11-13 |
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