CN202374168U - Control circuit and power supply circuit - Google Patents
Control circuit and power supply circuit Download PDFInfo
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- CN202374168U CN202374168U CN2011205599054U CN201120559905U CN202374168U CN 202374168 U CN202374168 U CN 202374168U CN 2011205599054 U CN2011205599054 U CN 2011205599054U CN 201120559905 U CN201120559905 U CN 201120559905U CN 202374168 U CN202374168 U CN 202374168U
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Abstract
Disclosed are a control circuit and a power supply circuit which comprise at least two power levels, a comparator, a driving signal generation circuit, an on-time timing device and a driving device. Each of the at least two power levels comprises at least one switch tube; the comparator includes that an opposite phase input end is in coupling connection to an output end of a sampling circuit and receives sampling voltage, a same phase input end receives reference voltage, and an output end of the comparator outputs compare results; the driving signal generation circuit includes that an input end is in coupling connection to the output end of the comparator, and outputs corresponding driving signals respectively at at least two output ends which are respectively in coupling connection to the other two input ends; the on-time timing device outputs constant on-time timing signals at output ends of all phases respectively; and the driving device includes that an input end is in coupling connection to a driving signal generation device and a constant on-time timing device, and receives corresponding driving signals and constant on-time timing signals, and an output end is in coupling connection to the at least two power levels. According to the control circuit and the power supply circuit, when load current step occurs, a same phase mode can be rapidly accessed, and timely response can be made to load changes.
Description
Technical field
The embodiment of the utility model relates to power circuit, is specifically related to a kind of digital control circuit and heterogeneous constant ON time (COT) power circuit that utilizes this digital control circuit.
Background technology
Fig. 1 shows the schematic circuit according to the multinomial constant ON time power circuit of prior art.As shown in Figure 1, output voltage V
OutBe input to the voltage sampling circuit that is made up of resistor, the output voltage sampled signal is input to the inverting input of comparator as feedback signal FB.The in-phase input end of comparator receives reference voltage V
REF, to feedback signal FB and V
REFCompare output compare result signal SET.
Usually adopt: 1) constant V
REF, compensation FB; Perhaps 2) constant FB, compensation V
REFThe COT system is carried out loop compensation.Below adopt constant FB, compensation V
REFSystem as an example the example of property set forth the utility model.As there are not an exclusiveness explanation, V
REFBe the signal after the compensation.Also can pass through to V
REFThe method compensation V of a ramp signal of stack
REF, the V after the compensation
REFNot constant be constant.How carrying out loop compensation, has been that present technique field those of ordinary skill is familiar with.Therefore, exemplary explanation can not be interpreted as the restriction to the utility model.
When feedback signal FB less than V
REFThe time, the pulse signal of comparator output high level, when feedback signal FB greater than V
REFThe time, comparator output low level signal.The output of comparator is coupled to the input of circuits for triggering.Export driving first switching tube the power stage and second drive signal of the switching tube in the power stage mutually mutually from the high level pulse signal of comparator output respectively at the in-phase output end Q of trigger and reversed-phase output Q/.
The drive circuit of first phase receives this drive signal and receives the timing signal from the conducting timing circuit at another input at an input; Drive the control signal PWM1 of switching tube in its positive output end output; The control signal PWM1 ' of switching tube under the output of its reversed-phase output drives, thus the power stage of controlling first phase is with power supply V
InVoltage transitions become switching signal.The drive circuit of second phase receives this drive signal and receives the timing signal from another conducting timing circuit in its another input termination at an input; Drive the control signal PWM2 of switching tube in its positive output end output; The control signal PWM2 ' of switching tube under the output of its reversed-phase output drives, thus the power stage of controlling second phase becomes switching signal with the voltage transitions of power supply Vin.
Output voltage V behind the switching voltage process inductor of the power stage output of first and second phases and the filter filtering that capacitor constitutes
Out
Under stable state, each of heterogeneous converter is out-phase work mutually.But, when big step load electric current occurring, open when each of heterogeneous converter is identical, be operated in cophasal state.In this case, because each conducting when identical makes the transient response of heterogeneous converter be improved, thereby has reduced the requirement to output capacitor.
Fig. 2 shows output voltage V under step appears in power circuit according to prior art at load current the situation
OutWaveform.As shown in Figure 2, because the PWM1 and the PWM2 that two phasing commutators under the situation of step occur at load current still are out-phase work, so slow to the reacting condition of load.
The utility model content
Consider the problems referred to above of the prior art, proposed a kind of control circuit and power circuit, can when load current changes, make response rapidly.
According to the embodiment of the utility model, a kind of control circuit has been proposed, be used for heterogeneous constant ON time power circuit, it is characterized in that said control circuit comprises: at least two power stages, each power stage comprises at least one switching tube; Comparator, its inverting input is coupled to the output of voltage sampling circuit, receives the sampled voltage to the output voltage of said power circuit, and its in-phase input end receives reference voltage, the output output compare result signal of said comparator; Drive signal generation circuit, an input is coupled to the output of said comparator, exports the corresponding driving signal respectively at least two outputs, and said at least two outputs are coupled to two other input respectively; Constant ON time time set is exported the constant conducting timing signal of each phase respectively at its output; And drive unit, input is coupled to said drive signal generation device and said constant ON time time set, receives corresponding driving signal and constant conducting timing signal, and output is coupled to the control end of switching tube in the corresponding power level.
Embodiment according to the utility model; Said drive unit comprises: first drive circuit; An input is coupled to the output of said drive signal generation circuit; Another input is coupled to the output of said constant ON time time set, in the control signal of its output output control first power stage; And second drive circuit, an input is coupled to another output of said drive signal generation circuit, and another output is coupled to another output of said constant ON time time set, in the control signal of its output output control second power stage.
According to the embodiment of the utility model, said constant ON time time set comprises: the first conducting timing circuit, at the constant conducting timing signal of its output output needle to first power stage; And the second conducting timing circuit, at the constant conducting timing signal of its output output needle to second power stage.
Embodiment according to the utility model; Said drive signal generation device comprises: the minimum turn-off time timer; With circuit; A reversed input terminal is coupled to the output of said minimum turn-off time timer, and another input is coupled to the output of said comparator, at the output output logic signal; Trigger; The invert enable end is coupled to said and output circuit; Respectively positive output end and reversed-phase output output needle to second mutually power stage drive signal with to first drive signal of power stage mutually; Wherein, the positive output end of said trigger and reversed-phase output are coupled to two inputs of said minimum turn-off time timer respectively.
According to the embodiment of the utility model, said reference voltage one constant voltage, the sampled voltage of the output voltage of said power circuit is process ramp voltage signal compensated voltage.
According to the embodiment of the utility model, said reference voltage is through the voltage behind the slope compensation, and said sampled voltage is that the output voltage through the said power circuit of resistor network dividing potential drop obtains.
According to the embodiment of the utility model, said control circuit forms integrated circuit.
According to the embodiment of the utility model, a kind of heterogeneous constant ON time power circuit has been proposed, comprising: above-mentioned control circuit; Filter circuit, input are coupled to the output of said control circuit, export said output voltage at its output; And sample circuit, be coupled to the output of said filter circuit, at its output output sampled voltage.
Utilize the scheme of the utility model embodiment; When step appearred in load current, two phasing commutators can get into the push-push operation pattern, can make response timely to the variation of load; Improved the transient response of two phasing commutators, reduced requirement output capacitor.
Description of drawings
Following accompanying drawing has shown the execution mode of the utility model.These accompanying drawings and execution mode provide some embodiment of the utility model with the mode of non-limiting, non exhaustive property, wherein:
Fig. 1 shows the schematic circuit according to the multinomial constant ON time power circuit of prior art;
Fig. 2 shows the waveform of output voltage V out under step appears in power circuit according to prior art at load current the situation;
Fig. 3 shows the sketch map according to the power circuit of an embodiment of the utility model;
Fig. 4 shows the sketch map according to the drive circuit of an embodiment of the utility model;
Fig. 5 shows the sketch map according to the drive signal generation circuit of an embodiment of the utility model;
Fig. 6 shows the phase relation between the two phase control signals under the situation that step appears in power circuit load current according to the utility model embodiment; And
Fig. 7 shows the power circuit V behind slope compensation according to the utility model embodiment
REFPhase relation between the two phase control signals under the situation of step appears in configuration down load current.
Embodiment
To describe the specific embodiment of the utility model below in detail, should be noted that the embodiments described herein only is used to illustrate, be not limited to the utility model.In the following description, for the thorough to the utility model is provided, a large amount of specific detail have been set forth.Yet it is obvious that for those of ordinary skills: needn't adopt these specific detail to carry out the utility model.In other instances,, do not specifically describe known circuit, material or method for fear of obscuring the utility model.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: the special characteristic, structure or the characteristic that combine this embodiment or example to describe are comprised among at least one embodiment of the utility model.Therefore, phrase " in one embodiment ", " in an embodiment ", " example " or " example " that occurs in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can be with any suitable combination and or sub the combination specific characteristic, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that at this diagrammatic sketch that provides all be for illustrative purposes, and diagrammatic sketch is not necessarily to draw in proportion.Should be appreciated that when claiming that " element " " is connected to " or " coupling " during to another element it can be directly to connect or be couple to another element or can have intermediary element.On the contrary, when claiming that element " is directly connected to " or during " directly being couple to " another element, not having intermediary element.Identical Reference numeral indication components identical.Term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
Fig. 3 shows the sketch map according to the power circuit of an embodiment of the utility model.As shown in Figure 3, comprise control circuit 310, filter circuit 312 and voltage sampling circuit 311 according to the power circuit 300 of this embodiment.310 pairs of inputs of control circuit power supply V
InVoltage carry out switch and conducting operation, 312 pairs of these switching voltage signals of filter circuit carry out filtering, output voltage V then
OutOutput as power circuit.In addition, voltage sampling circuit 311 is coupled to the output of said filter circuit, output voltage is sampled output sampled voltage FB.A sampled voltage FB and a reference voltage V
REFBe input to the inverting input and the in-phase input end of the comparator of control circuit.According to the embodiment of the utility model, control circuit 310 can form with discrete component, also can form integrated circuit.
According to the embodiment of the utility model, reference voltage V
REFCan be constant voltage, feedback voltage FB can be through the voltage behind the slope compensation.。
According to another embodiment of the utility model, reference voltage V
REFCan be through the voltage behind the slope compensation, this feedback voltage be that the output voltage through resistor network R1 and R2 dividing voltage supply circuit obtains.
Embodiment according to the utility model; Control circuit 310 comprises at least two power stages 301 and 302, comparator C MP, drive signal generation circuit 307, comprise conducting timing circuit 303 and 304 constant ON time time set, comprise the drive unit of drive circuit 305 and 306.
According to the embodiment of the utility model, each power stage 301 or 302 comprises at least one switching tube.For example, power stage comprises single power switch pipe, last switching tube that perhaps is connected in series and following switching tube.
The inverting input of comparator C MP is coupled to the output of voltage sampling circuit 311, receives the output voltage V to power circuit
OutSampled voltage, in-phase input end receives reference voltage V
REF, the output output compare result signal SET of comparator C MP.
An input of drive signal generation circuit 307 is coupled to the output of comparator C MP, exports the corresponding driving signal respectively at least two outputs, and these at least two outputs are coupled to two other input respectively.
Constant ON time time set is exported the constant conducting timing signal of each phase respectively at its output.For example, constant ON time time set comprises: conducting timing circuit 305, and it is at the constant conducting timing signal of output output needle to power stage 301; And conducting timing circuit 306, it is at the constant conducting timing signal of output output needle to power stage 302.
The input of drive unit is coupled to said drive signal generation device and said constant ON time time set, receives corresponding driving signal and constant conducting timing signal, and output is coupled to the control end of switching tube in the corresponding power level.For example; Drive unit comprises: drive circuit 305; Its input is coupled to the output of drive signal generation circuit 307, and its another input is coupled to the output of ON time timing circuit 303, in the control signal of its output output power controlling level 301; And drive circuit 306, its input is coupled to another output of drive signal generation circuit 307, and its another output is coupled to the output of conducting timing circuit 304, in the control signal of its output output power controlling level 302.
Fig. 4 shows the sketch map according to the drive circuit of an embodiment of the utility model.As shown in Figure 4, drive circuit 305 and 306 any one can comprise logical circuit 401 and the driver 402 that is couple to the output of logical circuit.Driver 402 is coupled to the grid (control end) of the switching tube in the power stage at its output, and exports the control signal of power controlling level.
Fig. 5 shows the sketch map according to the drive signal generation circuit of an embodiment of the utility model.As shown in Figure 5, the drive signal generation device comprises: minimum turn-off time timer 501, with circuit 502 and trigger 503.
The output Q1 of drive signal generation device or the trailing edge of Q2 trigger 501 timing of minimum turn-off time timer, and timing time is to then exporting high level.
Be coupled to the output of minimum turn-off time timer 501 with a reversed input terminal of circuit 502, another input is coupled to the output of comparator C MP, at the output output logic signal.
The invert enable end of trigger 503 is coupled to the output with circuit 502, respectively at positive output end and reversed-phase output output needle to the drive signal of power stage 302 with to the drive signal of power stage 301.If in the time, (FB is less than V for SET=1 at minimum turn-off
REF), then Q1, Q2 in-phase signal.Otherwise if at minimum turn-off in the time, (FB is always greater than V for SET=0
REF), obtain Q1, Q2, i.e. two staggered operations through trigger mean allocation successively.
According to an embodiment of the utility model, the positive output end of trigger 503 and reversed-phase output are coupled to two inputs of minimum turn-off time timer 501 respectively.
Fig. 6 shows the phase relation between the two phase control signals under the situation that step appears in power circuit load current according to the utility model embodiment.
Fig. 7 shows the power circuit V behind slope compensation according to the utility model embodiment
REFPhase relation between the two phase control signals under the situation of step appears in configuration down load current.
Shown in Fig. 6 and 7, be in plateau following time at load current IL, PWM1 and the work of PWM2 out-phase.When big step appearred in load current IL, PWM1 and PWM2 push-push operation had improved the transient response of two phasing commutators, have reduced the requirement to output capacitor.
According to the embodiment of the utility model, when sampled voltage FB less than with reference to V
REFThe time, a phase PWM=1 wherein, switching tube conducting.After the switching tube conducting each time service time constant, this constant ON time is produced by the conducting timing circuit.Out of phase ON time can be identical, also can be different.
According to embodiment; When load current increases rapidly; Output voltage diminishes rapidly, in order to be responded fast, makes output voltage get back to normal level fast; Definition is a period of time after a certain phase switching tube turn-offs the minimum turn-off time, and this minimum turn-off time is greater than the switch periods of 0 this phase during less than steady operation.If minimum turn-off in the time FB less than V
REF, i.e. SET=1, then the switching tube of two phases is open-minded simultaneously.Otherwise, if minimum turn-off in the time FB always greater than V
REF, then the switching tube of two phases is opened signal and is obtained i.e. two staggered operations by the SET signal through trigger mean allocation successively.
In another embodiment, can adopt constant V
REF, compensation FB carries out loop compensation to the COT system.That is, the method for a ramp signal of FB stack compensates FB.This compensation method only influences how to produce the FB signal, and does not influence the drive signal that how to produce homophase.
Should be noted that it is more known ins and outs for a person skilled in the art that top description has been omitted for the utility model is more readily understood.
Those skilled in the art should also be understood that the used term of the used embodiment of the utility model is explanation and exemplary and nonrestrictive term.Because the utility model practical implementation and do not break away from the spirit or the essence of utility model in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (8)
1. a control circuit is used for heterogeneous constant ON time power circuit, it is characterized in that said control circuit comprises:
At least two power stages, each power stage comprises at least one switching tube;
Comparator, its inverting input is coupled to the output of voltage sampling circuit, receives the sampled voltage to the output voltage of said power circuit, and its in-phase input end receives reference voltage, the output output compare result signal of said comparator;
Drive signal generation circuit, an input is coupled to the output of said comparator, exports the corresponding driving signal respectively at least two outputs, and said at least two outputs are coupled to two other input respectively;
Constant ON time time set is exported the constant conducting timing signal of each phase respectively at its output; And
Drive unit, input are coupled to said drive signal generation device and said constant ON time time set, receive corresponding driving signal and constant conducting timing signal, and output is coupled to the control end of switching tube in the corresponding power level.
2. control circuit as claimed in claim 1 is characterized in that, said drive unit comprises:
First drive circuit, an input is coupled to the output of said drive signal generation circuit, and another input is coupled to the output of said constant ON time time set, in the control signal of its output output control first power stage; And
Second drive circuit, an input is coupled to another output of said drive signal generation circuit, and another output is coupled to another output of said constant ON time time set, in the control signal of its output output control second power stage.
3. control circuit as claimed in claim 1 is characterized in that, said constant ON time time set comprises:
The first conducting timing circuit is at the constant conducting timing signal of its output output needle to first power stage; And
The second conducting timing circuit is at the constant conducting timing signal of its output output needle to second power stage.
4. control circuit as claimed in claim 1 is characterized in that, said drive signal generation device comprises:
The minimum turn-off time timer,
With circuit, a reversed input terminal is coupled to the output of said minimum turn-off time timer, and another input is coupled to the output of said comparator, at the output output logic signal;
Trigger, invert enable end are coupled to said and output circuit, respectively positive output end and reversed-phase output output needle to second mutually power stage drive signal be directed against first drive signal of power stage mutually,
Wherein, the positive output end of said trigger and reversed-phase output are coupled to two inputs of said minimum turn-off time timer respectively.
5. control circuit as claimed in claim 1 is characterized in that, said reference voltage is a constant voltage, and the sampled voltage of the output voltage of said power circuit is process ramp voltage signal compensated voltage.
6. control circuit as claimed in claim 1 is characterized in that, said reference voltage is through the voltage behind the slope compensation, and said sampled voltage is that the output voltage through the said power circuit of resistor network dividing potential drop obtains.
7. control circuit as claimed in claim 1 is characterized in that said control circuit forms integrated circuit.
8. a heterogeneous constant ON time power circuit is characterized in that, comprising:
Like the described control circuit of one of claim 1～7;
Filter circuit, input are coupled to the output of said control circuit, export said output voltage at its output; And
Sample circuit is coupled to the output of said filter circuit, at its output output sampled voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205599054U CN202374168U (en) | 2011-12-28 | 2011-12-28 | Control circuit and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205599054U CN202374168U (en) | 2011-12-28 | 2011-12-28 | Control circuit and power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202374168U true CN202374168U (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205599054U Expired - Fee Related CN202374168U (en) | 2011-12-28 | 2011-12-28 | Control circuit and power supply circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103813597A (en) * | 2014-03-10 | 2014-05-21 | 成都芯源系统有限公司 | Driving circuit and timing circuit for illuminating system |
| CN105896980A (en) * | 2015-04-27 | 2016-08-24 | 成都芯源系统有限公司 | Constant on-time controlled DC-DC converter, and multiphase power supply |
| WO2019046507A1 (en) | 2017-08-31 | 2019-03-07 | Active-Semi (Bvi), Inc. | Multiphase converter system and control method |
| CN113556035A (en) * | 2021-06-18 | 2021-10-26 | 华为技术有限公司 | COT parallel circuit and power supply equipment |
-
2011
- 2011-12-28 CN CN2011205599054U patent/CN202374168U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103813597A (en) * | 2014-03-10 | 2014-05-21 | 成都芯源系统有限公司 | Driving circuit and timing circuit for illuminating system |
| CN103813597B (en) * | 2014-03-10 | 2016-03-23 | 成都芯源系统有限公司 | For drive circuit and the timing circuit thereof of illuminator |
| CN105896980A (en) * | 2015-04-27 | 2016-08-24 | 成都芯源系统有限公司 | Constant on-time controlled DC-DC converter, and multiphase power supply |
| WO2019046507A1 (en) | 2017-08-31 | 2019-03-07 | Active-Semi (Bvi), Inc. | Multiphase converter system and control method |
| CN111247500A (en) * | 2017-08-31 | 2020-06-05 | 技领半导体股份有限公司 | Multiphase converter system and control method |
| EP3676681A1 (en) * | 2017-08-31 | 2020-07-08 | Active-Semi (Bvi), Inc. | Multiphase converter system and control method |
| EP3676681A4 (en) * | 2017-08-31 | 2021-05-05 | Active-Semi (Bvi), Inc. | Multiphase converter system and control method |
| CN111247500B (en) * | 2017-08-31 | 2022-03-22 | 技领半导体股份有限公司 | Multiphase converter system and control method |
| CN113556035A (en) * | 2021-06-18 | 2021-10-26 | 华为技术有限公司 | COT parallel circuit and power supply equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20181228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |