CN103973083B - The time of DC-DC controller produces circuit and control method thereof - Google Patents
The time of DC-DC controller produces circuit and control method thereof Download PDFInfo
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- CN103973083B CN103973083B CN201310047498.2A CN201310047498A CN103973083B CN 103973083 B CN103973083 B CN 103973083B CN 201310047498 A CN201310047498 A CN 201310047498A CN 103973083 B CN103973083 B CN 103973083B
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Abstract
The present invention provides the time of a kind of DC-DC controller to produce circuit and control method thereof.Time produces circuit and couples output stage.Time produces circuit and includes sample circuit and counter controller.Sample circuit is for sampling node voltage from output stage, and stores sampling voltage, and wherein node voltage is associated with input voltage, and sampling voltage is that ratio is in node voltage.Counter controller is enable according to control signal.When counter controller enable, perform to supplement electric charge means to stored sampling voltage.
Description
Technical field
The invention relates to the control technology of a kind of DC-DC, the time of espespecially a kind of DC-DC controller produces circuit and control method thereof.
Background technology
Under the circuit framework based on constant on-time (constantontime, referred to as COT), it is necessary to an input voltage could calculate impulse modulation width, and input voltage and pulse width are inversely proportional to.But, if there is the integrated circuit of DC-DC controller without the foot position of input voltage, then need to be used as calculating indirectly by the sampled signal relevant with input voltage the use of parameter, preserve this sampled signal afterwards and use with the cycle supplying next time.It addition, when continuous conduction mode, then the cycle samples the sampled signal being associated with input voltage incessantly continuously, to maintain the verity of sampled signal.But, if under pulse-skip modulating mode (pulseskipmodulation, referred to as PSM), because sampling the deficiency of number of times, over time, become, then preserved sampled signal such as capacitor necessarily has leaky.Then, DC-DC controller on sending once pulse time, capacitor will become apparent from out less accurate sampled signal, will cause that computed pulse is wider, thus causing that an output voltage has higher prominent peak value.
Summary of the invention
In view of this, the present invention provides the time of a kind of DC-DC controller to produce circuit and control method thereof, uses and solves the problem that prior art is addressed.
The present invention provides the time of a kind of DC-DC controller to produce circuit.Time produces circuit and couples output stage.Time produces circuit and includes sample circuit and counter controller.Sample circuit is for sampling node voltage from output stage, and stores sampling voltage.Node voltage is associated with input voltage, and sampling voltage is that ratio is in node voltage.Counter controller couples sample circuit.Counter controller is enable according to control signal, and when counter controller enable, performs to supplement electric charge means to stored sampling voltage.
In one embodiment of this invention, control signal is pulse-skip modulation signal.
In one embodiment of this invention, sample circuit includes resistor network, the first switch and the first capacitor.Resistor network is coupled between the primary nodal point of output stage and earth terminal.The secondary nodal point of the first end coupling resistance network of the first switch.First capacitor is coupled between the second end and the earth terminal of the first switch.Sample circuit is conducting the first switch when sampling, so that the first capacitor storage sampling voltage.
In one embodiment of this invention, sample circuit also includes second switch.Second switch is coupled between the second end of the first switch and the first predeterminated voltage, wherein during counter controller enable, turns on second switch every the first Preset Time, so that the first capacitor is supplemented electric charge by the first predeterminated voltage.
In one embodiment of this invention, sample circuit also includes the 3rd switch, the second capacitor and the 4th switch.First end of the 3rd switch couples the second end of the first switch.Second capacitor is coupled between the second end and the earth terminal of the 3rd switch.4th switch is coupled between the second end and second predeterminated voltage of the 3rd switch.During counter controller enable, first conducting the 4th switchs and disconnects the 3rd switch and continue the second Preset Time, so that the second capacitor stores the second predeterminated voltage, disconnect the 4th switch afterwards and turn on the 3rd switch, so that the first capacitor is supplemented electric charge by the second capacitor.
In one embodiment of this invention, the second predeterminated voltage is more than sampling voltage.
In one embodiment of this invention, DC-DC controller is integrated circuit, and integrated circuit includes the first pin, and the first pin is used for coupling output stage and indirectly coupling input voltage.
The present invention also provides for the control method of generation of a kind of time circuit, suitable in DC-DC controller, DC-DC controller couples output stage, control method comprises the following steps: sample node voltage from output stage, and store sampling voltage, wherein node voltage is associated with input voltage, and sampling voltage is that ratio is in node voltage；And perform to supplement electric charge means to stored sampling voltage according to control signal.
In one embodiment of this invention, time generation circuit includes resistor network, the first switch and the first capacitor.Resistor network is coupled between the primary nodal point of output stage and earth terminal.The secondary nodal point of the first end coupling resistance network of the first switch.First capacitor is coupled between the second end and the earth terminal of the first switch.Conducting the first switch when sampling, so that the first capacitor stores described sampling voltage.
In one embodiment of this invention, time generation circuit also includes second switch.Second switch is coupled between the second end of the first switch and the first predeterminated voltage.When performing to supplement electric charge means, turn on second switch every the first Preset Time, so that the first capacitor is supplemented electric charge by the first predeterminated voltage.
In one embodiment of this invention, time generation circuit also includes the 3rd switch, the second capacitor and the 4th switch.First end of the 3rd switch couples the second end of the first switch.Second capacitor is coupled between the second end and the earth terminal of the 3rd switch.4th switch is coupled between the second end and second predeterminated voltage of the 3rd switch.When performing to supplement electric charge means, first conducting the 4th switchs and disconnects the 3rd switch and continue the second Preset Time, so that the second capacitor stores the second predeterminated voltage, disconnect the 4th switch afterwards and turn on the 3rd switch, so that the first capacitor is supplemented electric charge by the second capacitor.
Based on above-mentioned, the time of the DC-DC controller of the present invention produces circuit and stored sampling voltage can be performed to supplement electric charge means by control method, thus modulating under (PSM) pattern in pulse-skip, maintain the correctness of pulse width, avoid excessive pulse width, so the ripple of output voltage is less.On the other hand, line transient response can also be improved.Therefore, under PSM pattern, if input voltage moment changes, especially when input voltage rises to higher level from relatively low level, DC-DC controller can adjust pulse width in good time, reduces the ripple of output voltage.
It is to be understood that above-mentioned general description and detailed description below be merely illustrative and illustrative, it can not limit the scope that the present invention is intended to advocate.
Accompanying drawing explanation
Following shown accompanying drawing is a part for the description of the present invention, it illustrates embodiments of the invention, it is shown that accompanying drawing is used for principles of the invention is described together with the description of description.
Fig. 1 is the configuration diagram of the DC-DC transducer provided according to one embodiment of the invention；
Fig. 2 is the schematic diagram of the time generation circuit of the DC-DC controller according to one embodiment of the invention offer；
Fig. 3 produces the schematic diagram of circuit for the time provided based on an embodiment of Fig. 2；
Fig. 4 produces the schematic diagram of circuit for the time provided based on another embodiment of Fig. 2；
Fig. 5 produces the flow chart of the control method of circuit for the time that one embodiment of the invention provides.
Description of reference numerals:
10: DC-DC transducer；
110: DC-DC controller；
120: error amplifier；
130: comparator；
140,140A, 140B: the time produces circuit；
150: driver；
160: output stage；
170,170A, 170B: sample circuit；
180: counter controller；
C: capacitor；
C1: the first capacitor；
C2: the second capacitor；
FB: feedback circuit；
GND: earth terminal；
HS: switch on the bridge；
L: inducer；
LG: bridge switch control signal；
LS: bridge switch；
Nx, PH: node；
Spsm: control signal；
SW1: the first switch；
SW2: second switch；
SW3: the three switch；
SW4: the four switch；
S501～S503: the time of one embodiment of the invention produces each step of the control method of circuit；
Ton: ON time signal；
UG: switch on the bridge control signal；
Vcm: comparison signal；
Verr: error signal；
Vfb: feedback signal；
Vfresh: the first predeterminated voltage；
Vhold: sampling voltage；
Vin: input voltage；
Vout: output voltage；
Vphase: node voltage；
Vpre: the second predeterminated voltage；
Vramp: ramp signal；
Vref: reference voltage.
Detailed description of the invention
Now with detailed reference to embodiments of the invention, and described embodiment is described in the accompanying drawings.It addition, used the element/component of same or like label to be used to represent same or like part in diagram and embodiment.
Fig. 1 is the configuration diagram of the DC-DC transducer provided according to one embodiment of the invention.Refer to Fig. 1.Based under the circuit framework of constant on-time, DC-DC transducer 10 includes DC-DC controller 110, output stage 160, inducer L, capacitor C and feedback circuit FB.This DC-DC controller 110 includes error amplifier 120, comparator 130, time generation circuit 140 and driver 150.In other embodiments, error amplifier 120 also can be substituted by trsanscondutance amplifier (transconductanceamplifier), and the present invention is not limited thereto.
Error amplifier 120 produces error signal Verr according to reference voltage Vref with feedback signal Vfb.Comparator 130 compares ramp signal Vramp and error signal Verr, and produces comparison signal Vcm.Time produces circuit 140 and is calculated according to node voltage Vphase and comparison signal Vcm, produces ON time signal Ton according to this.Driver 150 produces switch on the bridge control signal UG and bridge switch control signal LG according to ON time signal Ton, controls switch on the bridge (highsideswitch) HS and bridge switch (lowsideswitch) LS according to this respectively.Output stage 160 for doing the conversion of DC-DC to input voltage vin, thus DC-DC transducer 10 can produce and export an output voltage Vout.
In the present embodiment, DC-DC controller 110 can be configured to integrated circuit, and does not have the foot position of the input voltage vin of DC-DC transducer 10 in integrated circuits.Additionally, node PH is between switch on the bridge HS and bridge switch LS.The upper half cycle in the conversion performing DC-DC, namely during switch on the bridge HS conducting, time produce circuit 140 can by switch on the bridge HS sample a node voltage Vphase using as calculate parameter purposes, afterwards in the lower half cycle, namely during bridge switch LS conducting, preservation node voltage Vphase used with the cycle supplied next time.
Fig. 2 is the schematic diagram of the time generation circuit of the DC-DC controller according to one embodiment of the invention offer.Referring to Fig. 1 and Fig. 2.Time produces circuit 140 and couples output stage 160.Time produces circuit 140 and includes sample circuit 170 and counter controller 180.Counter controller 180 couples sample circuit 170.Sample circuit 170 is for sampling out described node voltage Vphase from the node PH of output stage 160, and stores sampling voltage Vhold.It should be noted that node voltage Vphase is associated with input voltage vin, and sampling voltage Vhold is that ratio is in node voltage Vphase.Counter controller 180 enable according to control signal Spsm.And control signal Spsm can modulate signal for pulse-skip.When counter controller 180 enable, indicate entry into pulse-skip modulating mode, then perform to supplement electric charge means to stored sampling voltage Vhold.
Fig. 3 produces the schematic diagram of circuit for the time provided based on an embodiment of Fig. 2.Refer to Fig. 3.Producing in circuit 140A in the time, sample circuit 170A includes resistor network 190, first and switchs SW1 and the first capacitor C1.Resistor network 190 is coupled between node PH (as shown in Figure 2) and the earth terminal GND of output stage 160.The node Nx of the first end coupling resistance network 190 of the first switch SW1.First capacitor C1 is coupled between the second end and the earth terminal GND of the first switch SW1.Sample circuit 170A is conducting the first switch SW1 when sampling, so that the first capacitor C1 stores sampling voltage Vhold.Therefore, the time produce circuit 140A in due course between lower will update sampling voltage Vhold.
Additionally, sample circuit 170A also includes second switch SW2.Second switch SW2 is coupled between second end of the first switch SW1 and the first predeterminated voltage Vfresh.When counter controller 180 enable, enter pulse-skip modulating mode, then can turn on second switch SW2 every the first Preset Time, so that the first capacitor C1 is supplemented electric charge by the first predeterminated voltage Vfresh.
Additionally, the first predeterminated voltage Vfresh may be set to the dividing potential drop of equivalent inpnt voltage.In the prior art, under PSM pattern, the conducting number of times of switch on the bridge HS will reduce, and then make sampling number of times reduce and cause sampling voltage value to decline.One embodiment of the invention can avoid the magnitude of voltage of sampling to decline because of electric leakage by the mode of this supplementary electric charge.In another alternate embodiment, the first predeterminated voltage Vfresh can change magnitude of voltage with the application of different input voltages, it is possible to the change of the input voltage in line of prediction transient state (linetransient) response in advance and adjust magnitude of voltage at any time.
Fig. 4 produces the schematic diagram of circuit for the time provided based on another embodiment of Fig. 2.Refer to Fig. 4.Producing in circuit 140B in the time, sample circuit 170B includes resistor network 190, first and switchs SW1 and the first capacitor C1.Resistor network 190 is coupled between node PH (as shown in Figure 2) and the earth terminal GND of output stage 160.The node Nx of the first end coupling resistance network 190 of the first switch SW1.First capacitor C1 is coupled between the second end and the earth terminal GND of the first switch SW1.
Sample circuit 170B also includes the 3rd switch SW3, the second capacitor C2 and the 4th switch SW4.First end of the 3rd switch SW3 couples second end of the first switch SW1.Second capacitor C2 is coupled between the second end and the earth terminal GND of the 3rd switch SW3.4th switch SW4 is coupled between the second end and the second predeterminated voltage Vpre of the 3rd switch SW3.When counter controller 180 enable, enter pulse-skip modulating mode, then first conducting the 4th switchs SW4 and disconnects the 3rd switch SW3 and continue the second Preset Time, so that the second capacitor C2 stores the second predeterminated voltage Vpre, disconnect the 4th switch SW4 afterwards and turn on the 3rd switch SW3, so that the first capacitor C1 is supplemented electric charge by the second capacitor C2.
It is noted that if input voltage changed in moment, especially when input voltage rises to higher level from relatively low level, aforesaid supplementary electric charge mode can avoid the leaky of capacitor, and maintains the verity of sampling voltage.Further, DC-DC controller can adjust pulse width in good time, thus reducing the ripple of output voltage.Therefore, when there is line transient response in above-mentioned mode of operation, DC-DC controller will not export wide pulse-modulated signal, so the ripple of output voltage is less.
Additionally, the second predeterminated voltage Vpre may be set to the partial pressure value of the input voltage after prediction in advance changes, in detail, when entering pulse-skip modulating mode, sample circuit 170B can first detect node voltage Vphase at that time and dope input voltage vin.Such as when input voltage is equal to 10V, if the input voltage after prediction has the change of rising 5V, then the second predeterminated voltage Vpre may be set to the partial pressure value of equivalent inpnt voltage 15V.
Based on above-described embodiment disclosure of that, it is possible to converge whole go out a kind of general time produce the control method of circuit.Becoming apparent from, Fig. 5 produces the flow chart of the control method of circuit for the time that one embodiment of the invention provides.Referring to Fig. 2 and Fig. 5, DC-DC controller 110 couples output stage 160.The time of the present embodiment produces the control method of circuit and may comprise steps of.
As shown in step S501, sampling node voltage Vphase from output stage 160, and store sampling voltage Vhold, wherein node voltage Vphase is associated with input voltage vin, and sampling voltage Vhold is that ratio is in node voltage Vphase.
Then, as shown in step S503, perform to supplement electric charge means to stored sampling voltage Vhold according to control signal Spsm.
Additionally, with reference to Fig. 3, conducting the first switch SW1 when sampling, so that the first capacitor C1 stores described sampling voltage Vhold.When performing to supplement electric charge means, turn on second switch SW2 every the first Preset Time, so that the first capacitor C1 is supplemented electric charge by the first predeterminated voltage Vfresh.Or with reference to Fig. 4, when performing to supplement electric charge means, first conducting the 4th switchs SW4 and continues the second Preset Time, so that the second capacitor C2 stores the second predeterminated voltage Vpre, disconnect the 4th switch SW4 afterwards and turn on the 3rd switch SW3, so that the first capacitor C1 is supplemented electric charge by the second capacitor C2.
In sum, the time of the DC-DC controller of the present invention produces circuit and stored sampling voltage can be performed to supplement electric charge means by control method, thus modulating under (PSM) pattern in pulse-skip, maintain the correctness of pulse width, avoid excessive pulse width, so the ripple of output voltage is less.On the other hand, line transient response can also be improved.Therefore, under PSM pattern, if input voltage moment changes, especially when input voltage rises to higher level from relatively low level, DC-DC controller can adjust pulse width in good time, reduces the ripple of output voltage.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (13)
1. the time of a DC-DC controller produces circuit, it is characterised in that couple an output stage, and wherein said output stage is used for the conversion that an input voltage does DC-DC to export an output voltage, and the described time produces circuit and includes:
One sample circuit, for from node sample one node voltage of described output stage, and storing a sampling voltage, wherein said node is between a switch on the bridge and a bridge switch, described node voltage is associated with described input voltage, and described sampling voltage is that ratio is in described node voltage；And
One counter controller, couples described sample circuit, the enable according to a control signal of described counter controller, and when described counter controller enable, stored described sampling voltage is performed one and supplements electric charge means.
2. the time of DC-DC controller according to claim 1 produces circuit, it is characterised in that described control signal is a pulse-skip modulation signal.
3. the time of DC-DC controller according to claim 1 produces circuit, it is characterised in that described sample circuit includes:
One resistor network, couples between a primary nodal point of described output stage and an earth terminal；
One first switch, its first end couples a secondary nodal point of described resistor network；And
One first capacitor, is coupled between the second end and the described earth terminal of described first switch；
Wherein said sample circuit turns on described first switch when sampling, so that described first capacitor stores described sampling voltage.
4. the time of DC-DC controller according to claim 3 produces circuit, it is characterised in that described sample circuit also includes:
One second switch, is coupled between the second end and one first predeterminated voltage of described first switch；
During wherein said counter controller enable, turn on described second switch every one first Preset Time, so that described first capacitor is supplemented electric charge by described first predeterminated voltage.
5. the time of DC-DC controller according to claim 3 produces circuit, it is characterised in that described sample circuit also includes:
One the 3rd switch, its first end couples the second end of described first switch；
One second capacitor, is coupled between the second end and the described earth terminal of described 3rd switch；And
One the 4th switch, is coupled between the second end and one second predeterminated voltage of described 3rd switch；
During wherein said counter controller enable, first turn on described 4th switch and disconnect described 3rd switch and continue one second Preset Time, so that described second capacitor stores described second predeterminated voltage, disconnect described 4th switch afterwards and turn on described 3rd switch, so that described first capacitor is supplemented electric charge by described second capacitor.
6. the time of DC-DC controller according to claim 5 produces circuit, it is characterised in that described second predeterminated voltage is more than described sampling voltage.
7. the time of DC-DC controller according to claim 1 produces circuit, it is characterized in that, described DC-DC controller is an integrated circuit, and described integrated circuit includes one first pin, described first pin is used for coupling described output stage and indirectly coupling described input voltage.
8. the control method of a time generation circuit, it is characterised in that being applicable to the DC controller that always circulates, described DC-DC controller couples an output stage, and described control method includes:
Sampling a node voltage from described output stage, and store a sampling voltage, wherein said node voltage is associated with an input voltage, and described sampling voltage is that ratio is in described node voltage；And
According to a control signal, stored described sampling voltage is performed one and supplement electric charge means.
9. the time according to claim 8 produces the control method of circuit, it is characterised in that described control signal is a pulse-skip modulation signal.
10. the time according to claim 8 produces the control method of circuit, it is characterised in that the described time produces circuit and includes:
One resistor network, is coupled between a primary nodal point of described output stage and an earth terminal；
One first switch, its first end couples a secondary nodal point of described resistor network；And
One first capacitor, is coupled between the second end and the described earth terminal of described first switch；
Wherein turn on described first switch when sampling, so that described first capacitor stores described sampling voltage.
11. the time according to claim 10 produces the control method of circuit, it is characterised in that the described time produces circuit and also includes:
One second switch, is coupled between the second end and one first predeterminated voltage of described first switch；
Wherein when performing described supplementary electric charge means, turn on described second switch every one first Preset Time, so that described first capacitor is supplemented electric charge by described first predeterminated voltage.
12. the time according to claim 10 produces the control method of circuit, it is characterised in that the described time produces circuit and also includes:
One the 3rd switch, its first end couples the second end of described first switch；
One second capacitor, is coupled between the second end and the described earth terminal of described 3rd switch；And
One the 4th switch, is coupled between the second end and one second predeterminated voltage of described 3rd switch；
Wherein when performing described supplementary electric charge means, first turn on described 4th switch and disconnect described 3rd switch and continue one second Preset Time, so that described second capacitor stores described second predeterminated voltage, disconnect described 4th switch afterwards and turn on described 3rd switch, so that described first capacitor is supplemented electric charge by described second capacitor.
13. the time according to claim 12 produces the control method of circuit, it is characterised in that described second predeterminated voltage is more than described sampling voltage.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0709948A1 (en) * | 1994-10-27 | 1996-05-01 | STMicroelectronics S.r.l. | DC-DC converter functioning in pulse skipping mode under low load conditions |
| CN101295925A (en) * | 2007-04-24 | 2008-10-29 | 中芯国际集成电路制造(上海)有限公司 | DC/DC converting system |
| TWI328917B (en) * | 2006-10-04 | 2010-08-11 | Himax Display Inc | Charge pump circuit and control circuit therof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7592791B2 (en) * | 2007-08-07 | 2009-09-22 | Newport Media, Inc. | High efficiency DC-DC converter using pulse skipping modulation with programmable burst duration |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0709948A1 (en) * | 1994-10-27 | 1996-05-01 | STMicroelectronics S.r.l. | DC-DC converter functioning in pulse skipping mode under low load conditions |
| TWI328917B (en) * | 2006-10-04 | 2010-08-11 | Himax Display Inc | Charge pump circuit and control circuit therof |
| CN101295925A (en) * | 2007-04-24 | 2008-10-29 | 中芯国际集成电路制造(上海)有限公司 | DC/DC converting system |
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