CN104377958A - Transient response intensifier circuit for switching power supply - Google Patents
Transient response intensifier circuit for switching power supply Download PDFInfo
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- CN104377958A CN104377958A CN201410706085.5A CN201410706085A CN104377958A CN 104377958 A CN104377958 A CN 104377958A CN 201410706085 A CN201410706085 A CN 201410706085A CN 104377958 A CN104377958 A CN 104377958A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of analogue integrated circuits. A circuit comprises a pulse counter, a transient detecting circuit and a level following auxiliary circuit. The transient detecting circuit is connected with output feedback voltage and reference voltage and is used for comparing of the output feedback voltage and the reference voltage. Rising signals and dropping signals which are detected are input the pulse counter and the level following auxiliary circuit. The pulse counter is in connection with the output end of the transient detecting circuit and a high-end power tube driving signal of a switching power supply and is used for shielding the rising signals for a certain cycle when the dropping signals of the transient detecting circuit are received. The level following auxiliary circuit is connected with the output end of the transient detecting circuit, the feedback voltage, a low-end power driving signal of the switching power supply and a ripple compensating signal of the switching power supply. The circuit has the advantages that a stable working point of an error amplifier can be established quickly, and the stability of a control loop is improved. The circuit is suitable for the switching power supply.
Description
Technical field
The invention belongs to analog integrated circuit technical field, relate to a kind of transient response intensifier circuit for Switching Power Supply.
Background technology
In different types of power supply product, response speed is common pursuing a goal always.For traditional voltage mode control, because error amplifier and compensating network thereof to form a limit (or two limits a zero point) to I haven't seen you for ages, therefore cause loop can not respond for violent transient state saltus step in time and adjust.
In BUCK type dc-dc based on COT (Constant On-Time) control model of ripple, wish the response speed of raising system, inductive current intelligence sample must be unable to do without, and under the application of low ESR (Equivalent Series Resistor) electric capacity, utilize inductive current information can ensure to feed back the system still steady operation of ripple compensation circuit.But system's transient response speed is often controlled the restriction of loop bandwidth, consider the requirement of the stability of a system, it is limited in certain scope usually, governs the Whole Response speed of system.In addition in order to ensure the relatively stable of system operating frequency, ACOT (Adaptive Constant On-Time) control model is widely used at present.
And ACOT control model there will be following two problems: for ensureing the stability of Systematical control loop, normal employing with the error amplifier of larger output capacitance to build zero needed for frequency compensation, limit, but this also determines the DC level that can not be adjusted to the output of ripple compensation circuit in the output of load jump time error amplifier in time, causes transient response to be deteriorated; In addition, because ON time Ton and output voltage Vout is proportional in ACOT pattern, when underloading (heavy duty) is jumped in heavy duty (underloading), Vout increases suddenly (reduction), cause ON time to increase (reductions) and aggravate upper punch (decline) amplitude of output voltage further, thus the transient response speed of deterioration whole system.
Summary of the invention
Object of the present invention, be exactly for the problems referred to above, a kind of transient state enhancing technology is provided, adopt Real-Time Monitoring output voltage whether to exceed threshold range and carry out DC level that dynamic conditioning error amplifier exports and in conjunction with corresponding loop control logic, the ON time of dynamic adjustments ACOT control system and turn-off time, to strengthen system's transient response speed.
Technical scheme of the present invention: a kind of transient response intensifier circuit for Switching Power Supply, comprises pulse counter, transient detection circuit, level follows auxiliary circuit;
Described transient detection circuit is connected with output feedack voltage and reference voltage, for output feedack voltage and reference voltage being compared, the rising signals detected and dropping signal is input to pulse counter and level follows auxiliary circuit;
Output and the Switching Power Supply high side power pipe drive singal of described pulse counter and transient detection circuit are connected, for rising signals being shielded some cycles when receiving the dropping signal of transient detection circuit, concrete grammar, for counting by exporting pulse to power tube, is shielded rising signals by latch function according to count results;
Described level is followed the output of auxiliary circuit and transient detection circuit, output feedack voltage, Switching Power Supply low side power drive singal and Switching Power Supply ripple compensation signal and is connected, for the output signal of Switching Power Supply error amplifier being raised to according to Switching Power Supply low side power pipe drive singal the output voltage of Switching Power Supply ripple compensation circuit after dropping signal being detected; When rising signals being detected, the output signal of Switching Power Supply error amplifier is pulled down to output feedack voltage by voltage follow auxiliary circuit, ensures that output voltage system after normal range (NR) of replying there will not be and opens continuously for twice;
Described transient detection circuit is made up of the first comparator and the second comparator; Wherein, the positive input of the first comparator connects output feedack voltage, and its reverse input end connects reference voltage, and its output is rising signals; The positive input of the second comparator connects reference voltage, and its reverse input end connects output feedack voltage, and its output is dropping signal;
Described pulse counter is made up of the first d type flip flop, the second d type flip flop, 3d flip-flop, the 4th NAND gate, the 5th NAND gate, the second inverter, the 3rd inverter; Wherein, one of the 4th NAND gate input termination power tube output pulse signal, its another input termination soft-start signal, it exports the RESET input of termination first d type flip flop; The D of the first d type flip flop inputs termination power vd D, its
export an input of termination the 5th NAND gate; Another input termination soft-start signal of 5th NAND gate, it exports the RESET input of termination second d type flip flop; The D of the second d type flip flop inputs termination power vd D, and its Q exports the RESET input of termination 3d flip-flop, and its clock signal terminal connects the output of the second inverter; The input termination power tube output pulse signal of the second inverter; The clock signal termination Switching Power Supply high side power drive singal of 3d flip-flop, its
export the clock signal terminal of termination first d type flip flop, it exports through the 3rd inverter output latch signal;
Described level is followed supplementary module and is made up of the 4th inverter, the 5th inverter, the 6th NAND gate, hex inverter, the 7th inverter, the 8th inverter, the first operational amplifier, the second operational amplifier, the first transmission gate, the second transmission gate; Wherein, the positive input of the first operational amplifier connects the output of Switching Power Supply ripple compensation circuit, and its reverse input end and output interconnect, and it exports the input of termination first transmission gate; The positive input of the second operational amplifier connects output feedack voltage, and its reverse input end and output interconnect, and it exports the input of termination second transmission gate; The output of input termination second comparator of the 4th inverter, it exports an input of termination the 6th NAND gate; Another input termination switch power supply low side power drive singal of 6th NAND gate, it exports the input of termination the 5th inverter; The grid of the output termination first transmission gate PMOS of the 5th inverter, its output also connects the input of hex inverter; The grid of the output termination first transmission gate NMOS tube of hex inverter; The output of input termination first comparator of the 7th inverter, it exports the grid of termination second transmission gate NMOS tube, and its output also connects the input of the 8th inverter; The grid of the output termination second transmission gate PMOS of the 7th inverter; First transmission gate is connected the output of following supplementary module as level with the output of the second transmission gate.
Beneficial effect of the present invention is, the stable operating point of error amplifier can be set up fast, and shield RISE signal, until the automatic adjustment and recovery of system output voltage is to normal value after output decline being detected, the transient state individual features of control circuit can be strengthened, add the stability of control loop.
Accompanying drawing explanation
Fig. 1 is the Organization Chart that transient response intensifier circuit of the present invention is applied to canonical system;
Fig. 2 is transient response testing circuit schematic diagram of the present invention;
Fig. 3 is pulse counter schematic diagram of the present invention;
Fig. 4 is that level of the present invention follows auxiliary circuit structural representation;
Each control signal action timing diagram when Fig. 5 is load transient change;
The oscillogram of transient state corresponding intensifier circuit when Fig. 6 is underloading jumping heavy duty;
The oscillogram of transient state corresponding intensifier circuit when Fig. 7 is heavy duty jumping underloading.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
For the ripple control BUCK changer system of traditional constant on-time, the present invention proposes a kind of transient state and strengthen response circuit, physical circuit framework comprises transient detection circuit module, pulse counter module, and level follows auxiliary circuit module.Wherein, output feedack voltage and reference voltage input transient detection circuit detection module; The dropping signal input pulse counter detected, shields some cycles number by pulse counter by rising signals and discharges locking later after dropping signal being detected.The rising detected and dropping signal incoming level follow auxiliary circuit, the discharge and recharge of the output capacitance of departure amplifier.
As shown in Figure 2, described transient detection circuit module comprises, first comparator, the second comparator and pulse counter, output feedack voltage VFB after filtering respectively input there is comparator first comparator of certain misalignment rate and the forward of the second comparator and negative input, reference data voltage VREF is connected with the other end of the first comparator, the second comparator.Wherein, the first comparator exports rising signals, input NAND gate 2 after NAND gate 1 and inverter 1; Another input of NAND gate 1 is pulse counter soft-start signal (LSS); Another input of NAND gate 2 is that pulse counter latches (LOCK) signal; Second comparator exports dropping signal, and be input to NAND gate 3, another input of NAND gate 3 is pulse counter soft-start signal, the output termination pulse counter counting input end of NAND gate 3; The RST end of LSS enter counter.
As Fig. 3, pulse counter module comprises, d type flip flop 1, d type flip flop 2, d type flip flop 3; The D input of power supply signal VDD input trigger 1,2; The Reset that power tube output pulse signal TRIG and RST signal input d type flip flop 1 through NAND gate 4 holds; TRIG inputs the CL end of d type flip flop 2 through reverser 2 simultaneously; D type flip flop 1
output end signal and RST signal are held through the Reset of NAND gate 5 input trigger 2; Power tube output pulse signal TRIG after reverser 2 as clock signal input trigger 2; The Reset end of the output Q input trigger 3 of trigger 2, the grid drive singal HS of high side power pipe connects the clock input of input trigger 3.
Shown in Fig. 4, level is followed auxiliary circuit module and is comprised, the first operational amplifier, the second operational amplifier, transmission gate 1, transmission gate 2 and reverser 4, reverser 5, reverser 6, reverser 7, reverser 8 and NAND gate 6.Slope compensation signal VRAMP inputs the forward end of the first operational amplifier, the output feedack input negative end of the first operational amplifier, connect the input of transmission gate 1 simultaneously, FALL signal is through reverser 4 input nand gate 6, the lower pipe drive singal LS input nand gate other end, NAND gate exports the PMOS grid oppositely inputting transmission gate 1 through one-level, and NAND gate exports the NMOS grid oppositely inputting transmission gate 1 through two-stage; Output feedack voltage VFB inputs the forward end of the second operational amplifier, the output feedack input negative end of the second operational amplifier, access the input of transmission gate TG2 simultaneously, RISE signal inputs the NMOS grid of transmission gate 2 after one-level reverser, inputs the PMOS grid of transmission gate 2 after two-stage reverser; The output of transmission gate 1 and transmission gate 2 connects, and is connected with the output VC of error amplifier.
Be below that transient state strengthens the operation principle of related circuit: as shown in Figure 2, comparator first comparator having certain misalignment rate by two and the second comparator detect rising or the decline of voltage VFB respectively.Here offset voltage is realized by asymmetric differential amplifier design, and misalignment rate is greater than the ripple requirement under systematic steady state work, avoids influential system steady operation.Consider the hysteresis quality of voltage signal, inevitably there is upper punch in system after voltage drop, so need by pulse counter, rising signals RISE to be shielded some cycles number after dropping signal FALL being detected, the misoperation caused of RISE signal during to realize shielding output voltage overshoot.Fig. 3 is the concrete configuration diagram of the pulse counter realizing function of shielding.
As shown in Figure 3, detect that voltage VFB rise and fall signal that saltus step produces occurs and is then used for control level and follows auxiliary circuit, determine when discharge and recharge is carried out to the output capacitance of error amplifier.Consider system real work situation, slightly carry out different designs for the corresponding actions risen and decline especially.
The problem that when causing load jump with the error amplifier of larger output capacitance for improving in control system, system response time is slack-off, further raising the regulation of electrical circuit speed, when detecting that dropping signal FALL is effective and lower pipe drive singal LS arrives, the output signal VC of error amplifier is lifted the output VRAMP rising to rapidly ripple compensation circuit, also will be increased at the charging capacitor of dropping signal valid period self adaptation timer, timing is elongated, to reach the object of containment voltage drop fast.
When detecting that rising signals is effective, then directly closing drive singal, being closed by upper power tube, one is prevent output voltage from continuing to raise, and avoids output voltage and raise and cause TON time lengthening and worsen the possibility of overshoot amplitude further; Meanwhile, VC is pulled down to VFB by voltage follow auxiliary circuit, ensures that output voltage recovers system after normal range (NR) and there will not be and again open continuously
By above-mentioned transient response auxiliary movement, the transient response of system well can be improved effect.
Transient response intensifier circuit proposed by the invention, explanation is emulated by Hspice, when load increases suddenly, cause VOUT to decline, when transient response auxiliary circuit detects that output declines, FALL becomes low level, pulse counter starts counting simultaneously, the action of RISE1 signal when shielding output voltage upper punch below, the final RISE signal that keeps does not overturn in eight switch periods, and afterwards, the output voltage of system has automatically adjusted and has returned back to normal value, as Fig. 5.Concrete, when Fig. 6 represents that load becomes heavy duty from underloading, ON time is temporarily extended, and VC is pulled up to VRAMP when lower pipe is opened; When Fig. 7 represents that load is underloading by heavy duty jumping, RISE signal is switch-off power switching tube by force, and VC is pulled up to VFB when lower pipe is opened.This shows, when the unexpected saltus step of load, transient response intensifier circuit can set up new compensation ripple reference level by assisted error amplifier fast, ensures that system output voltage is replied normal value as early as possible and reduces to be opened by opening by mistake of bringing of voltage overshoot.
Claims (1)
1., for a transient response intensifier circuit for Switching Power Supply, comprise pulse counter, transient detection circuit, level follow auxiliary circuit;
Described transient detection circuit is connected with output feedack voltage and reference voltage, for output feedack voltage and reference voltage being compared, the rising signals detected and dropping signal is input to pulse counter and level follows auxiliary circuit;
Output and the Switching Power Supply high side power pipe drive singal of described pulse counter and transient detection circuit are connected, for rising signals being shielded some cycles when receiving the dropping signal of transient detection circuit, concrete grammar, for counting by exporting pulse to power tube, is shielded rising signals by latch function according to count results;
Described level is followed the output of auxiliary circuit and transient detection circuit, output feedack voltage, Switching Power Supply low side power drive singal and Switching Power Supply ripple compensation signal and is connected, for the output signal of Switching Power Supply error amplifier being raised to according to Switching Power Supply low side power pipe drive singal the output voltage of Switching Power Supply ripple compensation circuit after dropping signal being detected; When rising signals being detected, the output signal of Switching Power Supply error amplifier is pulled down to output feedack voltage by voltage follow auxiliary circuit, ensures that output voltage system after normal range (NR) of replying there will not be and opens continuously for twice;
Described transient detection circuit is made up of the first comparator and the second comparator; Wherein, the positive input of the first comparator connects output feedack voltage, and its reverse input end connects reference voltage, and its output is rising signals; The positive input of the second comparator connects reference voltage, and its reverse input end connects output feedack voltage, and its output is dropping signal;
Described pulse counter is made up of the first d type flip flop, the second d type flip flop, 3d flip-flop, the 4th NAND gate, the 5th NAND gate, the second inverter, the 3rd inverter; Wherein, one of the 4th NAND gate input termination power tube output pulse signal, its another input termination soft-start signal, it exports the RESET input of termination first d type flip flop; The D of the first d type flip flop inputs termination power vd D, its
export an input of termination the 5th NAND gate; Another input termination soft-start signal of 5th NAND gate, it exports the RESET input of termination second d type flip flop; The D of the second d type flip flop inputs termination power vd D, and its Q exports the RESET input of termination 3d flip-flop, and its clock signal terminal connects the output of the second inverter; The input termination power tube output pulse signal of the second inverter; The clock signal termination Switching Power Supply high side power drive singal of 3d flip-flop, its
export the clock signal terminal of termination first d type flip flop, it exports through the 3rd inverter output latch signal;
Described level is followed supplementary module and is made up of the 4th inverter, the 5th inverter, the 6th NAND gate, hex inverter, the 7th inverter, the 8th inverter, the first operational amplifier, the second operational amplifier, the first transmission gate, the second transmission gate; Wherein, the positive input of the first operational amplifier connects the output of Switching Power Supply ripple compensation circuit, and its reverse input end and output interconnect, and it exports the input of termination first transmission gate; The positive input of the second operational amplifier connects output feedack voltage, and its reverse input end and output interconnect, and it exports the input of termination second transmission gate; The output of input termination second comparator of the 4th inverter, it exports an input of termination the 6th NAND gate; Another input termination switch power supply low side power drive singal of 6th NAND gate, it exports the input of termination the 5th inverter; The grid of the output termination first transmission gate PMOS of the 5th inverter, its output also connects the input of hex inverter; The grid of the output termination first transmission gate NMOS tube of hex inverter; The output of input termination first comparator of the 7th inverter, it exports the grid of termination second transmission gate NMOS tube, and its output also connects the input of the 8th inverter; The grid of the output termination second transmission gate PMOS of the 7th inverter; First transmission gate is connected the output of following supplementary module as level with the output of the second transmission gate.
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Cited By (18)
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| CN105356734A (en) * | 2015-11-18 | 2016-02-24 | 浙江大学 | COT-control-based ripple-compensation-based buck circuit power management chip |
| CN106406409A (en) * | 2016-06-03 | 2017-02-15 | 北京大学 | Voltage stabilizing circuit based on dual-way counting control |
| CN106533154A (en) * | 2015-09-10 | 2017-03-22 | 德克萨斯仪器股份有限公司 | Load transient and jitter of improved dc-dc converter |
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| CN106992670A (en) * | 2017-04-07 | 2017-07-28 | 西安电子科技大学 | Adaptive ON time for PFM mode boost type DC DC converters controls circuit |
| CN107093951A (en) * | 2016-02-17 | 2017-08-25 | 富士电机株式会社 | Switching power unit |
| CN107797789A (en) * | 2017-11-11 | 2018-03-13 | 北京中电华大电子设计有限责任公司 | A kind of true random number generator circuit to compare thermal noises of equal resistors that can eliminate imbalance |
| CN107947574A (en) * | 2017-11-16 | 2018-04-20 | 上海芯导电子科技有限公司 | A kind of DC DC Switching Power Supplies for improving control model |
| CN108319317A (en) * | 2018-02-06 | 2018-07-24 | 北京大学深圳研究生院 | A kind of comparison means and the linear voltage-stabilizing apparatus including the comparison means |
| CN108766342A (en) * | 2018-06-26 | 2018-11-06 | 深圳市富满电子集团股份有限公司 | A kind of LED display driving output blanking clamp circuit and LED display |
| CN109997302A (en) * | 2017-02-09 | 2019-07-09 | 密克罗奇普技术公司 | Fast transient response circuit |
| CN111221377A (en) * | 2020-01-20 | 2020-06-02 | 上海交通大学 | Transient response enhancement circuit for COT control Buck converter |
| CN112114611A (en) * | 2019-06-21 | 2020-12-22 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed of voltage mode control loop |
| CN113125183A (en) * | 2021-04-15 | 2021-07-16 | 宁夏特种设备检验检测院 | Performance testing device for car accidental movement protection device |
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| CN107947574B (en) * | 2017-11-16 | 2020-06-26 | 上海芯导电子科技有限公司 | DC-DC switching power supply with improved control mode |
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