CN102868293A - Slope compensating method and device of fixed turn-off time control switch converter - Google Patents
Slope compensating method and device of fixed turn-off time control switch converter Download PDFInfo
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Abstract
The invention discloses a slope compensating method and device of a fixed turn-off time control switch converter of a switch power supply. A voltage detection device feeds back the detected voltage to an error amplifier, and produces an error amplifying signal with the standard voltage; a current sampling circuit feeds back the sampled current signal to an inverter, a slope compensating voltage is obtained after inversion to enter a comparer, the slope compensating voltage is compared with the error amplifying signal, after comparison, the output of the comparer is used for triggering an RS trigger; when the error amplifying signal is more than the slope compensating voltage, one output of the RS trigger ensures that a switching device is switched off through a drive device, the other output of the RS trigger ensures that a disconnecting timer starts working; and when a constant time is disconnected, one output of the RS trigger ensures that the switching device is switched on through the drive circuit, and the other output of the RS trigger ensures that the disconnecting timer stops working. According to the invention, the influence of an output voltage phase and a lag inductance current phase on the fixed disconnecting time control stability is eliminated, and the output voltage wave is effectively lowered.
Description
Technical field
The present invention relates to a kind of control method of Switching Power Supply, specifically fixedly control method and the device of the power inverter of turn-off time control power supply.
Background technology
Along with the high speed development of power electronic technology, power electronic equipment and people's work, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply.Switching Power Supply has the advantage of the aspects such as efficient is high, volume is little with respect to the conventional linear stabilized voltage power supply, the develop rapidly of power electronic device provides a very large development space to Switching Power Supply especially, makes it little towards volume, and is lightweight, efficient is high, the large future development that waits of power density.Switching Power Supply mainly is made of power inverter and controller two parts.Power inverter is called again power circuit, mainly comprises switching device, device for transformer and current rectifying and wave filtering circuit.Common power inverter topological structure has Buck converter (buck converter), Boost converter (booster converter), Buck-Boost converter (buck-boost converter), forward converter, anti exciting converter etc.Controller can input or output the variation of voltage by the detection power translation circuit, and produces accordingly the operating state of respective switch signal controlling power conversion circuit switching device, exports with the stable switch power supply thereby regulate the energy that passes to load.The structure of controller and operation principle are determined by the control method that Switching Power Supply adopts.For same power circuit topology, adopts different control methods to exert an influence to the stable state accuracy of system, dynamic property and the aspect such as stable, thereby the research of control method seem and become more and more important.Fixedly turn-off time (FOT) control of Switching Power Supply is because its good transient response and simple control circuit structure are widely used in industrial production.Yet the output capacitance equivalent series resistance (ESR) of power inverter has very large impact to the stability of fixedly turn-off time (FOT) control.
The fixedly turn-off time control technology of Switching Power Supply is the variable Switching Power Supply modulator approach of a kind of switching frequency, also is a kind of control method based on output voltage ripple.Its control thought is: utilize comparator that output voltage and reference voltage are compared, the output of comparator is used for triggering rest-set flip-flop, thereby it is variable to produce ON time, the changeable frequency pulse-modulated signal that turn-off time is constant, with the turn-on and turn-off of control switch device, make output voltage reach desired value.Generally speaking, in order to improve the working life of Switching Power Supply, output filter capacitor often adopts non-aluminum electrochemical capacitor, such as ceramic condenser etc., its equivalent series impedance is less, can't overcome because output voltage ripple phase place hysteresis inductive current phase place causes the problem that system can't steady operation.On the other hand, at the equivalent series resistance of output capacitance hour, reducing frequency phenomenon appears in system, will produce large inductive current ripple and output voltage ripple, thereby has limited to a great extent the integrated of control circuit and promote.
Summary of the invention
The slope compensation control device and the control method thereof that the purpose of this invention is to provide a kind of fixedly turn-off time control switch converter of Switching Power Supply, by introducing a suitable slope compensation voltage, improved the fixedly stability of turn-off time control of Switching Power Supply.
The technical scheme that the slope compensation control device of fixedly turn-off time control switch converter of the present invention adopts is: comprise the switching device that connects input, the filter of connecting switch, the current sampling circuit that connects filter, the voltage check device that connects output, voltage check device and reference voltage connect respectively two inputs of error amplifier, the output of error amplifier connects input of comparator, current sampling circuit connects another input of comparator behind inverter, the output of comparator connects an input of rest-set flip-flop, another input of rest-set flip-flop is connected with the shutoff timer, two outputs of rest-set flip-flop connect respectively shutoff timer and drive circuit, the output connecting switch of drive circuit.
The technical scheme of the control method of the slope compensation control device of fixedly turn-off time control switch converter of the present invention adopts following steps:
Step 1: voltage check device to error amplifier, produces error amplification signal with reference voltage with the Voltage Feedback that detects;
Step 2: current sampling circuit feeds back to inverter with the current signal that samples, and obtains slope compensation voltage after anti-phase to enter comparator, compares with described error amplification signal, after relatively
,The output of comparator is used for triggering rest-set flip-flop;
Step 3: when described error amplification signal during greater than described slope compensation voltage, an output of rest-set flip-flop turn-offs switching device through drive circuit, and simultaneously, another output of rest-set flip-flop makes turn-offs timer and start working;
Step 4: after turn-offing the constant time, turn-off timer and produce a pulse, rest-set flip-flop is resetted, an output of rest-set flip-flop makes the switching device conducting through drive circuit, and simultaneously, another output of rest-set flip-flop quits work the shutoff timer;
Step 5: when described error amplification signal rises to described slope compensation voltage, enter the next pulse control cycle.
Compared with prior art, the invention has the beneficial effects as follows:
1, compares with the control of fixing turn-off time, adopt the present invention to reduce fixedly turn-off time control switch converter to the requirement of output capacitance equivalent series resistance, eliminate output voltage phase place hysteresis inductive current phase place to the fixedly impact of turn-off time control stability, improved the fixedly stability of turn-off time control of Switching Power Supply.
2, controller is sampled to inductor current signal, has realized Cycle by Cycle control and the overcurrent protection of inductive current.
3, in the situation that guarantee system stability work, the present invention can effectively reduce the output voltage ripple of constant turn-off time control switch converter.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is apparatus of the present invention structured flowchart.
Fig. 2 is the electrical block diagram of the embodiment of apparatus of the present invention.
Fig. 3 is the output voltage of the embodiment of the invention and the error amplification signal and driving signal corresponding relation schematic diagram of reference voltage.
Fig. 4 is the time-domain-simulation oscillogram of the switch converters of the embodiment of the invention; Wherein, Fig. 4 (a) is converter output voltage time-domain-simulation waveform; Fig. 4 (b) is the driving signal time-domain-simulation waveform of controller output.
Fig. 5 is that the switch converters of the embodiment of the invention and fixedly turn-off time control is in output capacitance equivalent series resistance hour output voltage time-domain-simulation oscillogram; Wherein, the switch converters controlled for fixing turn-off time of Fig. 5 (a) is at the output voltage time-domain-simulation waveform of output capacitance equivalent series resistance hour; Fig. 5 (b) is that the switch converters of the embodiment of the invention is at the output voltage time-domain-simulation waveform of output capacitance equivalent series resistance hour.
Fig. 6 is that the switch converters of the embodiment of the invention and fixedly turn-off time control is in output capacitance equivalent series resistance hour inductive current time-domain-simulation oscillogram; Wherein, the switch converters controlled for fixing turn-off time of Fig. 6 (a) is at the inductive current time-domain-simulation waveform of output capacitance equivalent series resistance hour; Fig. 6 (b) is that the switch converters of the embodiment of the invention is at the inductive current time-domain-simulation waveform of output capacitance equivalent series resistance hour.
Fig. 7 is in the same stable situation, the embodiment of the invention and the fixing output voltage time-domain-simulation oscillogram of the switch converters of turn-off time control; Wherein, Fig. 7 (a) control for fixing turn-off time the switch converters steady operation time output voltage time-domain-simulation waveform; Output voltage time-domain-simulation waveform when Fig. 7 (b) is the switch converters steady operation of the embodiment of the invention.
Embodiment
The present invention is on fixing turn-off time control basis, the compensation ramp voltage that introducing is controlled as fixing turn-off time through anti-phase inductor current signal, according to the error amplification signal of output voltage and reference voltage and the comparable situation of anti-phase inductor current signal, be used for triggering rest-set flip-flop, produce pulse control signal, conducting and the shutoff of controller control main circuit switch device.ON time is variable according to comparable situation, and the turn-off time is that steady state value still determines by turn-offing timer, and pulse control signal is controlled the main circuit work by drive circuit 13, thereby realizes the fixedly slope compensation chaos controlling of turn-off time control switch converter.Specifically:
As shown in Figure 1, Switching Power Supply mainly is made of power inverter and controller two parts, is the power inverter part outside the dotted line frame, and power inverter partly comprises: input 1, switching device 2, filter 3 and export 4; Annexation is: input 1 is connected to switching device 2, is transferred to filter 3 through behind the switching device 2, enters after filtration output 4 after the effect of wave apparatus 3.Be controller within the dotted line frame, controller comprises: voltage check device 5, reference voltage 6, error amplifier 7, current sampling circuit 8, inverter 9, comparator 10, rest-set flip-flop 11, shutoff timer 12 and drive circuit 13; Annexation is: be connected to the voltage check device 5 of output on 4 and be connected two inputs that connect respectively error amplifier 7 with reference voltage, be connected to the current sampling circuit 8 on the filter 3, behind inverter 9, be connected respectively two inputs of comparator 10 with the output of error amplifier 7, the output of comparator 10 connects an input of rest-set flip-flop 11, rest-set flip-flop 11 another inputs are connected with shutoff timer 12, turn-off the low duration of timer 12 control rest-set flip-flops, i.e. the turn-off time of switching device; Two outputs of rest-set flip-flop 11 connect respectively shutoff timer 12 and drive circuit 13, and one of them output is used for driving turn-offs timer 12, and another is exported behind drive circuit 13, for conducting and the shutoff of control switch device 2.
The structure chart of the embodiment of apparatus of the present invention as shown in Figure 2, comparison diagram 2 and Fig. 1, corresponding relation among Fig. 2 and Fig. 1 between each device is respectively: the corresponding input 1 of input voltage E, the corresponding switching device 2 of S (MOSFET) and diode D, the corresponding filter 3 of inductance L, capacitor C and dead resistance r, the corresponding output 4 of load R, voltage sampling circuit corresponding voltage checkout gear 5, reference voltage V
RefCorresponding reference voltage 6.
Connection concrete among Fig. 2 is: the drain electrode of the positive pole of input voltage E and switch S (MOSFET) is joined, and the end (output negative pole) of the anode of negative pole and diode D, the end of equivalent series resistance r and load R joins; One end of the source electrode of switch S (MOSFET) and the negative electrode of diode D and inductance L joins, and the end (output cathode) of an end of the other end of inductance L and capacitor C and load R joins, and the other end of capacitor C and equivalent series resistance r join.The end (output cathode) of the input of voltage sampling circuit and load R joins, and the normal phase input end of its output and error amplifier 7 joins; Reference voltage V
RefJoin with the inverting input of error amplifier 7; The inverting input of the output of error amplifier 7 and comparator 10 joins; The anode of the input of current sampling circuit 8 and diode D joins, and the input of the output of current sampling circuit 8 and inverter 9 joins, and the normal phase input end of the output of inverter 9 and comparator 10 joins; The S end of comparator 10 outputs and rest-set flip-flop 11 joins; R end and the Q end of rest-set flip-flop 11 join with the output and the input that turn-off timer 12 respectively, its
End joins with the input of drive circuit 13; The grid of the output of drive circuit 13 and switch S (MOSFET) joins.
Being achieved as follows of control method: voltage check device 5 to error amplifier 7, produces error amplification signals with reference voltage 6 with the Voltage Feedback that detects.Current sampling circuit 8 feeds back to inverter 9 with the current signal that samples, and obtains slope compensation voltage after anti-phase to enter comparator 10, compares with error amplification signal.After relatively
,The output of comparator 10 is used for triggering rest-set flip-flop 11, when error amplification signal during greater than slope compensation voltage, rest-set flip-flop 11 set, its output turn-offs switching device 2 through drive circuit 13, the energy-storage travelling wave tube of converter begins to release energy, simultaneously, another output is started working shutoff timer 12.After turn-offing the constant time, turn-off timer 12 and produce a pulse, rest-set flip-flop 11 is resetted, rest-set flip-flop 11 drive pulse signals, an output of rest-set flip-flop 11 makes switching device 2 conductings through drive circuit 13, input 1 is to the converter energy supply, and simultaneously, another output quits work shutoff timer 12.When error amplification signal rises to slope compensation voltage, enter the next pulse control cycle.Thus, the voltage of controller power ratio control circuit stable output.
Fig. 2, Fig. 3 show the fixedly application of turn-off time control switch converter slope compensation chaos controlling technology in the Buck converter.
The concrete course of work and principle are: in sampling instant, by voltage sampling circuit the output voltage and the reference voltage error that sample are amplified the generation error amplification signal.Simultaneously, current sampling circuit samples current signal, obtains slope compensation voltage after inverter is anti-phase, compares by comparator and error amplification signal.When error amplification signal during greater than slope compensation voltage, comparator output high level, rest-set flip-flop is triggered, its
The end output low level makes derailing switch turn-off the constant time; Otherwise the comparator output low level triggers rest-set flip-flop, makes it
End output high level makes the derailing switch conducting, thereby makes the switch converters steady operation.By introducing current signal as slope compensation voltage, improved the fixedly stability of turn-off time control.
Analysis of simulation result:
Fig. 4 is for adopting the PSIM simulation software control method of the present invention to be carried out the result of time-domain-simulation, the transverse axis of component among Fig. 4 (a), (b) is the time (ms), (a) the longitudinal axis is output voltage (V), and the longitudinal axis (b) is for driving signal amplitude (V).As can be seen from Figure 4, the converter working stability, output voltage ripple is little.Simulated conditions: input voltage V
In=15V, reference voltage V
Ref=5V, magnification ratio K=2, inductance L=200uH, capacitor C=100uF, equivalent series resistance r=80m Ω, current sample gain G=-0.06, load R=5 Ω, the constant turn-off time is 20us.
Fig. 5 control for fixing turn-off time and switch converters of the present invention when the output capacitance equivalent series resistance is r=70m Ω, the time-domain-simulation oscillogram of output voltage, component among Fig. 5 (a), (b) be corresponding fixedly turn-off time control and the present invention respectively, transverse axis is the time (ms), and the longitudinal axis is output voltage (V).Among Fig. 5, in identical output capacitance equivalent series resistance situation, adopt the switch converters of the present invention can steady operation, and adopt the switch converters job insecurity that fixing turn-off time controls.As seen adopt switch converters of the present invention to improve Systems balanth.
Fig. 6 control for fixing turn-off time and switch converters of the present invention when the output capacitance equivalent series resistance is r=70m Ω, the time-domain-simulation oscillogram of inductive current, component among Fig. 6 (a), (b) be corresponding fixedly turn-off time control and the present invention respectively, transverse axis is the time (ms), and the longitudinal axis is inductive current (A).Among Fig. 6, adopt switch converters working stability of the present invention, and the inductive current fluctuation is little.
Fig. 7 is the time-domain-simulation oscillogram of fixedly turn-off time control and switch converters of the present invention output voltage when the same stable working condition, component among Fig. 7 (a), (b) be corresponding fixedly turn-off time control and the present invention respectively, transverse axis is the time (ms), and the longitudinal axis is output voltage (V).Among Fig. 7, in the situation that same stable work, the employing fixedly output voltage ripple of the switch converters of turn-off time control is approximately 70mV, adopts the output voltage ripple of switch converters of the present invention to be approximately 50mV.As seen in the situation that maintained switch converter steady operation adopts this method can effectively reduce output voltage ripple.
The present invention also can be used for the Switching Power Supply of Boost converter, Buck-boost converter, Cuk converter, forward converter, half-bridge converter, full-bridge converter constant power the electric circuit constitute except can be used for controlling the power inverter in above-described embodiment.
Claims (2)
1. fixing slope compensation control device of turn-off time control switch converter, comprise the switching device (2) that connects input, the filter (3) of connecting switch (2), the current sampling circuit (8) that connects filter (3), the voltage check device (5) that connects output, it is characterized in that: voltage check device (5) is connected 6 with reference voltage) connect respectively two inputs of error amplifier (7), the output of error amplifier (7) connects (10) inputs of comparator, current sampling circuit (8) connects another input of comparator (10) behind inverter (9), the output of comparator (10) connects an input of rest-set flip-flop (11), another input of rest-set flip-flop (11) is connected with shutoff timer (12), two outputs of rest-set flip-flop (11) connect respectively shutoff timer (12) and drive circuit (13), the output connecting switch (2) of drive circuit (13).
2. fixing control method of the slope compensation control device of turn-off time control switch converter as claimed in claim 1 is characterized in that adopting following steps:
Step 1: voltage check device (5) to error amplifier (7), produces error amplification signal with reference voltage (6) with the Voltage Feedback that detects;
Step 2: current sampling circuit (8) feeds back to inverter (9) with the current signal that samples, and obtains slope compensation voltage after anti-phase to enter comparator (10), compares with described error amplification signal, after relatively
,The output of comparator (10) is used for triggering rest-set flip-flop (11);
Step 3: when described error amplification signal during greater than described slope compensation voltage, an output of rest-set flip-flop (11) turn-offs switching device (2) through drive circuit (13), simultaneously, another output of rest-set flip-flop (11) is started working shutoff timer (12);
Step 4: after turn-offing the constant time, turn-off timer (12) and produce a pulse, rest-set flip-flop (11) is resetted, an output of rest-set flip-flop (11) makes switching device (2) conducting through drive circuit (13), simultaneously, another output of rest-set flip-flop (11) quits work shutoff timer (12);
Step 5: when described error amplification signal rises to slope compensation voltage, enter the next pulse control cycle.
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| US10897197B2 (en) | 2018-10-29 | 2021-01-19 | Texas Instruments Incorporated | Switch-mode power supply with frequency adjustment in discontinuous conduction mode |
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| CN111158265A (en) * | 2020-01-22 | 2020-05-15 | Msj系统有限责任公司 | Simulator of power management chip |
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Application publication date: 20130109 |