CN101741261B - Control system and control method for frequency interpolation pattern cascading off-line PFC-PWM switch power converter - Google Patents
Control system and control method for frequency interpolation pattern cascading off-line PFC-PWM switch power converter Download PDFInfo
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- CN101741261B CN101741261B CN2009101536180A CN200910153618A CN101741261B CN 101741261 B CN101741261 B CN 101741261B CN 2009101536180 A CN2009101536180 A CN 2009101536180A CN 200910153618 A CN200910153618 A CN 200910153618A CN 101741261 B CN101741261 B CN 101741261B
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Abstract
The invention provides a control system and a control method for a frequency interpolation pattern cascading off-line PFC-PWM switch power converter. An PFC module converts an AC voltage to a DC voltage; a control signal of a first switch block of a PFC module is generated by a PFC control signal generation module; the input current of the PFC module is adjusted and the DC voltage output by a first capacitor is steadily kept at the set value; a PWM module converts the output voltage of the PFC module to the output voltage of the control system; a control signal of a second switch block is generated by a frequency interpolation pattern PWM control signal generation module, so that the output voltage of the control system reaches the set DC voltage value; when the first capacitor is charged, the second capacitor is charged at intervals. The invention has the advantages of improving the frequency feature of the DC-DC part, reducing the ripple voltage of the capacitor and the cost, and improving the power factor adjusting coefficients of the cascading off-line PFC-PWM switch power converter.
Description
Technical field
The present invention relates to the off-line switching power supply converter technology, especially cascading off-line PFC-PWM switch power converter control system and method.
Background technology
At present; The switch power converter control system; High power switching power supply transducer control system particularly; Extensively adopt the cascade PFC-PWM switch power converter control system of Synchronization Control pattern, its control loop is simple, need not slope compensation and frequency compensation, required peripheral component are few, make things convenient for the client to use.
Synchronization Control pattern cascading PFC-PWM switch power converter control system as shown in Figure 1 comprises two-stage circuit; Wherein the first order is a boost power factor adjustment circuit; Comprise PFC module (10) and PFC control signal generating module (12); Described PFC module (10) comprises inductance L 1, switch SW 1, switch SW 2, inverter (138) and capacitor C 1, and described PFC control signal generating module (12) comprises error amplifier (128), oscillator (150), comparator (130), d type flip flop (132); The second level is the DC-DC change-over circuit; Comprise PWM module (11) and pwm control signal generation module (13); Described PWM module (11) comprises inductance L 2, switch SW 3, switch SW 4, inverter 140 and capacitor C 2, and described pwm control signal generation module (13) comprises duty ratio regulator (134) and d type flip flop (136).
First order boost power factor adjustment circuit adopts the rising edge modulation technique, and next interim when the rising edge of system clock (being the clock CLK of the oscillator generation of PFC control signal generating module), switch SW 1 is broken off; When the oscillator triangular wave of PFC control signal generating module rises to the output voltage error amplifier VEAO greater than the PFC control signal generating module (as shown in Figure 2), switch SW 1 conducting.The duty ratio of the control signal of switch SW 1, SW2 changes, so that VOUT remains unchanged.
Second level DC-DC change-over circuit adopts the trailing edge adjustment technology, promptly works as the system clock trailing edge and comes temporarily switch SW 3 conductings; When the oscillator triangular wave of PFC control signal generating module rose to the output voltage error amplifier VEAO greater than the PFC control signal generating module, switch SW 3 was broken off.The duty ratio of switch SW 3, SW4 is normally constant, has only when partial input voltage (being the voltage on the C1) changes just to change.
Synchronization Control pattern cascading PFC-PWM switch power converter control system as shown in Figure 1 is used the control signal control switch SW1 and the SW3 of same system clock generating synchronous sequence, like Fig. 3,4, shown in 5.
Ripple voltage can be used for weighing the amount of scurrying into direct voltage from alternating voltage.For the Synchronization Control pattern cascading PFC-PWM switch power converter control system shown in the accompanying drawing 1; The ripple voltage of PFC output stage can be divided into two components: first component is that second component is that the variation of voltage on the capacitor C 1 causes owing to capacitor C 1, the last equivalent resistance ESR of C2 cause.When PFC level and PWM level all were operated in the continuous current pattern, the last ripple voltage size of C1 was:
The maximum current I of the switch SW of flowing through 2
2maxFor:
Because first order transducer operates mainly in current-mode, and power frequency is limited by power frequency.So first order voltage control loop is designed to slow response, so that electric current can be followed change in voltage.Second level transducer just needs more fast and more accurate voltage control like this.
When system start-up or during the load instantaneous variation, system needs a period of time could arrive its maximum load capability.If the time that gives less than during this period of time, will cause first order transducer to be closed.Therefore, the output voltage of first order transducer is monitored by dc ok comparator.When the output voltage of first order power factor governing stage is lower than 380 volts of direct voltages, second level pulse width modulation level will be closed by dc ok comparator.In case when first order output voltage is higher than 380 volts of direct voltages, second level pulse width modulation level will be unlocked.
The cascade PFC-PWM switch power converter control system shortcoming of above-mentioned Synchronization Control pattern is: because PFC, PWM adopt synchronised clock, so PFC, PWM can only adopt same operating frequency.Because first order transducer operating frequency is limited by power frequency, so frequency is lower.When second level transducer adopts synchronised clock, just mean that also the operating frequency of second level transducer also is restricted.There is frequency limitation in second level transducer when realizing more fast with more accurate voltage control.Limit the value of inductance L 1, L2 and capacitor C 1 simultaneously, can't further reduce ripple and the cost of cutting down inductance on the capacitor C 1; Limited the raising of power factor adjustment coefficient.
In order to improve the frequency response of PWM level, can the PWM clock frequency be made as the twice of first order transducer working clock frequency.But the time of this moment SCV1 and SCV3 conducting simultaneously will drop to the half the of Synchronization Control pattern cascading PFC-PWM switch power converter control system as shown in Figure 1, will cause ripple to become big.
Summary of the invention
What the present invention will solve is the deficiency that Synchronization Control pattern cascading PFC-PWM switch power converter control system exists; The frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system is provided; Overcome the work frequency restriction, reduce ripple voltage and reduce system cost.
The present invention also provides the frequency interpolation pattern cascading off-line PFC-PWM switch power converter control method.
The frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system comprises PFC module, PWM module, PFC control signal generating module and inserts pattern pwm control signal generation module frequently:
Said PFC module is carried out the conversion of alternating voltage to direct voltage, through first port and the second port incoming transport voltage VIN; Through the first electric capacity output dc voltage; Be the output voltage of PFC module, the control signal of first switches set is controlled first switches set adjustment input current, makes the waveform of the waveform of input current near input voltage; Even input voltage changes, the still stable set point that remains on of first capacitor C, 1 output dc voltage.
Said PWM module; The output voltage of said PFC module is transformed into the output voltage of control system, makes the output voltage of said control system reach the setting dc voltage value, the input port of PWM module connects the two ends of said first electric capacity; The control signal control second switch group of second switch group; The output voltage of said control system is through the 3rd port and the output of the 4th port, and said the 4th port connects second port, and the two ends of second electric capacity are connected said the 3rd port and the 4th port;
Said PFC control signal generating module produces the control signal of first switches set;
Said slotting frequency pattern pwm control signal generation module produces the control signal of second switch group;
First switches set comprises first switch and second switch; The second switch group comprises the 3rd switch and the 4th switch;
When the oscillator triangular wave of PFC control signal generating module is lower than the output voltage error amplifier of PFC control signal generating module; The PFC control signal generating module is exported first control signal breaks off the switch of winning; Second switch conducting, first electric capacity begin charging; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator of PWM module produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch conduction, the 4th switch breaks off; During the no pulse clock signal, the 3rd switch breaks off, the 4th switch conduction; Thereby cause in the process of first electric capacity charging charging of second capacitance interval.
Said first switches set and said first electric capacity that said PFC module comprises first inductance, is made up of first switch, second switch and first reverser; First port of one termination input voltage of said first inductance; Said first switch of another termination of inductance and second switch; Said first electric capacity is connected between the other end of the other end and second switch of first switch; The link of first switch and first electric capacity is connected second port, and first control signal of first switch produces the control signal of second switch after through the first inverter anti-phase.
Said second switch group and described second electric capacity that said PWM module comprises second inductance, is made up of the 3rd switch, the 4th switch and second inverter; The 3rd switch one end serial connection second switch; Another termination the 4th switch and second inductance of the 3rd switch; Second electric capacity is connected the other end of the 4th switch and the other end of second inductance; The link of the 4th switch and second electric capacity is connected second port, produces the control signal of the 4th switch after second control signal process inverter anti-phase of the 3rd switch.
Said PFC control signal generating module comprises error amplifier, oscillator, comparator, first d type flip flop; The output voltage of said control system is input to the positive input terminal of said error amplifier through dividing potential drop; Reference voltage is input to the negative input end of error amplifier; The output termination comparator positive input terminal of error amplifier, the triangular signal that oscillator produces is input to the negative input end of comparator, and the output of comparator is received the data input pin D of first d type flip flop; The clock that oscillator produces is input to the input end of clock of first d type flip flop, and the Q output of d type flip flop produces first switching signal;
Said slotting frequency pattern pwm control signal generation module comprises PWM clock generator and d type flip flop; The triangular wave of said oscillator is input to the input of PWM clock generator; The output of PWM clock generator is connected to the input end of clock of second d type flip flop; The output of comparator is received the data input pin D of second d type flip flop, and the Q output of second d type flip flop produces the second switch signal.
The PWM clock generator; Comprise second comparator, the 3rd comparator, the 4th comparator and logical circuit; The triangular wave of said oscillator is input to the positive input terminal of second comparator, the 3rd comparator, the 4th comparator respectively; The second threshold voltage VTH0, the 3rd threshold voltage VTH1, the 4th threshold voltage VTH2 are input to the negative input end of second comparator, the 3rd comparator, the 4th comparator respectively; The output of second comparator, the 3rd comparator, the 4th comparator is connected to the input of logical circuit, and logical circuit carries out logical operation, produces PWM clock CLK_PWM.
The clock that said PWM clock generator produces is equivalent to traditional clock high level partly is divided into two.
The control method of aforesaid frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system comprises the steps:
(1) frequency interpolation pattern cascading off-line PFC-PWM switch power converter input ac voltage VIN, described PFC module, PWM module, PFC control signal generating module and the slotting generation module of pattern pwm control signal frequently are in running order;
(2) when the oscillator triangular wave is lower than output voltage error amplifier, the PFC control signal generating module is exported first control signal breaks off the switch of winning, the second switch conducting, and first electric capacity begins charging; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal, because the PWM clock generator produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal, the 3rd switch conduction, the 4th switch breaks off; During the no pulse clock signal, the 3rd switch breaks off, the 4th switch conduction; Thereby cause in the process of first electric capacity charging charging of second capacitance interval;
When (3) the oscillator triangular wave rose to greater than output voltage error amplifier, the PFC control signal generating module was exported first control signal and is made the switch conduction of winning, and second switch breaks off; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch breaks off; The 4th switch conduction, first electric capacity is unsettled, second capacitor discharge; During the no pulse clock signal, the 3rd switch conduction, the 4th switch breaks off, first capacitor discharge, the charging of second electric capacity.
Frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system and method for the present invention's proposition; The ripple voltage of PFC module output stage can be divided into two components: first component is that second component is that the variation of voltage on first capacitor C 1 causes because first capacitor C 1, the last equivalent resistance ESR of C2 cause.When PFC level and PWM level all were operated in the continuous current pattern, the present invention was equivalent to the operating frequency of second level transducer is brought up to 2 * fsw, and second level transducer can be realized more fast and more accurate voltage control like this.The last ripple voltage size of C1 is:
Under the constant situation of other condition, V
RippleTo diminish.Perhaps at V
RippleUnder the constant condition, the value of first capacitor C 1 can reduce half the, thereby reduces system cost.
Compare with the twice that simply the PWM clock frequency is made as first order transducer working clock frequency, the present invention is reducing (I
2max-I
3) on have clear superiority.The present invention is in the SW2 conducting, and SW3 also is conducting basically.And simple when the PWM clock frequency is made as the twice of first order transducer working clock frequency, in the SW2 conducting, it is conducting that SW3 has only the half the time.
Beneficial effect of the present invention is: insert the PWM clock of pattern frequently through providing; Greatly improved the frequency characteristic of the DC-DC part of cascading off-line PFC-PWM switch power converter; Make that the DC-DC partial reaction of cascading off-line PFC-PWM switch power converter is rapider; And reduced the ripple voltage of electric capacity, improved the power factor adjustment coefficient of cascading off-line PFC-PWM switch power converter.
Description of drawings:
Fig. 1 is a conventional synchronization control model cascade PFC-PWM switch power converter control system structure chart.
Fig. 2 is output voltage error amplifier and an oscillator triangular wave oscillogram in the conventional synchronization control model cascade PFC-PWM switch power converter control system.
Fig. 3 is the voltage oscillogram of switch SW 1 in the conventional synchronization control model cascade PFC-PWM switch power converter control system.
Fig. 4 is the voltage oscillogram of switch SW 3 in the conventional synchronization control model cascade PFC-PWM switch power converter control system.
Fig. 5 is the clock waveform figure of oscillator output in the conventional synchronization control model cascade PFC-PWM switch power converter control system.
Fig. 6 is for inserting the circuit structure diagram of pattern cascading PFC-PWM switch power converter control system frequently.
Fig. 7 is for inserting the PWM clock generator structure chart of pattern cascading PFC-PWM switch power converter control system frequently.
Fig. 8 is for inserting output voltage error amplifier and oscillator triangular wave oscillogram in the frequency pattern cascading PFC-PWM switch power converter control system.
Fig. 9 is for inserting the voltage oscillogram of switch SW 1 in the frequency pattern cascading PFC-PWM switch power converter control system.
Figure 10 is for inserting the voltage oscillogram of switch SW 3 in the frequency pattern cascading PFC-PWM switch power converter control system.
Figure 11 is for inserting the clock waveform figure of oscillator output in the frequency pattern cascading PFC-PWM switch power converter control system.
Figure 12 is comparator threshold voltage and oscillator triangular wave oscillogram in the PWM clock generator in the slotting switch power converter of the pattern cascading PFC-PWM frequently control system.
Figure 13 is the output waveform figure of comparator C MP0 in the PWM clock generator in the slotting switch power converter of the pattern cascading PFC-PWM frequently control system.
Figure 14 is the output waveform figure of comparator C MP1 in the PWM clock generator in the slotting switch power converter of the pattern cascading PFC-PWM frequently control system.
Figure 15 is the output waveform figure of comparator C MP2 in the PWM clock generator in the slotting switch power converter of the pattern cascading PFC-PWM frequently control system.
Figure 16 is for inserting the clock waveform figure of PWM clock generator output in the frequency pattern cascading PFC-PWM switch power converter control system.
Embodiment
Below in conjunction with accompanying drawing content of the present invention is further specified.
The invention provides and insert pattern cascading PFC-PWM switch power converter control system frequently, its circuit structure is as shown in Figure 6, comprises PFC module 10, PWM module 11, PFC control signal generating module 12 and inserts pattern pwm control signal generation module 13 frequently:
Said PFC module 10; Adopt the rising edge modulation technique, carry out the conversion of alternating voltage, through first port one 20 and second port one, 22 incoming transport voltage VIN to direct voltage; Through first capacitor C, 1 output dc voltage; Be the output voltage of PFC module 10, the control signal SCV1 of first switches set controls first switches set adjustment input current, makes the waveform of the waveform of input current near input voltage; Even input voltage changes, the still stable set point that remains on of first capacitor C, 1 output dc voltage.
Said PWM module 11; Adopt the trailing edge modulation technique; The output voltage of said PFC module 10 is transformed into the output voltage VO UT of said control system, makes the output voltage OUT of said control system reach the setting dc voltage value, the input port of PWM module 11 connects the two ends of said first capacitor C 1; The control signal SCV2 control second switch group of second switch group; The output voltage OUT of said control system is through the 3rd port one 24 and 26 outputs of the 4th port one, and the two ends that said the 4th port one 26 connects second port one, 22, the second capacitor C 2 are connected said the 3rd port one 24 and the 4th port one 26;
Said PFC control signal generating module 12 produces the control signal of first switches set;
Said slotting frequency pattern pwm control signal generation module 13 produces the control signal of second switch group;
First switches set comprises first switch and second switch; The second switch group comprises the 3rd switch and the 4th switch;
When the oscillator triangular wave of PFC control signal generating module is lower than the output voltage error amplifier of PFC control signal generating module; The PFC control signal generating module is exported first control signal breaks off the switch of winning; Second switch conducting, first electric capacity begin charging; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator of PWM module produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch conduction, the 4th switch breaks off; During the no pulse clock signal, the 3rd switch breaks off, the 4th switch conduction; Thereby cause in the process of first electric capacity charging charging of second capacitance interval.
Said first switches set and said first capacitor C 1 that said PFC module comprises first inductance L 1, is made up of first switch SW 1, second switch SW2 and first reverser 138; First port one 20 of one termination input voltage of said first inductance L 1; Said first switch SW 1 and second switch SW2 of another termination of inductance L 1; Said first capacitor C 1 is connected between the other end of the other end and second switch SW2 of first switch SW 1; The first control signal SCV1 that the link of first switch SW 1 and first capacitor C 1 is connected second port one, 22, the first switch SW 1 produces the control signal SCV2 of second switch SW2 after through 138 anti-phases of first inverter.
Said second switch group and described second capacitor C 2 that said PWM module comprises second inductance L 2, is made up of the 3rd switch SW 3, the 4th switch SW 4 and second inverter 140; The 3rd switch SW 3 one ends serial connection second switch SW2; Another termination the 4th switch SW 4 and second inductance L 2 of the 3rd switch SW 3; Second capacitor C 2 is connected the other end of the 4th switch SW 4 and the other end of second inductance L 2; The second control signal SCV3 that the link of the 4th switch SW 4 and second capacitor C 2 is connected second port one, 22, the three switch SW 3 produces the control signal SCV4 of the 4th switch SW 4 after through inverter 140 anti-phases.
Said PFC control signal generating module comprises error amplifier 128, oscillator 150, comparator 130, first d type flip flop 132; The output voltage OUT of said control system is input to the positive input terminal of said error amplifier 128 through dividing potential drop; Reference voltage REF is input to the negative input end of error amplifier 128; Output termination comparator 130 positive input terminals of error amplifier; The triangular signal RAMP that oscillator 150 produces is input to the negative input end of comparator 130; The output of comparator 130 is received the data input pin D of first d type flip flop 132, and the clock CLK that oscillator 150 produces is input to the input end of clock of first d type flip flop 132, and the Q output of d type flip flop 132 produces the first switching signal SCV1;
Said slotting frequency pattern pwm control signal generation module 13 comprises PWM clock generator 134 and d type flip flop 136; The RAMP triangular wave of said oscillator 150 is input to the input of PWM clock generator 134; The output of PWM clock generator 134 is connected to the input end of clock of second d type flip flop 136; The output of comparator 130 is received the data input pin D of second d type flip flop 134, and the Q output of second d type flip flop 136 produces second switch signal SCV2.
The clock that said PWM clock generator produces is equivalent to traditional clock high level partly is divided into two the relation of RAMP and SCV1, SCV3, CLK, TMP0, TMP1, TMP2, CLK_PWM clock such as Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, Figure 15, shown in Figure 16.In practical application, the PWM clock generator can also partly be divided into traditional clock high level the pattern of multiple interval conducting.
The control method of aforesaid frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system comprises the steps:
(1) frequency interpolation pattern cascading off-line PFC-PWM switch power converter input ac voltage VIN, described PFC module 10, PWM module 11, PFC control signal generating module 12 and insert that pattern pwm control signal generation module 13 is in running order frequently;
(2) when the oscillator triangular wave is lower than output voltage error amplifier VEAO, the PFC control signal generating module is exported the first control signal SCV1 breaks off the switch SW 1 of winning, second switch SW2 conducting, and first capacitor C 1 begins charging; Insert frequency pattern pwm control signal generation module simultaneously and export the second control signal SCV2; Because the PWM clock generator produces two positive pulse clock signals in the charge cycle of first capacitor C 1: during the positive pulse clock signal; 3 conductings of the 3rd switch SW, the 4th switch SW 4 is broken off; During the no pulse clock signal, the 3rd switch SW 3 is broken off 4 conductings of the 4th switch SW; Thereby cause in the process of first capacitor C, 1 charging second capacitor C 2 charging at interval;
When (3) the oscillator triangular wave rose to greater than output voltage error amplifier VEAO, the PFC control signal generating module was exported the first control signal SCV1 and is made switch SW 1 conducting of winning, and second switch SW2 breaks off; Insert frequency pattern pwm control signal generation module simultaneously and export the second control signal SCV2; Because the PWM clock generator produces two positive pulse clock signals in the charge cycle of first capacitor C 1: during the positive pulse clock signal; The 3rd switch SW 3 is broken off; The 4th SW4 conducting, first capacitor C 1 is unsettled, 2 discharges of second capacitor C; During the no pulse clock signal, switch SW 3 conductings, SW4 breaks off, 1 discharge of first capacitor C, 2 chargings of second capacitor C.
The invention discloses and insert pattern cascading PFC-PWM switch power converter control system frequently, and illustrate and describe embodiment of the present invention and effect.What should be understood that is: the foregoing description is just to explanation of the present invention; Rather than limitation of the present invention; Any innovation and creation that do not exceed in the connotation scope of the present invention; Include but not limited to sample circuit modification, to the change of the local structure of circuit (as utilize those skilled in the art the oscillation module among thinkable technical method replacement the present invention; To replacing oscillator and being connected of PWM clock generator etc.), to the replacement (as first switch SW 1 is replaced with diode etc.) of the type or the model of components and parts, and the replacement of other unsubstantialities or modification all fall within the protection range of the present invention.
Claims (7)
1. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system is characterized in that comprising PFC module, PWM module, PFC control signal generating module and inserts pattern pwm control signal generation module frequently:
Said PFC module is carried out the conversion of alternating voltage to direct voltage, through first port and the second port incoming transport voltage VIN; Through the first electric capacity output dc voltage, i.e. the output voltage of PFC module, the control signal of first switches set is controlled first switches set adjustment input current; Make the waveform of the waveform of input current near input voltage; Even input voltage changes, the still stable set point that remains on of first capacitor C, 1 output dc voltage
Said PWM module; The output voltage of said PFC module is transformed into the output voltage of control system, makes the output voltage of said control system reach the setting dc voltage value, the input port of PWM module connects the two ends of said first electric capacity; The control signal control second switch group of second switch group; The output voltage of said control system is through the 3rd port and the output of the 4th port, and said the 4th port connects second port, and the two ends of second electric capacity are connected said the 3rd port and the 4th port;
Said PFC control signal generating module produces the control signal of first switches set;
Said slotting frequency pattern pwm control signal generation module produces the control signal of second switch group;
First switches set comprises first switch and second switch; The second switch group comprises the 3rd switch and the 4th switch;
When the oscillator triangular wave of PFC control signal generating module is lower than the output voltage error amplifier of PFC control signal generating module; The PFC control signal generating module is exported first control signal breaks off the switch of winning; Second switch conducting, first electric capacity begin charging; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator of PWM module produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch conduction, the 4th switch breaks off; During the no pulse clock signal, the 3rd switch breaks off, the 4th switch conduction; Thereby cause in the process of first electric capacity charging charging of second capacitance interval.
2. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system as claimed in claim 1; It is characterized in that said first switches set and said first electric capacity that said PFC module comprises first inductance, is made up of first switch, second switch and first reverser; First port of one termination input voltage of said first inductance; Said first switch of another termination of inductance and second switch; Said first electric capacity is connected between the other end of the other end and second switch of first switch; The link of first switch and first electric capacity is connected second port, and first control signal of first switch produces the control signal of second switch after through the first inverter anti-phase.
3. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system as claimed in claim 1; It is characterized in that said second switch group and described second electric capacity that said PWM module comprises second inductance, is made up of the 3rd switch, the 4th switch and second inverter; The 3rd switch one end serial connection second switch; Another termination the 4th switch and second inductance of the 3rd switch; Second electric capacity is connected the other end of the 4th switch and the other end of second inductance, and the link of the 4th switch and second electric capacity is connected second port, produces the control signal of the 4th switch after second control signal process inverter anti-phase of the 3rd switch.
4. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system as claimed in claim 1; It is characterized in that said PFC control signal generating module comprises error amplifier, oscillator, comparator, first d type flip flop; The output voltage of said control system is input to the positive input terminal of said error amplifier through dividing potential drop; Reference voltage is input to the negative input end of error amplifier; The output termination comparator positive input terminal of error amplifier, the triangular signal that oscillator produces is input to the negative input end of comparator, and the output of comparator is received the data input pin D of first d type flip flop; The clock that oscillator produces is input to the input end of clock of first d type flip flop, and the Q output of d type flip flop produces first switching signal.
5. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system as claimed in claim 4; It is characterized in that said slotting frequency pattern pwm control signal generation module comprises PWM clock generator and d type flip flop; The triangular wave of said oscillator is input to the input of PWM clock generator; The output of PWM clock generator is connected to the input end of clock of second d type flip flop; The output of comparator is received the data input pin D of second d type flip flop, and the Q output of second d type flip flop produces the second switch signal.
6. frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system as claimed in claim 5; It is characterized in that said PWM clock generator; Comprise second comparator, the 3rd comparator, the 4th comparator and logical circuit; The triangular wave of said oscillator is input to the positive input terminal of second comparator, the 3rd comparator, the 4th comparator respectively; The second threshold voltage VTH0, the 3rd threshold voltage VTH1, the 4th threshold voltage VTH2 are input to the negative input end of second comparator, the 3rd comparator, the 4th comparator respectively, and the output of second comparator, the 3rd comparator, the 4th comparator is connected to the input of logical circuit, and logical circuit carries out logical operation; Produce PWM clock CLK_PWM
The clock that said PWM clock generator produces is equivalent to traditional clock high level partly is divided into two.
7. like claim 1 or 2 or 3 or 4 or 5 or 6 described frequency interpolation pattern cascading off-line PFC-PWM switch power converter control system, it is characterized in that control method comprises the steps:
(1) frequency interpolation pattern cascading off-line PFC-PWM switch power converter input ac voltage VIN, described PFC module, PWM module, PFC control signal generating module and the slotting generation module of pattern pwm control signal frequently are in running order;
(2) when the oscillator triangular wave of PFC control signal generating module is lower than the output voltage error amplifier of PFC control signal generating module; The PFC control signal generating module is exported first control signal breaks off the switch of winning; Second switch conducting, first electric capacity begin charging; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator of PWM module produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch conduction, the 4th switch breaks off; During the no pulse clock signal, the 3rd switch breaks off, the 4th switch conduction; Thereby cause in the process of first electric capacity charging charging of second capacitance interval;
(3) when the oscillator triangular wave of PFC control signal generating module rose to the output voltage error amplifier greater than the PFC control signal generating module, the PFC control signal generating module was exported first control signal and is made the switch conduction of winning, and second switch breaks off; Insert frequency pattern pwm control signal generation module simultaneously and export second control signal; Because the PWM clock generator of PWM module produces two positive pulse clock signals in the charge cycle of first electric capacity: during the positive pulse clock signal; The 3rd switch breaks off; The 4th switch conduction, first electric capacity is unsettled, second capacitor discharge; During the no pulse clock signal, the 3rd switch conduction, the 4th switch breaks off, first capacitor discharge, the charging of second electric capacity.
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| CN103516202B (en) * | 2013-08-22 | 2016-01-06 | 西南交通大学 | The pulse ON/OFF control technology of Switching Power Supply and device thereof |
| JP6382059B2 (en) * | 2014-10-16 | 2018-08-29 | ローム株式会社 | Switching power supply circuit |
| CN104980011B (en) * | 2015-06-26 | 2017-12-15 | 深圳科士达科技股份有限公司 | A kind of method for reducing bus capacitor ripple |
| CN113517809B (en) * | 2021-04-25 | 2022-07-12 | 中国电子科技集团公司第五十八研究所 | Fast booster circuit and control method thereof |
| CN113938115B (en) * | 2021-10-18 | 2022-06-03 | 苏州聚元微电子股份有限公司 | Method for synchronizing clocks of switch type DC converter |
| CN116317584B (en) * | 2023-05-23 | 2023-08-01 | 合肥乘翎微电子有限公司 | A kind of control method of DC converter and PWM controller |
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