CN102136793B - Frequency generator and phase interleaving frequency synchronization device and method - Google Patents
Frequency generator and phase interleaving frequency synchronization device and method Download PDFInfo
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- CN102136793B CN102136793B CN201010000953.XA CN201010000953A CN102136793B CN 102136793 B CN102136793 B CN 102136793B CN 201010000953 A CN201010000953 A CN 201010000953A CN 102136793 B CN102136793 B CN 102136793B
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Abstract
The invention discloses a frequency generator and a phase interleaving frequency synchronization device and method so as to realize simple synchronization of translation frequency of interleaved phases in which the number of PWM (pulse-width modulation) regulators can be increased or reduced at will. The phase interleaving frequency synchronization device comprises a main frequency generator and a servant frequency generator which have different reference voltage, wherein the main frequency generator sends signals to the servant frequency generator to enable sawtooth wave signals of the two generators to be synchronized. The main frequency generator and the servant frequency generator can generate synchronized and interleaved-phase frequency according to individual reference voltage and the sawtooth wave signals.
Description
Technical field
The present invention relates to one and be applied to many pulse-width modulation (Pulse Width Modulation; PWM) phase cross-over frequency synchronization device and the method for adjuster power supply unit, particularly about the simple phase cross-over frequency synchronization device of one and method.
Background technology
As shown in Figure 1, multiple pwm modulator system comprises that multiple pwm modulators 10 are in order to input voltage vin is converted to output voltage V ol～VoN, and decoupling capacitance Cde connects voltage input end Vin in order to reduce the ripple of input voltage vin.Each pwm modulator 10 respectively comprises a PWM controller 12 and a power stage 14, PWM controller 12 in response to the frequency in each pwm modulator 10 (based on clock and frequency relation reciprocal each other, Frequency Synchronization is clock synchronous, therefore in Fig. 1 to Fig. 3, be all to illustrate to illustrate with clock) trigger pulse-width modulation signal PWM driving power level 14, so that input voltage vin is converted to output voltage.Because pwm modulator 10 has frequency separately, in the time that the frequency-splitting between these frequencies is between 20Hz～20KHz, can produce the noise that people's ear can be heard.
As shown in Figure 2, frequency of utilization synchronously can be improved the noise problem of multiple pwm modulator system.But, all pwm modulators 10 use same frequency, can trigger all pulse-width modulation signal PWM simultaneously, thereby cause input voltage vin to have large ripple, if the waveform 16 of Fig. 3 is shown in the time t1, this may cause pwm modulator 10 to be damaged and electromagnetic interference (ElectroMagnetic Interference; EMI) problem.
Although can reduce by strengthening decoupling capacitor Cde the ripple of input voltage vin, strengthening decoupling capacitor Cde can increase cost.The method that another kind improves input voltage vin ripple is to adopt staggered frequence synchronous, as shown in Figure 4 can storehouse client/server, provide servant's pwm modulator 22 required frequency CLK2～CLKN by main pwm modulator 20.The circuit of servant's pwm modulator 22 is as the pwm modulator 10 of Fig. 1, and main pwm modulator 20 more comprises the frequency CLK1 of the main pwm modulator 20 of phase shift control logic 24 translation and produces frequency CLK2～CLKN to servant's pwm modulator 22.Due to the phase place difference of frequency CLK1～CLKN, when therefore different, trigger all pulse-width modulation signal PWM, therefore the ripple of input voltage vin is less, as shown in the waveform 26 of Fig. 5.
At present existing many staggered phase shift frequency synchronization methods, for example U.S. Patent number 7,493,504 use phase-locked loop (PLL) and external setting-up to obtain out of phase, cause cost increase, and circuit are also more complicated but PLL is more expensive.U.S. Patent number 7,259,687 propose a kind of method of distributing phase place, its utilize main pwm modulator provide electric current to the resistance of multiple series connection to produce multiple voltage respectively to multiple servant's pwm modulators.Each servant's pwm modulator by the voltage of its reception and multiple default value comparison to determine the time of its relative position and startup, for example, if the voltage receiving is between first and second default value, the pwm modulator that represents this voltage of reception is first servant's pwm modulator, if the voltage receiving is between second and third default value, the pwm modulator that represents this voltage of reception is second servant's pwm modulator, by that analogy.But the quantity of default value has determined the maximum quantity of the pwm modulator that is suitable for the method.
Therefore, need to study a kind of simple and can increase and decrease arbitrarily the staggered phase shift frequency synchronization method of pwm modulator quantity.
Summary of the invention
Main purpose of the present invention is open a kind of frequency generator, phase cross-over frequency synchronization device and method, to realize simply and can increase and decrease arbitrarily the staggered phase shift Frequency Synchronization of pwm modulator quantity.
According to the present invention, a kind of frequency generator comprises that reference voltage generator connects the first input/output terminal of this frequency generator, after one main signal activation, produced one first reference voltage, sawtooth generator connects the second input/output terminal and this reference voltage generator of this frequency generator, after this main signal activation, produced a sawtooth signal to this second input/output terminal, and determine a first frequency according to this sawtooth signal and the first reference voltage, the the first comparator relatively signal in this first and second input/output terminal produces a comparison signal, the first pulse generator produces a second frequency according to this first comparison signal, and multiplexer connects this sawtooth generator and the first pulse generator, because should main signal selecting one of them output from this first frequency and second frequency.
According to the present invention, a kind of phase cross-over frequency synchronization device comprises basic frequency generator and servant's frequency generator, wherein this basic frequency generator comprises sawtooth generator, in order to sawtooth signal to be provided and to produce first frequency according to this sawtooth signal and the first reference voltage, this servant's frequency generator comprises the first comparator and produces one first comparison signal in order to compare one second reference voltage and this sawtooth signal, and the first pulse generator is synchronizeed with this first frequency according to this first comparison signal generation and the second frequency of phase cross-over.
According to the present invention, a kind of phase cross-over frequency synchronization method comprises provides a sawtooth signal, relatively the first reference voltage and this sawtooth signal produce the first comparison signal, determine first frequency according to this first comparison signal, relatively the second reference voltage and this sawtooth signal produce the second comparison signal, and determine to synchronize with this first frequency and the second frequency of phase cross-over according to this second comparison signal.
According to the present invention, a kind of frequency generator comprises that sawtooth generator connects the input/output terminal of this frequency generator, in order to sawtooth signal to be provided, determine a first frequency according to this sawtooth signal and one first reference voltage, and provide synchronous reset signal to this input/output terminal or according to this sawtooth signal of resetting of this synchronous reset signal in this input/output terminal according to main signal, reference voltage generator connects the input of this frequency generator, according to signal deciding one second reference voltage on this input, the first comparator connects this sawtooth generator and this reference voltage generator, relatively this sawtooth signal and the second reference voltage produce the first comparison signal, the first pulse generator produces second frequency according to this first comparison signal, and multiplexer connects this sawtooth generator and the first pulse generator, selects one of them output according to this main signal from this first frequency and second frequency.
According to the present invention, a kind of phase cross-over frequency synchronization device comprises basic frequency generator and servant's frequency generator, wherein this basic frequency generator comprises the first sawtooth generator, the synchronous reset signal that the first sawtooth signal is provided and synchronizes with this first sawtooth signal, and produce a first frequency according to this first sawtooth signal and one first reference voltage, this servant's frequency generator comprises the second sawtooth generator and determines this second sawtooth signal according to this synchronous reset signal, the first comparator relatively this second sawtooth signal and one second reference voltage produces the first comparison signal, and first pulse generator produce and synchronize with this first frequency and the second frequency of phase cross-over according to this first comparison signal.
According to the present invention, a kind of phase cross-over frequency synchronization method comprises the synchronous reset signal that the first sawtooth signal, the second sawtooth signal is provided and synchronizes with this first sawtooth signal, wherein this synchronous reset signal is in order to this second sawtooth signal of resetting, so that this second sawtooth signal is synchronizeed with this first sawtooth signal, produce first frequency according to this first sawtooth signal and the first reference voltage, and determine to synchronize with this first frequency and the second frequency of phase cross-over according to this second sawtooth signal and the second reference voltage.
Phase cross-over frequency synchronization device of the present invention is master-slave architecture, it utilizes basic frequency generator to send signal and produces to each servant's frequency, so that the sawtooth signal in this servant's frequency generator of this basic frequency generator and each synchronizes, this servant's frequency generator of this basic frequency generator and each produces and synchronizes and the frequency of phase cross-over according to reference voltage separately and sawtooth signal again.The present invention is without using PLL, therefore circuit is simpler, cost is also lower.
Brief description of the drawings
Fig. 1 is traditional multiple pwm modulator system;
Fig. 2 is the multiple pwm modulator system of existing Frequency Synchronization;
Fig. 3 is the oscillogram of Fig. 2 circuit;
Fig. 4 is the synchronous multiple pwm modulator system of existing staggered frequence;
Fig. 5 is the oscillogram of Fig. 4 circuit;
Fig. 6 is according to frequency generator of the present invention;
Fig. 7 is the first embodiment of application drawing 6 circuit;
Fig. 8 is the oscillogram of Fig. 7 circuit;
Fig. 9 is the second embodiment of application drawing 6 circuit;
Figure 10 is the 3rd embodiment of application drawing 6 circuit;
Figure 11 is according to another frequency generator of the present invention;
Figure 12 is the embodiment of application Figure 11 circuit; And
Figure 13 shows the waveform of signal in Figure 12.
Specific embodiment
Below in conjunction with Figure of description, the specific embodiment of the present invention is described in detail.Obviously, described embodiment is only a part of embodiment of the present invention, and other embodiment that those skilled in the art obtains under the prerequisite of not paying creative work, belongs to protection scope of the present invention.
Fig. 6 is according to frequency generator of the present invention.Reference voltage generator 32 connects input/output terminal IO2, after this reference voltage generator 32 is by main signal MST activation, produces reference voltage Vref to input/output terminal IO2.Sawtooth generator 34 connects input/output terminal IO1 and reference voltage generator 32, after sawtooth generator 34 is by main signal MST activation, produce sawtooth signal Vramp to input/output terminal IO1, and produce frequency CLK_master according to sawtooth signal Vramp and reference voltage Vref.The signal that comparator 36 compares input/output terminal IO1 and IO2 produces comparison signal Sc, and pulse generator 38 produces frequency CLK_slave according to comparison signal Sc.Multiplexer 40 is selected one of them output according to main signal MST from frequency CLK_master and CLK_slave.In this embodiment, when main signal MST is logic " 1 " time, reference voltage generator 32 and sawtooth generator 34 are enabled, and multiplexer 40 output frequency CLK_master; When main signal MST is logic " 0 " time, reference voltage generator 32 and sawtooth generator 34 anergies, and multiplexer 40 output frequency CLK_slave.
Fig. 7 is the phase cross-over frequency synchronization device of application drawing 6 circuit, wherein basic frequency generator 50 is that the circuit of Fig. 6 is logic at main signal MST " 1 " time equivalent electric circuit, servant's frequency generator 54 and 56 is that the circuit of Fig. 6 is logic at main signal MST " 0 " time equivalent electric circuit.In basic frequency generator 50, sawtooth generator 34 comprise charge-discharge circuit 60 provide sawtooth signal Vramp to comparator 62 and through the input/output terminal IO1 of basic frequency generator 50 to servant's frequency generator 54 and 56.Charge-discharge circuit 60 comprises that capacitor C 1 connects the input/output terminal IO1 of basic frequency generator 50, and current source Im connects with capacitor C 1, and switch SW 1 is in parallel with capacitor C 1.Can control discharging and recharging of capacitor C 1 by diverter switch SW1, and then determine sawtooth signal Vramp.Comparator 62 comparison reference voltage Vref and sawtooth signal Vramp and produce comparison signal Sm, pulse generator 64 produces control signal Sp according to comparison signal Sm and supplies with diverter switch SW1, and pulse generator 66 produces frequency CLK_master according to comparison signal Sm.In basic frequency generator 50, the reference voltage Vref being provided by reference voltage generator 32 is supplied to bleeder circuit 52 through the input/output terminal IO2 of basic frequency generator 50.Bleeder circuit 52 comprises three resistance R of connecting and having equal resistors value, produces reference voltage Vref 1 and Vref2 is supplied to respectively the input/output terminal IO2 of servant's frequency generator 54 and the input/output terminal IO2 of servant's frequency generator 56 with reference to voltage Vref dividing potential drop.The input/output terminal IO1 of the input/output terminal IO1 of servant's frequency generator 54 and servant's frequency generator 56 is all connected to the input/output terminal IO1 of basic frequency generator 50 to receive sawtooth signal Vramp.In servant's frequency generator 54, comparator 36 is relatively fallen forward the input/output terminal IO1 of frequency generator 54 and the sawtooth signal Vramp of IO2 and reference voltage Vref 1 and is produced comparison signal Sc1, and pulse generator 38 produces frequency CLK_slave1 according to comparison signal Sc1.In servant's frequency generator 56, comparator 36 is relatively fallen forward the input/output terminal IO1 of frequency generator 56 and the sawtooth signal Vramp of IO2 and reference voltage Vref 2 and is produced comparison signal Sc2, and pulse generator 38 produces frequency CLK_slave2 according to comparison signal Sc2.Being connected to the input/output terminal IO1 of servant's frequency generator 54 and 56 and capacitor C 2, C3, C4 and the C5 of IO2 is the shake (jitter) for reducing sawtooth signal Vramp and reference voltage Vref 1 and Vref2.Capacitor C 2, C3, C4 and C5 can be the parasitic capacitance of wire.
Fig. 8 is the oscillogram of Fig. 7 circuit.With reference to Fig. 7 and Fig. 8, in basic frequency generator 50, in the time that sawtooth signal Vramp is greater than reference voltage Vref, shown in time t1, pulse generator 66 trigger rate CLK_master, it is that the control signal Sp of tP is with replacement sawtooth signal Vramp that pulse generator 64 also produces the operating time.In servant's frequency generator 54, in the time that sawtooth signal Vramp is greater than reference voltage Vref 1, shown in time t3, servant's frequency generator 54 trigger rate CLK_slave1.In servant's frequency generator 56, in the time that sawtooth signal Vramp is greater than reference voltage Vref 2, shown in time t2, servant's frequency generator 56 trigger rate CLK_slave2.In this embodiment, because basic frequency generator 50 and servant's frequency generator 54 and 56 are shared sawtooth signal Vramp, therefore frequency CLK_master, CLK_slave1 and CLK_slave2 are synchronous, reference voltage Vref 1 is reference voltage Vref 2/3rds again, reference voltage Vref 2 is reference voltage Vref 1/3rd, and therefore the phase place of frequency CLK_master, CLK_slave1 and CLK_slave2 respectively differs 120 °.In the time will increasing the quantity of servant's frequency generator, as long as increase the quantity of series resistance can produce different levels in bleeder circuit 52 reference voltage to servant's frequency generator, and then obtain the frequency of phase cross-over.For example, to in the circuit of Fig. 7, increase servant's frequency generator, can in bleeder circuit 52, increase a series resistance R with equal resistors value, to provide reference voltage to newly-increased servant's frequency generator, therefore the phase difference between each frequency is 360 °/4=90 °.According to the present invention, phase cross-over frequency synchronization device can increase and decrease arbitrarily servant's frequency generator, and the multiple pwm modulator system of therefore applying this phase cross-over frequency synchronization device can increase and decrease arbitrarily the quantity of pwm modulator on demand.In other embodiments, bleeder circuit 52 also can use the resistance with different resistance values to be composed in series.
Produce reference voltage Vref 1 and Vref2 a lot of to the method for servant's frequency generator 54 and 56, not necessarily will utilize the reference voltage Vref of basic frequency generator 50 to produce.Fig. 9 is another two embodiment of application drawing 6 circuit, and it is to provide respectively the reference voltage Vref 1 of different levels and Vref2 to servant's frequency generator 54 and 56 by two bleeder circuits 70 and 72.Bleeder circuit 70 comprises that the resistance R 11 of pair of series and R12 are with reference to voltage Vref3 dividing potential drop, and bleeder circuit 72 comprises that the resistance R 21 of pair of series and R22 are with reference to voltage Vref3 dividing potential drop.Figure 10 is the 3rd embodiment of application drawing 6 circuit, and it is to utilize current source I1 and I2 and resistance R 1 and R2 generation reference voltage Vref 1 and Vref2.Resistance R 1 connects the input/output terminal IO2 of servant's frequency generator 54, produce reference voltage Vref 1 because of the electric current that current source I1 provides, resistance R 2 connects the input/output terminal IO2 of servant's frequency generator 56, produces reference voltage Vref 2 because of the electric current that current source I2 provides.
Figure 11 is according to another frequency generator of the present invention, after main signal MST activation, reference voltage generator 32 is according to the signal deciding reference voltage Vps of input Iset, and sawtooth generator 34 provides sawtooth signal Vramp and produces frequency CLK_master according to sawtooth signal Vramp and inner reference voltage Vref thereof.Sawtooth generator 34 also determines whether provide synchronous reset signal Ssync to input/output terminal IO1 according to main signal MST.Comparator 36 is sawtooth signal Vramp and reference voltage Vps generation comparison signal Sc relatively, and pulse generator 38 produces frequency CLK_slave according to comparison signal Sc, and multiplexer 40 determines output frequency CLK_master or CLK_slave according to main signal MST.In this embodiment, when main signal MST is logic " 1 " time, sawtooth generator 34 provides synchronous reset signal Ssync to input/output terminal IO1, and multiplexer 40 output frequency CLK_master.When main signal MST is logic " 0 " time, reference voltage generator 32 is enabled, multiplexer 40 output frequency CLK_slave.
Figure 12 is the phase cross-over frequency synchronization device of application Figure 11 circuit, and it comprises basic frequency generator 74 and servant's frequency generator 76.In this embodiment, sawtooth generator 34 comprises that charge-discharge circuit 60 provides sawtooth signal Vramp, comparator 62 comparison reference voltage Vref and sawtooth signal Vramp produce comparison signal Sm, pulse generator 66 produces frequency CLK_master and CLK_S according to comparison signal Sm, sync driver 78 produces synchronous reset signal Ssync to input/output terminal IO1 according to frequency CLK_S after by main signal MST activation, and logical circuit 80 drives charge-discharge circuit 60 according to the synchronous reset signal Ssync of frequency CLK_S or input/output terminal IO1.Charge-discharge circuit 60 comprises capacitor C 1, and current source Im connects with capacitor C 1, switch SW 1 be controlled by logical circuit 80 in parallel with capacitor C 1.Logical circuit 80 comprises switch SW 2 and or door 82.Or the output connecting valve SW1 of door 82, first input end receive frequency CLK_S, the second input connects input/output terminal IO1 through switch SW 2.In basic frequency generator 74, main signal MST is logic " 1 ", therefore switch SW 2 is open circuit (off), logical circuit 80 drives charge-discharge circuit 60 to produce sawtooth signal Vramp according to frequency CLK_S, multiplexer 40 is selected output frequency CLK_master, and sync driver 78 produces synchronous reset signal Ssync to servant's frequency generator 76.In servant's frequency generator 76, main signal MST is logic " 0 ", therefore reference voltage generator 32 is enabled and produces reference voltage Vps according to the signal Sext of input Iset, switch SW 2 closed circuit (on) makes logical circuit 80 drive charge-discharge circuit 60 to produce sawtooth signal Vramp according to the synchronous reset signal Ssync of input/output terminal IO1, and multiplexer 40 is selected output frequency CLK_slave.
Figure 13 shows the waveform of signal in Figure 12, wherein waveform 84 is the sawtooth signal Vramp in basic frequency generator 74, waveform 86 is synchronous reset signal Ssync, waveform is frequency CLK_master, waveform 90 is the sawtooth signal Vramp in servant's frequency generator 76, waveform 92 is reference voltage Vps, and waveform 94 is frequency CLK_slave.With reference to Figure 12 and Figure 13, in the time that the sawtooth signal Vramp in basic frequency generator 74 is greater than reference voltage Vref, as shown in waveform 84 and time t4, synchronous reset signal Ssync and frequency CLK_master are triggered, as shown in waveform 86 and 88, fall forward frequency generator 76 according to synchronous reset signal Ssync its sawtooth signal Vramp that resets simultaneously, as shown in waveform 90, synchronous reset signal Ssync synchronously resets the sawtooth signal Vramp in basic frequency generator 74 and servant's frequency generator 76, and therefore both sawtooth signal Vramp are synchronous; In addition the current source Im of the charge-discharge circuit 60 in both is identical, therefore both produce identical sawtooth signal Vramp, in the time that the sawtooth signal Vramp in basic frequency generator 76 is greater than reference voltage Vps, frequency CLK_slave is triggered, as shown in waveform 94 and time t5, due to the level difference of reference voltage Vref and Vps, therefore basic frequency generator 74 and servant's frequency generator 76 produce synchronously but frequency CLK_master and the CLK_slave of out of phase.This embodiment can increase servant's frequency generator 76 on demand, as long as set in each servant's frequency generator 76 reference voltage Vps in different levels, just can produce multiple synchronous but frequency CLK_slave of phase cross-over.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (20)
1. a frequency generator, is characterized in that, comprising:
The first input/output terminal;
The second input/output terminal;
Reference voltage generator connects this first input/output terminal, is produced the first reference voltage after main signal activation;
Sawtooth generator connects this second input/output terminal and reference voltage generator, is produced sawtooth signal to this second input/output terminal after this main signal activation, and determines first frequency according to this sawtooth signal and the first reference voltage;
The first comparator connects this first and second input/output terminal, and relatively the signal of this first and second input/output terminal produces the first comparison signal;
The first pulse generator connects this first comparator, produces second frequency according to this first comparison signal; And
Multiplexer connects this sawtooth generator and the first pulse generator, because should main signal selecting one of them output from this first and second frequency.
2. frequency generator as claimed in claim 1, is characterized in that, this first reference voltage supplies is given this first input/output terminal.
3. frequency generator as claimed in claim 1, is characterized in that, this sawtooth generator comprises:
Charge-discharge circuit connects this second input/output terminal, in order to this sawtooth signal to be provided;
The second comparator connects this charge-discharge circuit and reference voltage generator, relatively this sawtooth signal and the first reference voltage and produce the second comparison signal;
The second pulse generator connects this second comparator, produces this first frequency according to this second comparison signal; And
The 3rd pulse generator connects this second comparator and charge-discharge circuit, produces control signal drive this charge-discharge circuit according to this second comparison signal.
4. a phase cross-over frequency synchronization device, is characterized in that, comprising:
Basic frequency generator, comprises:
Sawtooth generator, in order to provide sawtooth signal and to produce first frequency according to this sawtooth signal and the first reference voltage; And
At least one servant's frequency generator, each this servant's frequency generator comprises:
The first comparator connects this sawtooth generator, and relatively the second reference voltage and this sawtooth signal produce the first comparison signal; And
The first pulse generator connects this first comparator, produces and synchronizes with this first frequency and the second frequency of phase cross-over according to this first comparison signal.
5. phase cross-over frequency synchronization device as claimed in claim 4, is characterized in that, more comprises that bleeder circuit connects this first comparator, produces this second reference voltage in order to this first reference voltage of dividing potential drop.
6. phase cross-over frequency synchronization device as claimed in claim 4, is characterized in that, more comprises that bleeder circuit connects this first comparator, produces this second reference voltage in order to dividing potential drop the 3rd reference voltage.
7. phase cross-over frequency synchronization device as claimed in claim 4, is characterized in that, more comprises:
Resistance connects this first comparator; And
Current source connects this resistance, provide electric current to this resistance to produce this second reference voltage.
8. phase cross-over frequency synchronization device as claimed in claim 4, is characterized in that, this sawtooth generator comprises:
Charge-discharge circuit, in order to provide this sawtooth signal;
The second comparator connects this charge-discharge circuit, relatively this sawtooth signal and this first reference voltage and produce the second comparison signal;
The second pulse generator connects this second comparator, produces this first frequency according to this second comparison signal; And
The 3rd pulse generator connects this second comparator and charge-discharge circuit, produces control signal drive this charge-discharge circuit according to this second comparison signal.
9. a phase cross-over frequency synchronization method, is characterized in that, comprises the following steps:
(a) provide sawtooth signal;
(b) compare the first reference voltage and this sawtooth signal and produce the first comparison signal;
(c) determine first frequency according to this first comparison signal;
(d) compare the second reference voltage and this sawtooth signal and produce the second comparison signal; And
(e) determine to synchronize with this first frequency according to this second comparison signal and the second frequency of phase cross-over.
10. phase cross-over frequency synchronization method as claimed in claim 9, is characterized in that, more comprises this first reference voltage of dividing potential drop and produces this second reference voltage.
11. phase cross-over frequency synchronization methods as claimed in claim 9, is characterized in that, more comprise dividing potential drop the 3rd reference voltage and produce this second reference voltage.
12. phase cross-over frequency synchronization methods as claimed in claim 9, is characterized in that, more comprise electric current is injected to resistance to produce this second reference voltage.
13. phase cross-over frequency synchronization methods as claimed in claim 9, is characterized in that, more comprise discharging and recharging to produce this sawtooth signal according to this first comparison signal control capacitance.
14. 1 kinds of frequency generators, is characterized in that, comprising:
Input;
Input/output terminal;
Sawtooth generator connects this input/output terminal, in order to sawtooth signal to be provided, determine first frequency according to this sawtooth signal and the first reference voltage, and provide synchronous reset signal to this input/output terminal or according to this synchronous reset signal of this input/output terminal this sawtooth signal of resetting according to main signal;
Reference voltage generator connects this input, according to signal deciding second reference voltage of this input;
The first comparator connects this sawtooth generator and this reference voltage generator, relatively this sawtooth signal and the second reference voltage and produce the first comparison signal;
The first pulse generator connects this first comparator, produces second frequency according to this first comparison signal; And
Multiplexer connects this sawtooth generator and the first pulse generator, selects one of them output according to this main signal from this first and second frequency.
15. frequency generators as claimed in claim 14, is characterized in that, this sawtooth generator comprises:
Charge-discharge circuit, produces this sawtooth signal;
The second comparator connects this charge-discharge circuit, relatively this sawtooth signal and the first reference voltage and produce the second comparison signal;
The second pulse generator connects this second comparator, produces this first frequency and the 3rd frequency according to this second comparison signal;
Sync driver connects this second pulse generator and this input/output terminal, after by this main signal activation, produces this synchronous reset signal according to the 3rd frequency; And
Logical circuit connects this charge-discharge circuit, the second pulse generator and input/output terminal, drives this charge-discharge circuit according to the synchronous reset signal of the 3rd frequency or this input/output terminal.
16. 1 kinds of phase cross-over frequency synchronization devices, is characterized in that, comprising:
Basic frequency generator, comprises:
The first sawtooth generator, the synchronous reset signal that the first sawtooth signal is provided and synchronizes with this first sawtooth signal, and produce first frequency according to this first sawtooth signal and the first reference voltage; And
At least one servant's frequency generator, each this servant's frequency generator comprises:
The second sawtooth generator connects this first sawtooth generator, and the second sawtooth signal is provided, and according to this synchronous reset signal this second sawtooth signal of resetting;
The first comparator connects this second sawtooth generator, and relatively this second sawtooth signal and the second reference voltage produce the first comparison signal; And
The first pulse generator connects this first comparator, produces and synchronizes with this first frequency and the second frequency of phase cross-over according to this first comparison signal.
17. phase cross-over frequency synchronization devices as claimed in claim 16, is characterized in that, this first sawtooth generator comprises:
Charge-discharge circuit, produces this first sawtooth signal;
The second comparator connects this charge-discharge circuit, relatively this first sawtooth signal and the first reference voltage and produce the second comparison signal;
The second pulse generator connects this second comparator, produces this first frequency and the 3rd frequency according to this second comparison signal;
Sync driver connects this second pulse generator, produces this synchronous reset signal according to the 3rd frequency; And
Logical circuit connects this charge-discharge circuit and the second pulse generator, according to the 3rd this charge-discharge circuit of frequency drives.
18. phase cross-over frequency synchronization devices as claimed in claim 16, is characterized in that, this second sawtooth generator comprises:
Charge-discharge circuit, produces this second sawtooth signal; And
Logical circuit connects this charge-discharge circuit and the raw device of the first sawtooth waveforms, drives this charge-discharge circuit according to this synchronous reset signal.
19. 1 kinds of phase cross-over frequency synchronization methods, is characterized in that, comprise the following steps:
(a) the synchronous reset signal that the first sawtooth signal, the second sawtooth signal is provided and synchronizes with this first sawtooth signal, this synchronous reset signal is in order to this second sawtooth signal of resetting, so that this second sawtooth signal is synchronizeed with this first sawtooth signal;
(b) produce first frequency according to this first sawtooth signal and the first reference voltage; And
(c) determine to synchronize with this first frequency according to this second sawtooth signal and the second reference voltage and the second frequency of phase cross-over.
20. phase cross-over frequency synchronization methods as claimed in claim 19, is characterized in that, this step a comprises:
Relatively this first sawtooth signal and the first reference voltage produce comparison signal;
Produce the 3rd frequency according to this comparison signal;
Produce this synchronous reset signal and determine this first sawtooth signal according to the 3rd frequency; And
According to this synchronous reset signal this second sawtooth signal of resetting.
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| US8791676B2 (en) * | 2011-09-30 | 2014-07-29 | Monolithic Power Systems, Inc. | Reference adjusting power supply for processor and control method thereof |
| EP3229357B1 (en) * | 2016-04-08 | 2020-08-19 | Nxp B.V. | Charge pump with reference voltage modification for avoiding specific frequencies |
| WO2020172810A1 (en) * | 2019-02-27 | 2020-09-03 | Texas Instruments Incorporated | Dc-dc converter system with configurable phase shift synchronization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004328964A (en) * | 2003-04-28 | 2004-11-18 | Ricoh Co Ltd | Voltage step-up/step-down dc-dc converter |
| CN101078940A (en) * | 2006-05-26 | 2007-11-28 | 硕颉科技股份有限公司 | Reference voltage generator, frequency generator and controller |
| CN101599692A (en) * | 2008-06-04 | 2009-12-09 | 立锜科技股份有限公司 | The quick response device of switch type power converter and method |
| CN101599693A (en) * | 2008-06-04 | 2009-12-09 | 立锜科技股份有限公司 | The quick response device of switch type power converter and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004328964A (en) * | 2003-04-28 | 2004-11-18 | Ricoh Co Ltd | Voltage step-up/step-down dc-dc converter |
| CN101078940A (en) * | 2006-05-26 | 2007-11-28 | 硕颉科技股份有限公司 | Reference voltage generator, frequency generator and controller |
| CN101599692A (en) * | 2008-06-04 | 2009-12-09 | 立锜科技股份有限公司 | The quick response device of switch type power converter and method |
| CN101599693A (en) * | 2008-06-04 | 2009-12-09 | 立锜科技股份有限公司 | The quick response device of switch type power converter and method |
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