CN101388603B - Method and apparatus for regulating power source voltage - Google Patents
Method and apparatus for regulating power source voltage Download PDFInfo
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- CN101388603B CN101388603B CN2007101453808A CN200710145380A CN101388603B CN 101388603 B CN101388603 B CN 101388603B CN 2007101453808 A CN2007101453808 A CN 2007101453808A CN 200710145380 A CN200710145380 A CN 200710145380A CN 101388603 B CN101388603 B CN 101388603B
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Abstract
The invention discloses a device for adjusting power supply voltage, which comprises a current supply module, a control circuit module, a conversion module and a charged module, wherein the current supply module is used to generate electric current, the control circuit module is used to send switch signals according to sending intervals, the conversion module is used to chop the electric current into pulse current according to the switch signals, the pulse current is used to charge and discharge electricity to the charged module, the charged module is used to charge or discharge electricity to the charged module through the pulse electricity to form output voltage, and the problem in the prior art that the voltage adjusting pressure is slow is solved through the device. The invention also discloses a method for adjusting the power supply voltage simultaneously.
Description
Technical field
The present invention relates to the circuit engineering field, particularly a kind of method and device of regulating supply voltage.
Background technology
At present, power amplifier is divided into two types of Linear Power Amplifier and non-linear power amplifiers in the circuit engineering field.Linear Power Amplifier is difficult for producing harmonic wave, and signal is true to nature, the main Linear Power Amplifier that adopts in high end audio.But Linear Power Amplifier efficient is low, requires can adopt non-linear power amplifier, such as the D class audio frequency power amplifier that is developing than higher occasion for efficient.Non-linear power amplifier mainly adopts pulse width modulation (PWM) technology to realize power amplification, can obtain very high efficient.
In wireless domain, the broadband is growing, and transmitting no longer is the constant amplitude signal.In order to improve the utilance of frequency spectrum resource; The broadband connections modulation generally is non-constant envelope modulation, and the amplitude that is to say radio frequency is time dependent, in order to guarantee the true to nature of amplitude information; Prevent to produce the Harmonic Interference adjacent channel, power amplifier is generally operational in linear mode.Because the variation of amplitude, the efficient of power amplifier is lower.So generally the supply power voltage through the dynamic adjustments power amplifier improves power amplification efficiency, to reach energy-conservation purpose.Envelope-tracking (ET) technology in the radio frequency amplifying technique that Here it is, and envelope is eliminated and (EER) technology of recovery.Because amplitude changes in time, when amplitude variations when very low, the utilance of power supply is very low, because the supply voltage major part all is added in the drain electrode of power tube, has become thermal losses.The basic thought of ET technology is: when amplitude diminishes, let supply power voltage also and then diminish, the voltage in the drain electrode is reduced, thereby reduce thermal losses, improve power amplification efficiency.In the ET technology, power amplifier is a linear work, and the power amplifier of EER then works in on-off modes such as E class, F class; Envelope information then all adds to power supply; Carry whole amplitude informations by power supply, as long as the efficient of power supply itself is very high, the whole efficiency of EER power amplifier will be very high so.
As shown in Figure 1, prior art is regulated in the apparatus structure sketch map of supply voltage, and 2. the input power supply Vin that is 1. produced by voltage source exports a pulse voltage series Vo1 in the back through the switch change-over link; Again through a LC filtering link 3. Vo1 filters into a level and smooth voltage Vo who the is different from Vin oscillogram of each signal shown in Figure 2 (specifically referring to) to pulse voltage; In order to control this output voltage, also have a control circuit 4., 4. control circuit samples to output voltage V o; Signal according to the sampling acquisition; Judge the normal voltage whether output voltage suits the requirements, as do not meet, then according to the difference of output voltage and normal voltage; Through the 2. width of regulating impulse Vo1 of switch change-over link, thereby output voltage is equated with normal voltage.
But existing Switching Power Supply is because there is LC second-order inertia link, and the phase lag maximum can reach 180 degree in theory, though because of capacitor equivalent series resistance (ESR) is arranged under the actual conditions, so can not reach 180 degree.If but add inverting amplifier, often the phase shift meeting surpasses 180 degree when frequency is higher, like this when high frequency; Total phase shift is easy to reach 360 degree; Therefore can only reduce high-frequency gain and guarantee that circuit is stable, this has just limited the raising of pressure regulation speed, so just can only satisfy low frequency ET and EER; When frequency raise, the supply voltage governing speed did not catch up with.
In sum, the device of regulating supply voltage at present can not satisfy the occasion that requires at a high speed on the speed of pressure regulation.
Summary of the invention
The embodiment of the invention provides a kind of method and device of regulating supply voltage, in order to solve the slow-footed problem of pressure regulation that prior art exists.
A kind of adjusting supply voltage device that the embodiment of the invention provides comprises: current source module, control circuit module, modular converter and be recharged module, wherein:
Said current source module is used to produce electric current;
Said control circuit module is used for according to sending transmit button signal blanking time;
Said modular converter is used for according to said switching signal said current chopping being become pulse current, and said pulse current discharges and recharges the said module that is recharged;
The said module that is recharged is used for through said pulse current the said module that is recharged being discharged and recharged, and forms output voltage.
A kind of method of regulating supply voltage that the embodiment of the invention provides comprises:
Produce electric current;
According to sending transmit button signal blanking time;
According to said switching signal, said current chopping is become pulse current, said pulse current discharges and recharges electric capacity, forms output voltage.
A kind of adjusting supply voltage method and device that the embodiment of the invention provides have been accelerated the speed of pressure regulation, thereby have satisfied the occasion that requires at a high speed, eliminated harmonic oscillation, have improved whole efficiency and stability.
Description of drawings
Fig. 1 regulates the apparatus structure sketch map of supply voltage for prior art;
Fig. 2 is the waveform sketch map of each signal in the device of prior art adjusting supply voltage;
Fig. 3 A is the structural representation that the embodiment of the invention is regulated the supply voltage device;
Fig. 3 B is the waveform sketch map that the embodiment of the invention is regulated each signal in the supply voltage device;
Fig. 4 regulates the method flow sketch map of supply voltage for the embodiment of the invention;
Fig. 5 A is that embodiment of the invention adjusting supply voltage device is the structural representation one of H bridge switch circuit;
Fig. 5 B is that the embodiment of the invention is regulated the switching waveform sketch map in the supply voltage device;
Fig. 5 C is the radiofrequency signal sketch map that the embodiment of the invention is regulated the supply voltage device;
Fig. 5 D is that embodiment of the invention adjusting supply voltage device is a bridge architecture sketch map two;
Fig. 5 E is the current waveform sketch map that embodiment of the invention supply voltage device adopts forward converter;
Fig. 5 F is that embodiment of the invention adjusting supply voltage device is a bridge architecture sketch map three;
Fig. 6 A is that embodiment of the invention adjusting supply voltage device is non-bridge architecture sketch map one;
Fig. 6 B is that embodiment of the invention adjusting supply voltage device is non-bridge architecture sketch map two;
Fig. 6 C is that embodiment of the invention adjusting supply voltage device is non-bridge architecture sketch map three.
Embodiment
To the slow-footed problem of the pressure regulation that exists in the prior art; A kind of adjusting supply voltage device that the embodiment of the invention provides; This device comprises: current source module, control circuit module, modular converter and be recharged module, and wherein: said current source module is used to produce electric current; Said control circuit module is used for according to sending transmit button signal blanking time; Said modular converter is used for according to said switching signal said current chopping being become pulse current, and said pulse current discharges and recharges the said module that is recharged; The said module that is recharged; Be used for the said module that is recharged being discharged and recharged, form output voltage, owing to be that electric capacity is discharged and recharged through said pulse current; Thereby avoided because of LC filter self character caused when frequency raises, the problem that the supply voltage governing speed does not catch up with.
In embodiments of the present invention: change input source of the prior art into electric current from voltage, and filtering is accomplished by electric capacity, so just do not had the LC second-order inertia; Only have filter capacitor, phase lag is 90 degree to the maximum, and phase margin is big; It is very big to make that loop gain can be done; Bandwidth can be done very highly, and reaction speed can be very fast, therefore can realize very high pressure regulation speed.When using the ring that stagnates to control, except the time-delay (generally being no more than 50ns) of switching device, almost time-delay produces.
Owing to do not have magnetic core in the filter, so can not produce core loss, and there is not inductance in the filter, the inductance phenomenon of uttering long and high-pitched sounds can not take place, and subharmonic oscillation can not take place, compare prior art and have higher bandwidth.
Below in conjunction with Figure of description the present invention is described in further detail.
Shown in Fig. 3 A, the embodiment of the invention is regulated the supply voltage device and is comprised: current source module 10, control circuit module 20, modular converter 30 be recharged module 40.
Current source module 10 is used to produce electric current (Iin).
Wherein, the electric current of current source module 10 generations can be constant current or time-varying current.
Control circuit module 20, be used for according to transmission blanking time of setting to modular converter 30 transmit button signals.
Wherein, Control circuit module 20 is also further sampled to the output voltage (Vo) that is recharged module 40; At the absolute value of output voltage (Vo) and normal voltage (Vins or the voltage that is directly proportional with Vins) difference during greater than threshold value, the transmission blanking time that adjustment is set.
Wherein, sending blanking time is the time of the twice transmit button signal in control circuit module 20 front and back.
Control circuit module 20 can be an integrated circuit, also can be made up of the components and parts that separate.
Modular converter 30 is used for according to the switching signal from control circuit module 20 electric current (Iin) being chopped into a pulse current (Io1).
Wherein, the pulse current that is chopped into is a kind of in the impulse wave of pulse-width modulation (PWM) ripple, pulse frequency modulation (PFM) ripple or the ring modulation that stagnates.
Wherein, modular converter 30 can adopt a kind of in isolated topology or the non-isolated topology.
Further, if isolated topology, then include but not limited to a kind of in the following form: normal shock, double tube positive exciting, recommend, half-bridge, full-bridge or the like.
If be non-isolated topology, then include but not limited to a kind of in the following form: buck converter (Buck), booster converter (Boost), bridge circuit or the like.
In switching technique, can also adopt soft switch technique.
Be recharged module 40, be used for the said module that is recharged being discharged and recharged, form output voltage (Vo) through said pulse current.
Wherein, be recharged module 40 and can be the strong low ESR electric capacity of anti-ripple ability or other have the electric capacity of identical characteristics, the capacity of electric capacity can be regulated as required, and very high if desired pressure regulation speed then can be used the less electric capacity of capacity; Otherwise pressure regulation speed if desired is not very high, then can increase the capacity of electric capacity.
The electric current that current source module 10 produces, the pulse current that modular converter 30 is chopped into and be recharged the voltage that module 40 forms can be referring to the signal waveforms shown in Fig. 3 B.
Be recharged module 40 short circuits in order to prevent when discharging and recharging conversion, might cause; Can also in modular converter 30, set Dead Time, then modular converter 30 need stop charging operations when being charged to the discharge conversion; Through behind the Dead Time, carry out discharge operation again; Accordingly, modular converter 30 need stop discharge operation when discharging into the charging conversion, through behind the Dead Time, carry out charging operations again.
In Dead Time, current source module 10 also can provide electric current, then regulates the supply voltage device and can further include: protection module 50.
Protection module 50 is connected with modular converter 30 with current source module 10, is used for after 30 pairs of modular converters are recharged module 40 and carry out charge or discharge conversions storage or discharge the energy that current source module 10 produces in the Dead Time.
Normal voltage can be the control circuit module 20 inner voltages of preserving, and can also be the voltage that inputs to control circuit module 20 from the outside.
If the outside voltage that inputs to control circuit module 20 is the RF envelope signal, then is recharged module 40 voltage is exported to RF power amplification.
If the outside voltage that inputs to control circuit module 20 is audio signal, then is recharged module 40 voltage is exported to loud speaker.
As shown in Figure 4, the method that the embodiment of the invention is regulated supply voltage comprises the following steps:
Step a100, generation electric current.
Wherein, this electric current can be constant current or time-varying current.
Step a101, according to sending transmit button signal blanking time;
Step a102, according to this switching signal, current chopping is become pulse current, through this pulse current electric capacity is discharged and recharged, form output voltage.
Wherein, this pulse current that is chopped into can be a kind of in the impulse wave of pulse width modulated wave, pulse frequency modulation ripple or the ring modulation that stagnates.
It is through adopting a kind of realization the in isolated topology or the non-isolated topology that pulse current discharges and recharges electric capacity.
Wherein, can further include after the step a102:
Output voltage is sampled, during greater than threshold value, adjust the time that said pulse current discharges and recharges electric capacity at the absolute value of voltage and the normal voltage difference of sampling.
Further, normal voltage is voltage that is provided with in advance or the normal voltage of importing from the outside.
If the normal voltage of outside input is a radiofrequency signal, then the voltage that forms is exported to RF power amplification;
If the normal voltage of outside input is an audio signal, then the voltage that forms is exported to loud speaker.
Suppose that the present charging interval is 3us, be 2us discharge time:
If only adjust duty ratio, do not adjust frequency, it is constant then to discharge and recharge total time, only adjustment charging and discharge time, such as the adjustment charging interval be 2us.Be 3us discharge time;
If only adjust frequency, do not adjust duty ratio, then make charging and the constant rate of discharge time, adjust and discharge and recharge total time, such as the charging interval be 6us, be 4us discharge time;
If adjustment duty ratio and frequency then discharge and recharge and change total time, the ratio of charging and discharge time also changes, such as the charging interval be 4us, be 3us discharge time.
Further,, can also set Dead Time, then in the step 102, when being charged to the discharge conversion, need stop charging operations,, carry out discharge operation again through behind the Dead Time in order to prevent when discharging and recharging conversion, might cause the short circuit of electric capacity; Accordingly, when discharging into the charging conversion, need stop discharge operation,, carry out charging operations again through behind the Dead Time.
In Dead Time, the electric current of generation can not interrupt, and then when said electric capacity being discharged and recharged conversion, also further comprises in the step 102:
In Dead Time, the energy that produces of storage or release current as required.
Shown in Fig. 5 A, it is in the bridge architecture sketch map one that the embodiment of the invention is regulated the supply voltage device, and the electric current of current source module (I1) is a constant current; Pulse current (Io) is a pulse width modulated wave; The normal voltage (Vins) of outside input is the RF envelope signal, and the modular converter of this device is made up of switch, wherein; This switch is made up of Q1, Q2, Q3 and four metal-oxide-semiconductors of Q4, and the module that is recharged of this device is a capacitor C 1.
Q1, Q2, Q3 and four switches of Q4 in the control circuit module difference control transformation module.
At first; Current source module produces a constant current (I1); Control circuit module is according to sending blanking time respectively to metal-oxide-semiconductor Q1, Q2, Q3 and four switch transmit buttons of Q4 signal, and then Q1, Q2, Q3 and four switches of Q4 are chopped into a pulse current (Io) with duty ratio with constant current.
Concrete operations are: when Q1 and Q3 unlatching, when Q2 and Q4 closed, pulse current charged to capacitor C 1; Otherwise when Q1 and Q3 close, when Q2 and Q4 opened, pulse current discharged to capacitor C 1, thereby produced output voltage (Vo), and exported to RF power amplification.
Further, control circuit module sampling and outputting voltage (Vo) compares according to the normal voltage (Vins) with the outside input; If the absolute value of output voltage and normal voltage difference is greater than threshold value; Then the control circuit module adjustment is to the blanking time that Q1, Q2, Q3 and four switches of Q4 send pwm switching signal, and the pulse current that Q1, Q2, four switches of Q3 and Q4 become current chopping according to pwm switching signal is owing to adjusted the blanking time of sending pwm switching signal; Also just changed the duty ratio of pulse current; Promptly changed the frequency and/or the width of pulse current, so just changed the discharging and recharging the time of capacitor C 1, thereby adjusted output voltage.
Be in course of adjustment, control circuit module is constantly regulated the blanking time of sending pwm switching signal, and continuous sampling and outputting voltage (Vo); Compare with the normal voltage (Vins) of outside input; When the absolute value of output voltage and normal voltage difference is not more than threshold value, stop to regulate the blanking time of sending pwm switching signal, maintenance should blanking time; And according to sending pwm switching signal this blanking time, the normal voltage (Vins) of input changes up to the outside.
Such as: current transmission blanking time is 3us and 2us, and just to carry out the charging interval be 3us to capacitor C 1, and be 2us discharge time; Then blanking time is sent in adjustment, when the absolute value of output voltage and normal voltage difference is not more than threshold value, stops adjustment and sends blanking time; Adjusted transmission blanking time is 2us and 3us; Then to carry out the charging interval be 2us to capacitor C 1, and be 3us discharge time, like this with regard to indirect adjustment output voltage.
Further, when the switching signal of Q1 and Q3 was identical, Q1 and Q3 opened simultaneously or close; When the switching signal of Q2 and Q4 was identical, Q2 and Q4 opened simultaneously or close, and sent Q1, Q3 and Q2, the anti-phase each other of Q4 two paths of signals, but because the problem of element; On certain time point, Q1, Q3 and Q2, Q4 might open simultaneously, and the resistance in the short circuit is reduced, and make electric current increase; Just will certainly cause the C1 short circuit,, a Dead Time can be set in order to prevent the generation of the problems referred to above; In the switching waveform sketch map shown in Fig. 5 B, suppose high level representative unlatching, the low level representative is closed; Then in Dead Time, the situation that switch is all opened so just can not take place in four not conductings of switching tube.
But current source module also can continue to produce electric current in Dead Time, and at this moment the release module among Fig. 5 A will discharge the energy that current source module produces.
Concrete condition is: constant-current source I1 is used for discharging the energy that the interior current source of Dead Time passes to C2 through the module B1 that the diode D1 in the release module, capacitor C 2 form current circuit and C2 parallel connection.Wherein, B1 can be a simple resistance, also can be an ability energy pass back to certain power supply or pass to load than complicated circuitry.
The power supply of exporting among Fig. 5 A can also become ET or EER power supply.
The capacity of supposing C1 is C, then to the electric capacity charging, and the voltage at electric capacity two ends, promptly Vo rises, and its rate of climb is dV/dt=(I1-Io)/C; Otherwise to capacitor discharge, the voltage at electric capacity two ends descends, and its decrease speed is dV/dt=(I1+Io)/C; Suppose in the pulse current cycle T that the charging interval is Ton, be that the Toff total electrical charge that electric capacity fills into when then one-period finishes does discharge time
ΔQ＝Ton*(I1-Io)/C-Toff(I1+Io)/C＝(Ton-Toff)*I1/C-(Ton+Toff)*Io/C
Because of duty ratio D=Ton/T, Toff=T-Ton in the formula above the substitution, obtains again
ΔQ＝[(2*D-1)*I1-Io]*T/C
Wherein (2*D-1) * I1*T/C represents the contribution in input current source, and-Io*T/C represents the contribution of load.
Suppose that electric capacity is 0 at the first threshold voltage in 0 moment, then the expression formula of t moment output voltage V o does
From above-mentioned expression formula, can find out: when D=0.5, Vo=0; When D＞0.5, Vo＞0; D＜0.5 o'clock, Vo＜0.Therefore, regulating the supply voltage device both can output dc voltage, also can output AC voltage.When regulating output voltage and make it follow a signal Vins and change, power supply just can become ET or EER power supply, from the radiofrequency signal sketch map of the adjusting supply voltage device of Fig. 5 C, can find out that output voltage is being followed a signal in continuous variation.
Shown in Fig. 5 D, it is in the bridge architecture sketch map two that the embodiment of the invention is regulated the supply voltage device, is that with the difference of Fig. 5 A current source module is a forward converter.
Wherein, the timing reference signal among the figure is that control Driver Circuit sends to control circuit module, and control circuit module transmission timing reference signal goes to control unlatching and the shutoff of Q5, Q6.Certainly, the type of drive of Q5, Q6 also can adopt from driving, and just on transformer T1, increases by two windings again and drives Q5, Q6.As required, Q5, Q6 can also replace with Schottky diode or other similar diode.
The concrete course of work is: during switching tube Q7 conducting, Vi is added on the elementary winding L 2, through electromagnetic induction, induces a voltage on the secondary winding; Conducting this moment Q5 turn-offs Q6, and induced voltage on the secondary winding L3 and output voltage V o series connection are added on the inductance L 1, and the last electric current of L1 begins to rise; The rate of climb is (Vi/N+k*Vo)/L1, (N is a transformer primary and secondary turn ratio, k=1 or-1, and induced voltage on the secondary winding L3 and output voltage V o are along when string k=1; When playing a reversed role, k=-1), current sampling signal also and then rises, when rising to setting; Control Driver Circuit is sent cut-off signals, turn-offs Q7, and control circuit module is sent signal and turn-offed Q5 conducting Q6; So the electric current on the inductance L 1 begins to descend, and after the decline process is kept a period of time, begins the process of repetition front again; So repeatedly, make the electric current on the inductance L 1 keep substantially constant, become constant-current source.The grid voltage waveform of switch Q7 and the current wave on the L1 be (high level is open-minded, and low level is turn-offed) shown in Fig. 5 E.
Can use a kind of in peak current control mode, Average Current Control mode or the current hysteresis ring control mode to the control mode of current source I1.
If adopt current hysteresis ring control mode, need to detect the peak value and the valley of electric current,, turn-offs at the peak of electric current Q7 when surpassing the maximum of setting,, opens the valley of electric current Q7 when being lower than the minimum value of setting.
The adjusting supply unit that the embodiment of the invention provides can also be applied in the audio frequency power amplifier.
Shown in Fig. 5 F, embodiment of the invention adjusting supply voltage device is that the structural representation three of H bridge switch circuit is the change of on the basis of Fig. 5 D, carrying out, and difference is that the normal voltage of outside input is an audio signal, then the voltage that generates is exported to loud speaker.
This moment, input signal Vins was exactly a source of sound.Because the embodiment of the invention is directly sampled to the voltage that forms, and just adopts complete negative feedback, has better fidelity than the non-complete negative feedback of prior art, littler harmonic distortion, thus can reach better effect.
Certainly, what current source module can also be with shown in Fig. 5 A is identical, then only needs the normal voltage of the input of the outside among Fig. 5 A is become audio signal, and RF power amplification becomes loud speaker and gets final product, and repeats no more here.
The adjusting supply voltage device that the embodiment of the invention provides can also adopt non-bridge architecture.The bridge architecture of this structure and front is compared, and Vo can not can only export positive voltage less than 0, and the capacitance discharges load that places one's entire reliance upon.
Shown in Fig. 6 A; It is in the non-bridge architecture sketch map one that the embodiment of the invention is regulated the supply voltage device; The electric current of current source module (I1) is a constant current, and pulse current (Io) is a pulse width modulated wave, and the normal voltage (Vins) of outside input is a radiofrequency signal; The modular converter of this device is made up of Q8 and two switches of Q9, and the module that is recharged of this device is a capacitor C 1.
At first, current source module produces a constant current (I1), and control circuit module is chopped into a pulse current (Io) with duty ratio according to sending blanking time respectively to Q8 and two switch transmit buttons of Q9 signal with constant current.
Concrete operations are: when the Q9 unlatching, when Q8 closed, pulse current charged to capacitor C 1; Otherwise when Q9 closes, when Q8 opened, pulse current discharged to capacitor C 1, thereby produced output voltage (Vo), and exported to RF power amplification.
Further, the control circuit module sampling and outputting voltage, the normal voltage of importing according to the outside (Vins) compares; If the absolute value of output voltage and normal voltage difference is greater than threshold value; Then adjust to the blanking time of Q8 and two switches transmissions of Q9 pwm switching signal, the pulse current that two switches of Q8 and Q9 become current chopping according to pwm switching signal is owing to adjusted the blanking time of sending pwm switching signal; Also just changed the duty ratio of pulse current; Promptly changed the frequency and/or the width of pulse current, so just changed the discharging and recharging the time of capacitor C 1, thereby adjusted output voltage.
In mediation process, control circuit module is constantly regulated the blanking time of sending pwm switching signal, and continuous sampling and outputting voltage (Vo); Compare with the normal voltage of outside input; When the absolute value of output voltage and normal voltage difference is not more than threshold value, stop to regulate the blanking time of sending pwm switching signal, maintenance should blanking time; And according to sending pwm switching signal this blanking time, the normal voltage (Vins) of input changes up to the outside.
Such as: current transmission blanking time is 3us and 2us, and just to carry out the charging interval be 3us to capacitor C 1, and be 2us discharge time; Then blanking time is sent in adjustment, when the absolute value of output voltage and normal voltage difference is not more than threshold value, stops adjustment and sends blanking time; Adjusted transmission blanking time is 2ms and 3ms; Then to carry out the charging interval be 2ms to capacitor C 1, and be 3ms discharge time, like this with regard to indirect adjustment output voltage.
Further, Q8 opens or closes according to switching signal; Q9 opens or closes according to switching signal, and the two paths of signals anti-phase each other of sending Q8 and Q9, but because the problem of element, on certain time point; Q8 and Q9 might open simultaneously, and the resistance in the short circuit is reduced, and make electric current increase; Just will certainly cause the C1 short circuit,, a Dead Time can be set in order to prevent the generation of the problems referred to above; In Dead Time, the situation that switch is all opened so just can not take place in two not conductings of switching tube.
Device shown in Fig. 6 A can also become power amplifier.
The capacity of supposing C1 is C, then to the electric capacity charging, and the voltage at electric capacity two ends, promptly Vo rises, and its rate of climb is dV/dt=(I1-Io)/C; Otherwise to capacitor discharge, the voltage at electric capacity two ends descends, and its decrease speed is dV/dt=Io/C; Suppose in the pulse current cycle T that the charging interval is Ton, be Toff discharge time, and the total electrical charge that electric capacity filled into when then one-period finished does
ΔQ＝Ton*(I1-Io)/C-Toff*Io/C＝Ton*I1/C-(Ton+Toff)*Io/C
Because of duty ratio D-=Ton/T, Toff=T-Ton in the formula above the substitution, obtains again
ΔQ＝[D*I1-Io]*T/C
Wherein D*I1*T/C represents the contribution in input current source, and-Io*T/C represents the contribution of load.
Suppose that electric capacity is 0 at the first threshold voltage in 0 moment, then the expression formula of t moment output voltage V o does
From above-mentioned expression formula, can find out: when D=0, Vo=0; When D＞0, Vo＞0.Therefore, this adjusting supply voltage device can output dc voltage.When the adjusting output voltage makes it follow a signal Vins variation, regulate the supply voltage device and just become a power amplifier.
Owing to when C1 is discharged, can only rely on the load in the RF power amplification, if load is very little; The meeting that the last voltage of C1 descends is very slow, thereby influences the speed of pressure regulation, if as power amplifier; Return and cause serious wave distortion, be used for discharge so can introduce a dummy load.
Shown in Fig. 6 B, this figure has increased a dummy load B1 on the basis of Fig. 6 A, be used for discharging the electric weight of C1, thereby has accelerated the speed of pressure regulation.
Wherein, B1 can be a resistance; Also can be one is used for other local complicated circuits are stored or transferred to energy.
Because direct output AC voltage among Fig. 6 A is if output AC voltage must add a capacitance and realize.
Shown in Fig. 6 C, this figure is that the normal voltage of on the basis of Fig. 6 B, the outside being imported becomes audio signal, and RF power amplification becomes loud speaker, the capacitance of on loud speaker, having connected, thus can output AC voltage.
Certainly, the current source module among Fig. 6 A, Fig. 6 B and Fig. 6 C can also can be other switch converters for forward converter, and method and Fig. 5 category-B seemingly repeat no more here.
From the foregoing description, can find out: a kind of adjusting supply voltage device that the embodiment of the invention provides, this device comprises: current source module, control circuit module, modular converter and be recharged module, wherein: said current source module is used to produce electric current; Said control circuit module is used for according to sending transmit button signal blanking time; Said modular converter is used for according to said switching signal said current chopping being become pulse current, and said pulse current discharges and recharges the said module that is recharged; The said module that is recharged is used for through said pulse current the said module that is recharged being discharged and recharged, and forms output voltage; Thereby accelerated the speed of adjustment voltage; Satisfy the occasion that requires at a high speed, and eliminated vibration, core loss and audible noise, improved whole efficiency and stability.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. regulate the supply voltage device for one kind, it is characterized in that said device comprises: current source module, control circuit module, modular converter and be recharged module, wherein:
Said current source module is used to produce electric current;
Said control circuit module is used for according to sending transmit button signal blanking time;
Said modular converter is used for according to said switching signal said current chopping being become pulse current;
The said module that is recharged is used for through said pulse current the said module that is recharged being discharged and recharged, and forms output voltage.
2. adjusting supply voltage device according to claim 1; It is characterized in that; Said control circuit module is sampled to the said output voltage that is recharged module, at the absolute value of said output voltage and normal voltage difference during greater than threshold value, adjusts said transmission blanking time.
3. device as claimed in claim 1 is characterized in that, said control circuit module is set Dead Time; Said modular converter is charged to when conversion discharge to the said module that is recharged; Stop charging operations,, carry out discharge operation through behind the said Dead Time; Or,
Said modular converter discharges into when conversion charging to the said module that is recharged, and stops discharge operation, through behind the said Dead Time, carries out charging operations.
4. device as claimed in claim 3 is characterized in that, the device of said adjusting supply voltage also comprises:
Protection module, be used for said modular converter to said be recharged module and carry out charge or discharge conversions after, in said Dead Time stored or discharge the energy that said current source module produces.
5. device as claimed in claim 1 is characterized in that, the electric current that said current source module produces can be constant current or time-varying current.
6. device as claimed in claim 2 is characterized in that, said normal voltage is voltage that is provided with in advance or the normal voltage of importing from the outside.
7. device as claimed in claim 6 is characterized in that, if the normal voltage of said outside input is a radiofrequency signal, the then said module that is recharged offers RF power amplification with said voltage;
If the normal voltage of said outside input is an audio signal, the then said module that is recharged offers loud speaker with said voltage.
8. device as claimed in claim 1 is characterized in that, said pulse current is a kind of in the impulse wave of pulse width modulated wave, pulse frequency modulation ripple or the ring modulation that stagnates.
9. device as claimed in claim 1 is characterized in that, said modular converter can adopt a kind of in isolated topology or the non-isolated topology.
10. a method of regulating supply voltage is characterized in that, this method comprises:
Produce electric current;
According to sending transmit button signal blanking time;
According to said switching signal, said current chopping is become pulse current, said pulse current discharges and recharges electric capacity, forms output voltage.
11. the method for adjusting supply voltage according to claim 10 is characterized in that, said method further comprises:
Said voltage is sampled, at the absolute value of said voltage and normal voltage difference during, adjust said transmission blanking time greater than threshold value.
12. method as claimed in claim 10 is characterized in that, said method further comprises:
Set Dead Time, then when said electric capacity being charged to the discharge conversion, stop charging operations,, carry out discharge operation through behind the said Dead Time; Or,
When said electric capacity being discharged into the charging conversion, stop discharge operation, through behind the said Dead Time, carry out charging operations.
13. method as claimed in claim 12 is characterized in that, saidly the time also comprises said electric capacity being discharged and recharged conversion:
In said Dead Time stored or discharge the energy that said electric current produces.
14. method as claimed in claim 10 is characterized in that, said electric current can be constant current or time-varying current.
15. method as claimed in claim 11 is characterized in that, said normal voltage is voltage that is provided with in advance or the normal voltage of importing from the outside.
16. method as claimed in claim 15 is characterized in that, if the normal voltage of said outside input is a radiofrequency signal, then said voltage is exported to RF power amplification;
If the normal voltage of said outside input is an audio signal, then said voltage is exported to loud speaker.
17. method as claimed in claim 10 is characterized in that, said pulse current is a kind of in the impulse wave of pulse width modulated wave, pulse frequency modulation ripple or the ring modulation that stagnates.
18. method as claimed in claim 10 is characterized in that, it is through adopting a kind of realization the in isolated topology or the non-isolated topology that said pulse current discharges and recharges electric capacity.
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| CN2007101453808A CN101388603B (en) | 2007-09-11 | 2007-09-11 | Method and apparatus for regulating power source voltage |
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| CN2007101453808A CN101388603B (en) | 2007-09-11 | 2007-09-11 | Method and apparatus for regulating power source voltage |
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| CN101388603A CN101388603A (en) | 2009-03-18 |
| CN101388603B true CN101388603B (en) | 2012-01-11 |
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| CN102751853B (en) * | 2012-07-31 | 2017-09-05 | 湖北工业大学 | A kind of novel digital power recommends pwm signal generation circuit |
| CN104038029B (en) * | 2014-06-24 | 2016-09-14 | 矽力杰半导体技术(杭州)有限公司 | Duty cycle conversion circuit and conversion method |
| CN106291010A (en) * | 2016-08-11 | 2017-01-04 | 河北白晶环境科技有限公司 | Multipath controllable constant current source in high precision |
| CN107896060A (en) * | 2017-11-06 | 2018-04-10 | 上海斐讯数据通信技术有限公司 | Feedback regulation inductance solves circuit structure and its method that inductance is uttered long and high-pitched sounds |
| CN107947571A (en) * | 2017-11-14 | 2018-04-20 | 上海斐讯数据通信技术有限公司 | A kind of DC DC Switching Power Supplies and its inductance are uttered long and high-pitched sounds removing method |
| CN112859983B (en) * | 2021-01-06 | 2022-04-12 | 深圳市紫光同创电子有限公司 | Power supply regulating circuit and method of chip |
| CN113890336B (en) * | 2021-12-07 | 2022-04-15 | 深圳易能时代科技有限公司 | Voltage regulation control circuit, system and method |
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