CN105162325A - Pulse frequency modulation circuit based on reference voltage comparison oscillator - Google Patents
Pulse frequency modulation circuit based on reference voltage comparison oscillator Download PDFInfo
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Abstract
A pulse frequency modulation circuit based on a reference voltage comparison oscillator relates to a switch power supply circuit. The circuit comprises a work circuit, a control circuit, a clock signal generator, a first comparator and an adjusting unit. The work circuit is switched between a charge mode and a discharge mode under the effect of pulse modulation signals. The control circuit generates pulse modulation signals according to a first reference voltage, voltage feedback signals and frequency variable clock signals. The control circuit includes an error amplifier for providing error amplification signals. The first comparator compares voltages on the two ends of a second energy storage element with a second reference voltage, and generates transformed high and low levels which serve as clock signals. The adjusting unit receives control of the error amplification signals, and selects one of voltage reference signals different in voltage as a second reference voltage. The output of the error amplification signals directly controls the frequency of the clock signals, so periods are steadily and ripples of output voltages are minimized.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of switching power circuit.
Background technology
Pulse-width-modulated mode (PulseWidthModulation, and pulse frequency modulated pattern (PulseFrequencyModulation PWM), PFM) be two large class dc-dc frameworks, in the efficiency of every type when heavy duty and underload, load regulation, design complexity etc., performance characteristic is different, because load level, in whole circuit working process, significant change may occur, being 1 ~ 2mA when sleeping, then can reaching hundreds of mA at normal operation period.In prior art, when underload, PWM converter can automatically switch to a kind of low-power consumption mode to reduce battery current consumption to greatest extent, by intermittently sending pulse signal, pass through to reduce on-off times under realizing constant frequency, increase duty ratio and improve underloading and standby efficiency, the oscillogram of the pulse-modulated signal PFM1 of this pattern as shown in Figure 1, but this method can cause output ripple higher, control method is unsatisfactory.
Summary of the invention
The object of the invention is to, a kind of pulse frequency modulation circuit based on reference voltage comparison oscillator is provided, solves above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
Based on the pulse frequency modulation circuit of reference voltage comparison oscillator, wherein, comprising:
One first switching device group, alternate conduction or shutoff under a pulse-modulated signal effect;
One operating circuit being provided with the first energy-storage travelling wave tube, switches under the effect of described first switching device group between charge mode and discharge mode;
One control circuit, in order to according to one first reference voltage, a voltage feedback signal, a current detection signal and a clock signal production burst modulation signal;
Described control circuit comprises,
One error amplifier, for comparing described first reference voltage and described voltage feedback signal, obtains an error amplification signal;
One clock signal generator; Produce described clock signal, and clock signal described in the compensation adjustment accepting described error amplification signal; Described clock signal generator comprises,
The one oscillator charging and discharging circuit being provided with the second energy-storage travelling wave tube, switchably switches under the effect of a control signal between oscillator charge mode and oscillator discharge pattern;
One first comparator, for comparing the voltage at described second energy-storage travelling wave tube two ends and described second reference voltage, produces the high level signal of conversion and low level signal as described clock signal;
One regulon, the control accepting described error amplification signal from multiple have the reference voltage signal of different voltage swing select a reference voltage signal to be connected to described first comparator, as described second reference voltage.
Preferably, described regulon comprises,
One analog to digital converter, for carrying out analog-to-digital conversion to described error amplification signal, obtains digital signal;
The adjustment branch road of a plurality of parallel connection, each regulates a reference voltage signal that branch road connects, reference voltage signal described in each is connected a switch, the control end of described switch connects the output of described analog to digital converter respectively, select wherein to regulate branch road conducting described in a road under the effect of described digital signal, to select a described reference voltage signal.
Preferably, described oscillator charging and discharging circuit comprises,
One first switching branches, is switchably serially connected with one first current source and one second and crosses between node under described control signal effect;
One second switch branch road, is switchably serially connected with between one second current source and an earth terminal under described control signal effect;
One oscillator discharge and recharge branch road, is parallel to the two ends of described second switch branch road, and described second energy-storage travelling wave tube is series on described oscillator discharge and recharge branch road.
Preferably, multiple described reference voltage signal is produced by same reference voltage circuit.
Preferably, described first switching branches is connected described clock signal with the control end of described second switch branch road, using described clock signal as described control signal.
Preferably, the control end of described first switching branches or described second switch branch road is connected a logic gates with between described clock signal, to provide the control signal of complementation to described first switching branches and described second switch branch road.
Preferably, described control circuit also comprises,
One second comparator, for comparing described error amplification signal and described current detection signal, produces a comparison signal;
One PWM controller, produces described pulse-modulated signal according to described comparison signal and described clock signal.
Preferably, described operating circuit comprises:
One charging controlling brancher, is connected to an Input voltage terminal and one first and crosses between node;
One discharge and recharge branch road, is connected to described first and crosses between node and an output voltage terminal;
One control of discharge branch road, is connected to described first and crosses between node and an earth terminal, and described first energy-storage travelling wave tube is series on described discharge and recharge branch road;
Described operating circuit is when charge mode, and described first switching device group controls described charging controlling brancher and the conducting of described discharge and recharge branch road, and controls the disconnection of described control of discharge branch road, and the electric current that described input is inputted is to described first energy-storage travelling wave tube charging;
Described operating circuit is when discharge mode, and described first switching device group controls described control of discharge branch road and the conducting of described discharge and recharge branch road, and controls the disconnection of described charging controlling brancher, and described first energy-storage travelling wave tube is discharged to described output.
Preferably, described control circuit also comprises,
One feedback network, is connected between described output voltage terminal and described earth terminal, in order to produce described voltage feedback signal;
One current detection circuit, the controllable described Input voltage terminal and described first that is parallel to crosses between node, in order to produce described current detection signal according to described pulse-modulated signal.
Preferably, described current detection circuit comprises,
One detects resistance, is series on current detection circuit;
One detects compensating unit, connects the two ends of described detection resistance, in order to detect the electric current flowing through and detect resistance;
One controls the detection control switch of break-make by pulse-modulated signal, is connected on described current detection circuit.
Beneficial effect: owing to adopting above technical scheme, circuit structure of the present invention, has been newly increased clock signal adjustment path, has directly been controlled the frequency of clock signal, make cycle stability, reduce the ripple of output voltage by the output of error amplification signal.
Accompanying drawing explanation
Fig. 1 is the oscillogram of the pulse-modulated signal PFM1 of prior art;
Fig. 2 is electrical block diagram of the present invention;
Fig. 3 is the circuit diagram of clock signal generator of the present invention;
Fig. 4 is the oscillogram of pulse-modulated signal PFM2 of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 2, Fig. 3, based on the pulse frequency modulation circuit of reference voltage comparison oscillator, wherein, comprising:
One first switching device group, alternate conduction or shutoff under a pulse-modulated signal effect;
One operating circuit being provided with the first energy-storage travelling wave tube, switches under the effect of the first switching device group between charge mode and discharge mode;
One control circuit, in order to the clock signal production burst modulation signal according to one first reference voltage Vref 1, voltage feedback signal Vfb, a current detection signal and a changeable frequency;
Control circuit comprises
One error amplifier 1, for comparing the first reference voltage Vref 1 and voltage feedback signal Vfb, obtains an error amplification signal EAout;
One clock signal generator 2, clocking, and the compensation adjustment clock signal accepting error amplification signal EAout; Clock signal generator 2 comprises,
The one oscillator charging and discharging circuit being provided with the second energy-storage travelling wave tube, switchably switches under the effect of a control signal between oscillator charge mode and oscillator discharge pattern;
One first comparator 22, for comparing the voltage at the second energy-storage travelling wave tube C two ends and one second reference voltage Vref 2, the high level signal and the low level signal that produce conversion make clock signal;
One regulon, the control accepting error amplification signal EAout from multiple have the reference voltage signal of different voltage swing select a reference voltage signal to be connected to the first comparator 22, as the second reference voltage Vref 2.
As a kind of preferred embodiment of the present invention, regulon comprises,
One analog to digital converter 21, for carrying out analog-to-digital conversion to error amplification signal EAout, obtains digital signal;
The adjustment branch road of a plurality of parallel connection, each regulates a reference voltage signal that branch road connects, each reference voltage signal is connected a switch, the output of the control end difference connection mode number converter of switch, under the effect of digital signal, select a wherein road to regulate branch road conducting, to select a reference voltage signal.
As a kind of preferred embodiment of the present invention, oscillator charging and discharging circuit comprises,
One first switching branches, is switchably serially connected with one first current source 23 and one second and crosses between node under control signal effect;
One second switch branch road, is switchably serially connected with between one second current source 24 and an earth terminal GND under control signal effect;
One oscillator discharge and recharge branch road, is parallel to the two ends of second switch branch road, and the second energy-storage travelling wave tube is series on oscillator discharge and recharge branch road.
Oscillator charging and discharging circuit when charge mode, the first switching branches, the conducting of oscillator discharge and recharge branch road, second switch branch road turns off, and the electric current that current source on conducting branches produces charges to the second energy-storage travelling wave tube;
Oscillator charging and discharging circuit when discharge mode, second switch branch road, the conducting of oscillator discharge and recharge branch road, the first switching branches, oscillator regulate branch road turn off, the second energy-storage travelling wave tube discharges to second switch branch road;
Under constant current source charging, the voltage at the second energy-storage travelling wave tube two ends linearly increases in time, the ratio of charging current and capacitance reflects the speed that charging current is charged to capacitor, under the effect of digital signal, selection one tunnel regulates branch road conducting, to change the second reference voltage, realize the adjustment of charging speed, the second current source 24 on second switch branch road is by changing discharging current size, realize the adjustment of electric discharge speed, the final frequency realizing adjustment clock signal, obtain the pulse-modulated signal needed, the oscillogram of pulse-modulated signal PFM2 is as shown in Figure 4 compared the pulse adjustment signal period shown in Fig. 1 and is stablized, realize the object of the ripple reducing output voltage.
As a kind of preferred embodiment of the present invention, multiple reference voltage signal is produced by same reference voltage circuit.
As a kind of preferred embodiment of the present invention, the first switching branches is connected clock signal with the control end of second switch branch road, using clock signal as control signal.
As a kind of preferred embodiment of the present invention, the control end of the first switching branches or second switch branch road be connected a logic gates between clock signal, to provide complementary control signal to the first switching branches and second switch branch road.
A kind of specific embodiment, first switching branches series switching devices S1, second switch branch road series switching devices S2, switching device S1 can be P channel MOS tube, switching device S2 can be N-channel MOS pipe, using clock signal as control signal, clock signal connects the control end of the first switching branches and second switch branch road.Switching device S1 and switching device S2 can be all P channel MOS tube, now, the control end of the first switching branches or second switch branch road be connected a logic gates between clock signal, to provide complementary control signal to the first switching branches and second switch branch road.Control switch device S1 and switching device S2 replaces break-make, realizes oscillator charging and discharging circuit and alternately switches between charge mode and discharge mode.
As shown in Figure 3 a plurality of adjustment branch road can comprise that reference voltage signal Vref11 connects with switching device S3 first regulate branch road, reference voltage signal Vref12 to connect with switching device S4 second regulate branch road, reference voltage signal Vref13 to connect with switching device S5 the 3rd regulate branch road, under the control of digital signal, realize one of them regulate branch road conducting, to select the reference voltage signal of different size.
Second energy-storage travelling wave tube of the present invention adopts capacity cell C.
Switching device S3 of the present invention, switching device S4 and switching device S5 can adopt N-channel MOS FET and/or P channel mosfet to realize.
As a kind of preferred embodiment of the present invention, control circuit also comprises,
One second comparator 3, for comparing error amplification signal EAout and current detection signal, produces a comparison signal;
One PWM controller 5, PWM controller 5 connects clock signal, produces pulse-modulated signal according to comparison signal and clock signal.
As a kind of preferred embodiment of the present invention, operating circuit comprises:
One charging controlling brancher, is connected to an Input voltage terminal VDD and 1 first and crosses between node Lx;
One discharge and recharge branch road, is connected to first and crosses between node Lx and an output voltage terminal Vout;
One control of discharge branch road, be connected to first and cross between node Lx and an earth terminal GND, the first energy-storage travelling wave tube is series on discharge and recharge branch road;
Operating circuit is when charge mode, and the first switching device group controls charging controlling brancher and the conducting of discharge and recharge branch road, and controlled discharge controlling brancher disconnects, and the electric current that input is inputted charges to the first energy-storage travelling wave tube;
Operating circuit is when discharge mode, and the first switching device group controlled discharge controlling brancher and the conducting of discharge and recharge branch road, and the disconnection of control charging controlling brancher, make the first energy-storage travelling wave tube discharge to output.
As a kind of preferred embodiment of the present invention, control circuit also comprises,
One feedback network, is connected between output voltage terminal Vout and earth terminal GND, in order to produce voltage feedback signal;
One current detection circuit, the controllable Input voltage terminal VDD and first that is parallel to crosses between node Lx, in order to according to pulse-modulated signal generation current detection signal.
As a kind of preferred embodiment of the present invention, feedback network is formed primarily of a resistor voltage divider circuit, resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between output voltage terminal Vout and earth terminal GND, and the point be connected between divider resistance forms divider node;
Feedback voltage signal is drawn from predetermined divider node place.
A kind of specific embodiment, feedback network comprises the first resistance R1 and the second resistance R2 of series connection mutually, and the Nodes that feedback voltage signal is connected with the second resistance R2 from the first resistance R1 is drawn.
As a kind of preferred embodiment of the present invention, current detection circuit comprises:
One detects resistance Rb, is series on current detection circuit;
One detects compensating unit 4, connects the two ends detecting resistance Rb, in order to detect the electric current flowing through and detect resistance;
One controls the detection control switch Mp2 of break-make by pulse-modulated signal, is connected on current detection circuit.
Detect compensating unit 4 to be also connected with clock signal, for compensating detection electric current, object is stabling current detection loop.
As a kind of preferred embodiment of the present invention, the first energy-storage travelling wave tube of the present invention adopts inductance component L, is also connected a filter capacitor C1 between output end vo ut with earth terminal GND.
As a kind of preferred embodiment of the present invention, control circuit also comprises a zero cross detection circuit 6, and the output of zero cross detection circuit 6 is connected with PWM controller 5.In switching power circuit, when load is larger, inductive current can not get back to zero within the whole cycle, circuit is made usually to be in continuous conduction mode, but when load current continuous decrease and low to a certain critical value time, first switching tube Mp and second switch pipe Mn may close in one-period simultaneously, now the mode of operation of inductive current is called DCM, electric current during this period on inductance is zero, time under discontinuous inductive current pattern, due to the logical delay of converter inside, the impact of the factors such as wire delay and parasitism, when causing load current to continue to drop to critical value, second switch pipe Mn does not turn off or does not turn off completely, electric current now can be caused to pour in down a chimney, output voltage is made to send fluctuation greatly, the performance index of influential system, pour in down a chimney for preventing electric current by arranging zero cross detection circuit 6, avoid the problems referred to above, the zero cross detection circuit of prior art can be adopted realize, therefore not to repeat here.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (10)
1. based on the pulse frequency modulation circuit of reference voltage comparison oscillator, it is characterized in that, comprising:
One first switching device group, alternate conduction or shutoff under a pulse-modulated signal effect;
One operating circuit being provided with the first energy-storage travelling wave tube, switches under the effect of described first switching device group between charge mode and discharge mode;
One control circuit, in order to the clock signal production burst modulation signal according to one first reference voltage, a voltage feedback signal, a current detection signal and a changeable frequency;
Described control circuit comprises,
One error amplifier, for comparing described first reference voltage and described voltage feedback signal, obtains an error amplification signal;
One clock signal generator, produces described clock signal, and clock signal described in the compensation adjustment accepting described error amplification signal; Described clock signal generator comprises,
The one oscillator charging and discharging circuit being provided with the second energy-storage travelling wave tube, switchably switches under the effect of a control signal between oscillator charge mode and oscillator discharge pattern;
One first comparator, for comparing the voltage at described second energy-storage travelling wave tube two ends and one second reference voltage, produces the high level signal of conversion and low level signal as described clock signal;
One regulon, the control accepting described error amplification signal from multiple have the reference voltage signal of different voltage swing select a reference voltage signal to be connected to described first comparator, as described second reference voltage.
2. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 1, is characterized in that, described regulon comprises,
One analog to digital converter, for carrying out analog-to-digital conversion to described error amplification signal, obtains digital signal;
The adjustment branch road of a plurality of parallel connection, each regulates a reference voltage signal that branch road connects, reference voltage signal described in each is connected a switch, the control end of described switch connects the output of described analog to digital converter respectively, select wherein to regulate branch road conducting described in a road under the effect of described digital signal, to select a described reference voltage signal.
3. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 1, is characterized in that, described oscillator charging and discharging circuit comprises,
One first switching branches, is switchably serially connected with one first current source and one second and crosses between node under described control signal effect;
One second switch branch road, is switchably serially connected with between one second current source and an earth terminal under described control signal effect;
One oscillator discharge and recharge branch road, is parallel to the two ends of described second switch branch road, and described second energy-storage travelling wave tube is series on described oscillator discharge and recharge branch road.
4. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 2, is characterized in that, multiple described reference voltage signal is produced by same reference voltage circuit.
5. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 3, it is characterized in that, described first switching branches is connected described clock signal with the control end of described second switch branch road, using described clock signal as described control signal.
6. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 5, it is characterized in that, the control end of described first switching branches or described second switch branch road is connected a logic gates with between described clock signal, to provide the control signal of complementation to described first switching branches and described second switch branch road.
7. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 1, is characterized in that, described control circuit also comprises,
One second comparator, for comparing described error amplification signal and described current detection signal, produces a comparison signal;
One PWM controller, produces described pulse-modulated signal according to described comparison signal and described clock signal.
8. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 1, is characterized in that, described operating circuit comprises:
One charging controlling brancher, is connected to an Input voltage terminal and one first and crosses between node;
One discharge and recharge branch road, is connected to described first and crosses between node and an output voltage terminal;
One control of discharge branch road, is connected to described first and crosses between node and an earth terminal, and described first energy-storage travelling wave tube is series on described discharge and recharge branch road;
Described operating circuit is when charge mode, and described first switching device group controls described charging controlling brancher and the conducting of described discharge and recharge branch road, and controls the disconnection of described control of discharge branch road, and the electric current that described input is inputted is to described first energy-storage travelling wave tube charging;
Described operating circuit is when discharge mode, and described first switching device group controls described control of discharge branch road and the conducting of described discharge and recharge branch road, and controls the disconnection of described charging controlling brancher, and described first energy-storage travelling wave tube is discharged to described output.
9. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 1, is characterized in that, described control circuit also comprises,
One feedback network, is connected between described output voltage terminal and described earth terminal, in order to produce described voltage feedback signal;
One current detection circuit, the controllable described Input voltage terminal and described first that is parallel to crosses between node, in order to produce described current detection signal according to described pulse-modulated signal.
10. the pulse frequency modulation circuit based on reference voltage comparison oscillator according to claim 9, is characterized in that, described current detection circuit comprises,
One detects resistance, is series on current detection circuit;
One detects compensating unit, connects the two ends of described detection resistance, in order to detect the electric current flowing through and detect resistance;
One controls the detection control switch of break-make by pulse-modulated signal, is connected on described current detection circuit.
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| CN112260683A (en) * | 2020-12-21 | 2021-01-22 | 深圳市芯天下技术有限公司 | Circuit and chip for multiplexing oscillator frequency adjustment module and reference module |
| CN112260683B (en) * | 2020-12-21 | 2021-03-30 | 芯天下技术股份有限公司 | Circuit and chip for multiplexing oscillator frequency adjustment module and reference module |
| CN116647098A (en) * | 2023-07-25 | 2023-08-25 | 江苏应能微电子股份有限公司 | Switching power supply on time control circuit and method and switching power supply |
| CN116647098B (en) * | 2023-07-25 | 2023-10-03 | 江苏应能微电子股份有限公司 | Switching power supply on time control circuit and method and switching power supply |
| CN118611428A (en) * | 2024-08-08 | 2024-09-06 | 深圳市微源半导体股份有限公司 | Frequency regulation circuit, voltage converter and switching power supply |
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