CN105811756A - Hybrid control type buck power converter - Google Patents
Hybrid control type buck power converter Download PDFInfo
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- CN105811756A CN105811756A CN201410844542.7A CN201410844542A CN105811756A CN 105811756 A CN105811756 A CN 105811756A CN 201410844542 A CN201410844542 A CN 201410844542A CN 105811756 A CN105811756 A CN 105811756A
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Abstract
The invention provides a hybrid control type buck power converter and particularly relates to a power converter. The power converter comprises a working circuit with an energy storage element, a switching device assembly and a control unit. The working circuit is alternately switched between the charging mode and the discharging mode under the effect of a PWM modulation signal or a PFM modulation signal. The control unit is used for generating a pulse modulation signal based on a reference voltage, a voltage feedback signal and a current detection signal. The current detection signal is generated by a current sampling circuit. The current sampling circuit changes the sampling ratio of the current under the effect of the PWM modulation signal or the PFM modulation signal. According to the technical scheme of the invention, even when the sampling ratio of the current is reduced in the PFM mode to cause the suddenly increasing condition of the load, the current is still kept low in the state of the sampling ratio. Therefore, the output current is increased. After the short-time recovery, the sampling ratio of the current sampling circuit is returned to a normal value. Therefore, the transient response of the circuit is improved, and the stability of the system is ensured.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of power supply changeover device.
Background technology
Along with the fast development of microelectric technique, voltage-dropping type (BUCK) power supply changeover device is owing to circuit structure is simple, easy to adjust, high reliability, in buck occasion extensive application；nullDifferent according to control mechanism，Buck DC-DC converter is divided into PWM (PulseWidthModulation) control mode、PFM (PulseFrequencyModulation) control mode and mixed-control mode three kinds，Mixed-control mode is in heavy duty situation，Adopt PWM working method，Under light load conditions，Switch to PFM working method，To utilize PWM working method and the respective advantage of PFM working method，Improve the conversion efficiency of transducer，It is applied in the control circuit of Switching Power Supply more and more，But，Buck DC-DC converter as described in Figure 1 is in application process，Increasing suddenly of controlled load makes output voltage fluctuation bigger，The voltage-vs-time of prior art or the oscillogram of current-vs-time show that when load increases suddenly under existing control mode, circuit transient response is poor as shown in Figure 2，It is unfavorable for stablizing of system.
Summary of the invention
It is an object of the invention to, it is provided that the BUCK type power supply changeover device of a kind of mixture control, solve above technical problem；
Technical problem solved by the invention can realize by the following technical solutions:
A kind of BUCK type power supply changeover device of mixture control, wherein, including,
One operating circuit being provided with energy-storage travelling wave tube；
One switching device group, modulates in a PWM modulation signal or a PFM and controls the alternately switching between charge mode and discharge mode of described operating circuit under signal function；
One control unit, in order to modulate signal from voltage feedback signal and a sampling of output voltage terminal from the current detection signal described PWM modulation signal of generation or the described PFM of described operating circuit according to a reference voltage, a sampling；
Described current detection signal is produced by a current sampling circuit, and described current sampling circuit is in the lower oversampling ratio changing electric current of effect of a PWM/PFM switching signal.
The BUCK type power supply changeover device of the mixture control of the present invention, described current sampling circuit includes,
One current detecting anode and a current detecting negative terminal；
One differential amplification unit, it is provided with first input end and the second input, the first input resistance branch road it is connected between described first input end with described current detecting anode, described second input is connected the second input resistance branch road with described current detecting negative terminal, described first input resistance branch road connects one first switch, described second input resistance branch road connects a second switch, described first switch and described second switch under the effect of described PWM/PFM switching signal on or off to change input resistance size；
One arithmetic element, is connected with the outfan of described differential amplification unit, for the output signal of described differential amplification unit is processed, to export described current detection signal.
The BUCK type power supply changeover device of the mixture control of the present invention, described first input resistance branch road includes predetermined number and is connected in series with each other the resistance between described first input end and described current detecting anode, described first switch in parallel in the two ends of resistance at least one described under the effect of described PWM/PFM switching signal on or off.
The BUCK type power supply changeover device of the mixture control of the present invention, described second input resistance branch road includes predetermined number and is connected in series with each other the resistance between described second input and described current detecting negative terminal, and described second switch is parallel to the two ends of at least one described resistance on or off under the effect of described PWM/PFM switching signal.
The BUCK type power supply changeover device of the mixture control of the present invention, described first switch and described second switch all adopt transmission gate, and the control end of described transmission gate is connected with described PWM/PFM switching signal.
The BUCK type power supply changeover device of the mixture control of the present invention, described differential amplification unit includes,
First metal-oxide-semiconductor, the grid of described first metal-oxide-semiconductor is connected with drain electrode, and source electrode connects described first input end；
Second metal-oxide-semiconductor, the source ground of described second metal-oxide-semiconductor, drain electrode is connected with the drain electrode of described first metal-oxide-semiconductor；Grid connects an offset signal；
3rd metal-oxide-semiconductor, the grid of described 3rd metal-oxide-semiconductor is connected with the grid of described first metal-oxide-semiconductor, and source electrode connects described second input；
4th metal-oxide-semiconductor, the source electrode of described 4th metal-oxide-semiconductor is connected with the source electrode of described second metal-oxide-semiconductor, and grid is connected with the grid of described second metal-oxide-semiconductor, and drain electrode is connected with the drain electrode of described 3rd metal-oxide-semiconductor.
The BUCK type power supply changeover device of the mixture control of the present invention, also includes a current detecting branch road, and described current detecting branch road includes,
One detection resistance, described current sampling circuit is parallel to described detection resistance two ends, in order to detect the electric current flowing through described detection resistance；
One is modulated signal by described PWM modulation signal or described PFM controls the detection control switch of break-make.
The BUCK type power supply changeover device of the mixture control of the present invention, described control unit includes,
One error amplifier, for described reference voltage and described voltage feedback signal are compared, obtains an error amplification signal；
One comparator, for described error amplification signal and described current detection signal are compared, produces a comparison signal；
One clock unit, is used for producing clock signal；
One PWM/PFM manipulator, described PWM/PFM manipulator connects described clock signal, for producing described PWM modulation signal or described PFM modulation signal according to described comparison signal and described clock signal.
The BUCK type power supply changeover device of the mixture control of the present invention, described PWM/PFM switching signal is produced by a logic control element, the input of described logic control element connects described error amplification signal, in order to described error amplification signal and one second reference voltage are compared, in order in the described PWM/PFM switching signal of the lower generation that imposes a condition.
Beneficial effect: owing to adopting above technical scheme, time BUCK circuit of the present invention enters PFM pattern, reduce the oversampling ratio of electric current, making to run into the situation that load increases suddenly, electric current is still in little oversampling ratio state, so that output electric current increases, after the short time recovers, the oversampling ratio of current sampling circuit returns to normal value, it is possible to improve the transient response of circuit, to guarantee system stability.
Accompanying drawing explanation
Fig. 1 is the cut-away view of the BUCK type power supply changeover device of prior art；
Fig. 2 is the current detection circuit figure of prior art；
Fig. 3 is the oscillogram of the output end voltage Vout and load current Iload of prior art；
Fig. 4 is the electrical block diagram of the present invention；
Fig. 5 is the current sampling circuit schematic diagram of the present invention；
Fig. 6 is the oscillogram of the output end voltage Vout and load current Iload of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than 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 premise not making creative work, broadly fall into 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 be mutually combined.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
Reference Fig. 4, Fig. 5, Fig. 6, the BUCK type power supply changeover device of a kind of mixture control, wherein,
Including,
One operating circuit being provided with energy-storage travelling wave tube；
One switching device group, modulates in a PWM modulation signal or a PFM and controls operating circuit alternately switching between charge mode and discharge mode under signal function；
One control unit, in order to modulate signal according to a reference voltage V ref, a voltage feedback signal Vfb and sampling sampled from output voltage terminal from current detection signal generation PWM modulation signal or the PFM of described operating circuit；
Current detection signal is produced by a current sampling circuit 3, and current sampling circuit 3 is in the lower oversampling ratio changing electric current of effect of a PWM/PFM switching signal.
The BUCK type power supply changeover device of the mixture control of the present invention, current sampling circuit includes,
An one current detecting anode CSP and current detecting negative terminal CSN；
One differential amplification unit 31, it is provided with first input end and the second input, the first input resistance branch road it is connected between first input end with current detecting anode CSP, second input is connected the second input resistance branch road with current detecting negative terminal CSN, first input resistance branch road connects one first switch 15, second input resistance branch road connects a second switch 16, first switch 15 and second switch 16 under the effect of PWM/PFM switching signal on or off to change input resistance size；
One arithmetic element 32, is connected with the outfan of differential amplification unit 31, for the output signal of differential amplification unit 31 is processed, with output electric current measure signal.
The BUCK type power supply changeover device of the mixture control of the present invention, first input resistance branch road includes predetermined number and is connected in series with each other the resistance between first input end and current detecting anode, the first switch in parallel in the two ends of at least one resistance under the effect of PWM/PFM switching signal on or off.
The BUCK type power supply changeover device of the mixture control of the present invention, second input resistance branch road includes predetermined number and is connected in series with each other the resistance between the second input and current detecting negative terminal, and second switch is parallel to the two ends of at least one resistance on or off under the effect of PWM/PFM switching signal.
A kind of specific embodiment, first input resistance branch road is connected the first resistance R11 and the three resistance R13, the two ends of the 3rd resistance R13 the first switch 15 in parallel, second input resistance branch road is connected the second resistance R12 and the four resistance R14, the two ends parallel connection second switch 16 of the 4th resistance R14, first switch 15 and second switch 16 can all adopt transmission gate, and the control end of transmission gate is connected with PWM/PFM switching signal.
When BUCK circuit enters PFM pattern time, PWM/PFM switching signal controls the first switch 15 and turns on second switch 16,3rd resistance R13 and the four resistance R14 is shorted respectively, the gain of circuit reduces, so that the oversampling ratio of current sampling circuit reduces, make to run into load when increasing suddenly, current sample is still in little oversampling ratio state, so that output electric current increases, after the short time recovers, BUCK circuit recovers to PWM mode, and the oversampling ratio of current sampling circuit returns to normal value.
The BUCK type power supply changeover device of the mixture control of the present invention, differential amplification unit includes,
First metal-oxide-semiconductor M1, the grid of the first metal-oxide-semiconductor M1 is connected with drain electrode, and source electrode connects first input end；
Second metal-oxide-semiconductor M2, the source ground of the second metal-oxide-semiconductor M2, drain electrode is connected with the drain electrode of the first metal-oxide-semiconductor M1；Grid connects an offset signal；
The grid of the 3rd metal-oxide-semiconductor M3, the 3rd metal-oxide-semiconductor M3 and the grid of the first metal-oxide-semiconductor M1 connect, and source electrode connects the second input；
The source electrode of the 4th metal-oxide-semiconductor M4, the 4th metal-oxide-semiconductor M4 and the source electrode of the second metal-oxide-semiconductor M2 connect, and the grid of grid and the second metal-oxide-semiconductor M2 connects, and drain electrode is connected with the drain electrode of the 3rd metal-oxide-semiconductor M3.
The BUCK type power supply changeover device of the mixture control of the present invention, also includes a current detecting branch road, and current detecting branch road includes,
One detection resistance Rb, current sampling circuit 3 is parallel to detection resistance Rb two ends, in order to detect the electric current flowing through detection resistance Rb；
One is modulated signal by PWM modulation signal or PFM controls the detection control switch Msen of break-make.
The BUCK type power supply changeover device of the mixture control of the present invention, operating circuit includes,
Charging controlling brancher, is connected to input VDD and crosses between node Lx；
Discharge and recharge branch road, is connected to and crosses between node Lx and output voltage terminal Vout；
Control of discharge branch road, is connected to and crosses between node Lx and earth terminal GND；
Energy-storage travelling wave tube L is series on discharge and recharge branch road；
Operating circuit is when charge mode, and switching device group controls charging controlling brancher and the conducting of discharge and recharge branch road, and controls the disconnection of control of discharge branch road, makes the electric current that input inputs that energy-storage travelling wave tube L to be charged；
Operating circuit is when discharge mode, and switching device group controls control of discharge branch road and the conducting of discharge and recharge branch road, and controls charging controlling brancher disconnection, makes energy-storage travelling wave tube to output voltage terminal Vout.
A kind of specific embodiment, connect on charging controlling brancher a P-channel metal-oxide-semiconductor Mp, connect on control of discharge branch road a N-channel MOS pipe Mn, one electric capacity C is connected between output voltage terminal Vout and earth terminal GND, the resistance R1 and the resistance R2 that are serially connected it is also connected with between output voltage terminal Vout and earth terminal GND, the point-shaped being connected between divider resistance becomes divider node, and voltage feedback signal is drawn from predetermined divider node place.
The BUCK type power supply changeover device of the mixture control of the present invention, control unit includes,
One error amplifier 6, for reference voltage V ref and voltage feedback signal Vfb is compared, obtains an error amplification signal；
One comparator 2, for error amplification signal and current detection signal are compared, produces a comparison signal；
One clock unit 5, is used for producing clock signal；
One PWM/PFM manipulator 1, PWM/PFM manipulator 1 connects clock signal, for producing PWM modulation signal or PFM modulation signal according to comparison signal and clock signal.
Control unit also includes zero cross detection circuit 7, a PWM/PFM manipulator 1 and is connected with zero cross detection circuit 7.
The BUCK type power supply changeover device of the mixture control of the present invention, PWM/PFM switching signal is produced by a logic control element 9, the input of logic control element 9 connects error amplification signal, in order to error amplification signal and one second reference voltage are compared, in order in the lower generation PWM/PFM switching signal that imposes a condition.PWM/PFM manipulator 1 also modulates switching between signal in PWM modulation signal or PFM under the effect of logic control element 9.Logic control element 9 amplifies signal and one second reference voltage by relative error, when less than the second reference voltage, during such as 0.4V reference voltage, entering PFM pattern, when more than the second reference voltage, enters PWM mode.PFM is also referred to as " economize on electricity " pattern.Work transducer in a power saving mode uses PFM pattern when light load currents, uses PWM mode under heavier load current conditions.This mode of operation makes transducer can all keep high efficiency in wide in range range of current output.
Time BUCK circuit of the present invention enters PFM pattern, reduce the oversampling ratio of electric current, make to run into the situation that load increases suddenly, electric current is still in little oversampling ratio state, so that output electric current increases, after the short time recovers, the oversampling ratio of current sampling circuit returns to normal value, with reference to shown in Fig. 6, it is possible to improve the transient response of circuit, to guarantee system stability.
The foregoing is only preferred embodiment of the present invention; not thereby restriction embodiments of the present invention and protection domain; to those skilled in the art; the equivalent replacement done by all utilizations description of the present invention and diagramatic content and the obtained scheme of apparent change should be can appreciate that, all should be included in protection scope of the present invention.
Claims (9)
1. the BUCK type power supply changeover device of a mixture control, it is characterised in that include,
One operating circuit being provided with energy-storage travelling wave tube；
One switching device group, modulates in a PWM modulation signal or a PFM and controls the alternately switching between charge mode and discharge mode of described operating circuit under signal function；
One control unit, in order to modulate signal from voltage feedback signal and a sampling of output voltage terminal from the current detection signal described PWM modulation signal of generation or the described PFM of described operating circuit according to a reference voltage, a sampling；
Described current detection signal is produced by a current sampling circuit, and described current sampling circuit is in the lower oversampling ratio changing electric current of effect of a PWM/PFM switching signal.
2. the BUCK type power supply changeover device of a kind of mixture control according to claim 1, it is characterised in that described current sampling circuit includes,
One current detecting anode and a current detecting negative terminal；
One differential amplification unit, it is provided with first input end and the second input, the first input resistance branch road it is connected between described first input end with described current detecting anode, described second input is connected the second input resistance branch road with described current detecting negative terminal, described first input resistance branch road connects one first switch, described second input resistance branch road connects a second switch, described first switch and described second switch under the effect of described PWM/PFM switching signal on or off to change input resistance size；
One arithmetic element, is connected with the outfan of described differential amplification unit, for the output signal of described differential amplification unit is processed, to export described current detection signal.
3. the BUCK type power supply changeover device of a kind of mixture control according to claim 2, it is characterized in that, described first input resistance branch road includes predetermined number and is connected in series with each other the resistance between described first input end and described current detecting anode, described first switch in parallel in the two ends of resistance at least one described under the effect of described PWM/PFM switching signal on or off.
4. the BUCK type power supply changeover device of a kind of mixture control according to claim 2, it is characterized in that, described second input resistance branch road includes predetermined number and is connected in series with each other the resistance between described second input and described current detecting negative terminal, and described second switch is parallel to the two ends of at least one described resistance on or off under the effect of described PWM/PFM switching signal.
5. the BUCK type power supply changeover device of a kind of mixture control according to claim 2, it is characterised in that described first switch and described second switch all adopt transmission gate, and the control end of described transmission gate is connected with described PWM/PFM switching signal.
6. the BUCK type power supply changeover device of a kind of mixture control according to claim 2, it is characterised in that described differential amplification unit includes,
First metal-oxide-semiconductor, the grid of described first metal-oxide-semiconductor is connected with drain electrode, and source electrode connects described first input end；
Second metal-oxide-semiconductor, the source ground of described second metal-oxide-semiconductor, drain electrode is connected with the drain electrode of described first metal-oxide-semiconductor；Grid connects an offset signal；
3rd metal-oxide-semiconductor, the grid of described 3rd metal-oxide-semiconductor is connected with the grid of described first metal-oxide-semiconductor, and source electrode connects described second input；
4th metal-oxide-semiconductor, the source electrode of described 4th metal-oxide-semiconductor is connected with the source electrode of described second metal-oxide-semiconductor, and grid is connected with the grid of described second metal-oxide-semiconductor, and drain electrode is connected with the drain electrode of described 3rd metal-oxide-semiconductor.
7. the BUCK type power supply changeover device of a kind of mixture control according to claim 1, it is characterised in that also including a current detecting branch road, described current detecting branch road includes,
One detection resistance, described current sampling circuit is parallel to described detection resistance two ends, in order to detect the electric current flowing through described detection resistance；
One is modulated signal by described PWM modulation signal or described PFM controls the detection control switch of break-make.
8. the BUCK type power supply changeover device of a kind of mixture control according to claim 1, it is characterised in that described control unit includes,
One error amplifier, for described reference voltage and described voltage feedback signal are compared, obtains an error amplification signal；
One comparator, for described error amplification signal and described current detection signal are compared, produces a comparison signal；
One clock unit, is used for producing clock signal；
One PWM/PFM manipulator, described PWM/PFM manipulator connects described clock signal, for producing described PWM modulation signal or described PFM modulation signal according to described comparison signal and described clock signal.
9. the BUCK type power supply changeover device of a kind of mixture control according to claim 8, it is characterized in that, described PWM/PFM switching signal is produced by a logic control element, the input of described logic control element connects described error amplification signal, in order to described error amplification signal and one second reference voltage are compared, in order in the described PWM/PFM switching signal of the lower generation that imposes a condition.
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| CN109856445A (en) * | 2019-03-21 | 2019-06-07 | 黄河科技学院 | A kind of current sampling circuit that DC error can be eliminated for BUCK converter |
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