CN106992665B - Feedback control circuit and its method - Google Patents
Feedback control circuit and its method Download PDFInfo
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- CN106992665B CN106992665B CN201610041015.1A CN201610041015A CN106992665B CN 106992665 B CN106992665 B CN 106992665B CN 201610041015 A CN201610041015 A CN 201610041015A CN 106992665 B CN106992665 B CN 106992665B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Power Engineering (AREA)
- Relay Circuits (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the present invention provides a kind of feedback control circuit and its method.Feedback control circuit includes voltage comparator, correction voltage generator and processor.Voltage comparator exports a reference voltage pulse signal after receiving mid-point voltage with correction voltage and compared with giving.Correction voltage generator is to generate correction voltage and be sent to switch driving circuit and voltage comparator.The pulse bandwidth of processor comparison reference voltage pulse signal and presetting voltage pulse signal and output control signal finely tunes the voltage value of correction voltage to correction voltage generator accordingly.Switch driving circuit, which adjusts according to the voltage value of correction voltage and exports one group of switch driving signal, adjusts switch opening and closing time to switching regulation circuit.
Description
Technical field
The present invention is particularly relating to one kind about a kind of feedback control circuit and being used to automatically correct in switching regulation circuit
Switch the feedback control circuit of opening and closing time.
Background technique
For current common switching regulaor, in order to improve efficiency of the switching regulaor in the case of underloading, when
When inductive current is reduced to zero, bridge switch can be closed, circuit is made to enter discontinuous mode (Discontinuous
Conduction Mode；DCM).The common practice be judge whether inductive current is down to zero using comparator, but due to than
There is its offset voltage compared with device, therefore can not accurately determine the time point of real zero inductor current, and causes bridge switch ahead of time in inductance
Electric current, which drops to before zero, closes, or has crossed after inductive current drops to zero time point and just closed, so that switching regulaor
Overall circuit efficiency decline.
Summary of the invention
The embodiment of the present invention provides a kind of feedback control circuit, to correct the switch opening and closing time of switching regulation circuit simultaneously
And switching regulation circuit is connected to switch driving circuit.Feedback control circuit include voltage comparator, correction voltage generator with
Processor.Voltage comparator exports a reference after receiving the mid-point voltage of switching regulation circuit with correction voltage and compared with giving
Voltage pulse signal.Correction voltage generator is electrically connected to voltage comparator and switch driving circuit, correction voltage generator
To generate correction voltage and be sent to switch driving circuit and voltage comparator.Processor is electrically connected reference voltage pulse wave
Signal and presetting voltage pulse signal, and comparison reference voltage pulse signal and the pulse wave of presetting voltage pulse signal are wide
It spends and output control signal finely tunes the voltage value of correction voltage to correction voltage generator accordingly.Switch driving circuit is according to school
The voltage value of positive voltage adjusts and one group of switch driving signal of output adjusts switch opening and closing time to switching regulation circuit.
The present invention in one embodiment, when the pulse bandwidth of reference voltage pulse signal is greater than default constant voltage arteries and veins
When the pulse bandwidth of wave signal, then correction voltage generator downgrades the voltage value of correction voltage according to control signal.On the other hand,
When the pulse bandwidth of reference voltage pulse signal is less than the pulse bandwidth of presetting voltage pulse signal, then correction voltage generates
Device increases the voltage value of correction voltage according to control signal.
The present invention in one embodiment, wherein processor include the first counter, the second counter and controller.
First counter is electrically connected voltage comparator to receive reference voltage pulse signal, and by the arteries and veins of reference voltage pulse signal
Wave width is converted to the first count value.Second counter electrically receives presetting voltage pulse signal, and by default constant voltage
The pulse bandwidth of pulse signal is converted to the second count value.Controller is electrically connected first and second counter to receive respectively
One and second count value and numerical value comparison is carried out, numerical value comparison result output control signal to correction voltage generates whereby
Device is to finely tune the voltage value of correction voltage.
The embodiment of the present invention provides a kind of feedback control method, and for feedback control circuit and feedback control circuit includes
Voltage comparator, correction voltage generator and processor, wherein switch of the feedback control circuit to correct switching regulation circuit
Opening and closing time and switching regulation circuit are connected to switch driving circuit, and correction voltage generator is electrically connected to voltage comparator
With switch driving circuit and processor is electrically connected voltage comparator and correction voltage generator.Feedback control method include with
Lower step: penetrating voltage comparator, receive the mid-point voltage of switching regulation circuit with correction voltage and compared with giving after export
Reference voltage pulse signal；Through correction voltage generator, generates correction voltage and be sent to switch driving circuit and voltage
Comparator；And penetrate processor, receive presetting voltage pulse signal and comparison reference voltage pulse signal with it is presetting
The pulse bandwidth of voltage pulse signal and accordingly output control signal finely tune the voltage of correction voltage to correction voltage generator
Value, wherein switch driving circuit, which adjusts according to the voltage value of correction voltage and exports one group of switch, drives signal to switch-mode regulation electricity
Road is to adjust switch opening and closing time.
In conclusion feedback control circuit and feedback control method that the embodiment of the present invention is proposed, through comparison reference
The pulse bandwidth of voltage pulse signal and presetting voltage pulse signal and accordingly output control signal are to correction voltage generator
To finely tune the voltage value of correction voltage.Later, it adjusts and exports according to the voltage value of correction voltage through switch driving circuit
One group of switch driving signal adjusts switch opening and closing time to switching regulation circuit.Next, through adjustment switch opening and closing time
Bridge switch is accurately closed, so when switching regulation circuit switches at light load from heavy duty, electricity in switching regulation circuit
Inducing current will not generate negative current, therefore be able to ascend the whole efficiency of switching regulation circuit.
Be further understood that feature and technology contents of the invention to be enabled, please refer to below in connection with it is of the invention specifically
Bright and attached drawing, but these explanations are intended merely to illustrate the present invention with institute's accompanying drawings, rather than interest field of the invention is appointed
What limitation.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the feedback control circuit according to depicted in exemplifying embodiments.
Fig. 2 is the waveform diagram of the inductive current according to depicted in exemplifying embodiments.
Fig. 3 is the circuit block diagram according to feedback control circuit depicted in the illustrative another embodiment of the present invention.
Fig. 4 is the flow chart of the feedback control method according to depicted in exemplifying embodiments.
Symbol description
100: feedback control circuit
110: voltage comparator
120: processor
122: the first counters
124: the second counters
126: controller
130: correction voltage generator
140: switching regulation circuit
150: switch driving circuit
CS: control signal
CLK: time pulse signal
COUT: capacitor
CUT1: the first count value
CUT2: the second count value
GND: ground voltage
LX: mid-point voltage
LOUT: inductance
MP: switch on the bridge
MN: bridge switch
NG: bridge switch drives signal
PG: switch on the bridge drives signal
S410, S420, S430: step
VZ: reference voltage pulse signal
VTH: correction voltage
VDD: supply voltage
VOUT: output voltage
VW: presetting voltage pulse signal
WTH: pulse bandwidth
R: resistance
IL: inductive current
ZTH: pulse bandwidth
Specific embodiment
Schema will be cooperated to illustrate the feedback control circuit with various embodiments below, however, following embodiments are not
To limit the present invention.
(embodiment of feedback control circuit)
It is the feedback control circuit according to depicted in exemplifying embodiments referring to Fig. 1 and Fig. 2, Fig. 1
Circuit block diagram, Fig. 2 are the waveform diagram of the inductive current according to depicted in exemplifying embodiments.As shown in Figure 1,
Feedback control circuit 100 includes voltage comparator 110, processor 120 and correction voltage generator 130.Feedback control circuit 100
To correct the switch opening and closing time of switching regulation circuit 140, and switching regulation circuit 140 is connected to switch driving circuit
150.The positive input of voltage comparator 110 is connected to switching regulation circuit 140, and the reversed input of voltage comparator 110
End is connected to correction voltage generator 130.Correction voltage generator 130 is electrically connected switch driving circuit 150.Processor 120
It is electrically connected the output end and correction voltage generator 130 of voltage comparator 110.
About switching regulation circuit 140, switching regulation circuit 140 includes switch on the bridge MP, bridge switch MN, inductance
LOUT, resistance R and capacitor COUT, wherein group switch driving signal includes that switch on the bridge driving signal PG and bridge switch drive
Signal NG.The gate of switch on the bridge MP receives switch on the bridge and drives signal PG, and the source electrode of switch on the bridge MP receives supply voltage
VDD.The gate of bridge switch MN receives bridge switch and drives signal NG, and the drain connection switch on the bridge MP's of bridge switch MN draws
The source electrode of pole, bridge switch MN connects ground voltage GND, and wherein mid-point voltage LX is the drain voltage of bridge switch MN.Inductance
The drain of one end connection bridge switch MN of LOUT.The other end of one end connection inductance LOUT of resistance R.One end of capacitor COUT
The other end of resistance R is connected, the other end of capacitor COUT connects ground voltage GND.Switching regulation circuit 140 is through Shang Qiao under
Low frequency filtering of the switching of bridge switch MP and MN to generate continuous pulse signal and be formed through inductance LOUT and capacitor COUT
Device generates a DC voltage.Output voltage VO UT provides steady dc voltage level and is sent to a heavy duty or a underloading.
In the following description, the working principle of feedback control circuit 100 will be further described.
In the present embodiment, voltage comparator 110 receives the mid-point voltage LX and correction voltage of switching regulation circuit 140
VTH and a reference voltage pulse signal VZ is exported to processor 120 after giving, wherein correction voltage VTH is by correcting
Produced by voltage generator 130.Next, processor 120 receives reference voltage pulse signal VZ and presetting voltage pulse is interrogated
The pulse bandwidth of number VW and comparison reference voltage pulse signal VZ and presetting voltage pulse signal VW, and then according to comparing knot
Fruit output control signal CS finely tunes the voltage value of correction voltage VTH and newly generated correction to correction voltage generator 130
The voltage value of voltage VTH can be fed back to switch driving circuit 150.Specifically, when the pulse wave of reference voltage pulse signal VZ is wide
When spending pulse bandwidth WTH of the ZTH greater than presetting voltage pulse signal VW, then correction voltage generator 130 is according to control signal
CS downgrades the voltage value of correction voltage VTH to correspond to.When the pulse bandwidth ZTH of reference voltage pulse signal VZ is less than presetting electricity
When the pulse bandwidth WTH of pressure pulse wave signal VW, then correction voltage generator 130 is corresponded to according to control signal CS increases correction electricity
The voltage value of pressure, wherein the pulse bandwidth WTH of above-mentioned presetting voltage pulse signal VW is predetermined width value.Finally, switch
Driving circuit 150, which can adjust according to the voltage value of correction voltage VTH and export one group of switch, drives signal PG and NG to adjust to switching
Road 140 economize on electricity to adjust switch opening and closing time.In this way, which it is quasi- to adjust switch opening and closing time through switch driving circuit 150
Bridge switch MN really is closed, therefore as shown in Fig. 2, when switching regulation circuit 140 switches at light load (as shown in Figure 2 from heavy duty
Heavy duty waveform switch to underloading waveform), the inductive current IL in switching regulation circuit 140 will not generate negative current (by
Fig. 2 show each section that IL (t) in the waveform of underloading is zero), therefore it is able to ascend the whole effect of switching regulation circuit 140
Rate.
In next multiple embodiments, description is different to the part of above-mentioned Fig. 1 embodiment, and remaining clipped
It is identical as the part of above-mentioned Fig. 1 embodiment.In addition, similar reference number or label instruction are similar to illustrate conventionally
Component.
(another embodiment of feedback control circuit)
Referring to figure 3., Fig. 3 is the circuit side according to feedback control circuit depicted in the illustrative another embodiment of the present invention
Block figure.Unlike above-mentioned Fig. 1 embodiment, the processor 120 of the present embodiment includes the first counter 122, the second counter
124 with controller 126.First counter 122 is electrically connected between the output end and controller 126 of voltage comparator 110, control
Device 126 is electrically connected the first counter 122, the second counter 124, with correction voltage generator 130.
Specifically, the first counter 122 receives reference voltage pulse signal VZ and by reference voltage pulse signal VZ
Pulse bandwidth be converted to the first count value CUT1.In addition, the second counter electrically receives presetting voltage pulse signal VW, and
And the pulse bandwidth of presetting voltage pulse signal VW is converted into the second count value CUT2.It should be noted that first and second
Counter, which can synchronize, receives time pulse signal CLK, and the second count value CUT2 is pre-set count values.Next, 126 meeting of controller
First and second count value CUT1, CUT2 is received respectively and is carried out numerical value comparison, whereby numerical value comparison result output control
Signal CS processed finely tunes the voltage value of correction voltage VTH, and the voltage of this correction voltage VTH to correction voltage generator 130
Value can be fed back to switch driving circuit 150 to adjust and switch driving signal PG and NG, and then adjust switch on the bridge MP and lower bridge
The switch opening and closing time of switch MN.
When the first count value CUT1 is greater than the second count value CUT2, then correction voltage generator 130 can be interrogated according to control
Number CS downgrades the voltage value of correction voltage VTH.On the other hand, when the first count value CUT1 is less than the second count value CUT2,
Then correction voltage generator 130 can increase the voltage value of correction voltage VTH according to control signal CS.Through above-mentioned working machine
System, when switching regulation circuit 140 switches at light load from heavy duty, the inductive current IL in switching regulation circuit 140 will not be generated
Negative current, therefore it is able to ascend the whole efficiency of switching regulation circuit 140.
(embodiment of feedback control method)
Referring to figure 4., Fig. 4 is the flow chart according to the feedback control method of the embodiment of the present invention.Method described in this example
It can execute in Fig. 1 or feedback control circuit shown in Fig. 3, therefore please be understood together according to Fig. 1 or Fig. 3 with benefit.
Feedback control method the following steps are included: through voltage comparator, receive the mid-point voltage of switching regulation circuit with
Correction voltage and give output reference voltage pulse signal (step S410) after comparison.Through correction voltage generator, generate
Correction voltage and it is sent to switch driving circuit and voltage comparator (step S420).Through processor, presetting electricity is received
The pulse bandwidth of pressure pulse wave signal and comparison reference voltage pulse signal and presetting voltage pulse signal and accordingly output are controlled
Signal processed finely tunes the voltage value of correction voltage to correction voltage generator, and wherein switch driving circuit is according to the electricity of correction voltage
One group of switch driving signal of the adjustment of pressure value and output adjusts switch opening and closing time (step S430) to switching regulation circuit.
The correlative detail of each step of feedback control method about feedback control circuit is in above-mentioned FIG. 1 to FIG. 3 embodiment
It has been be described in detail that, herein without repeating.
Herein it should be noted that, each step of Fig. 4 embodiment only for convenience of description need, the embodiment of the present invention not with
The sequence of each step to each other is as the restrictive condition for implementing each embodiment of the present invention.
(possibility effect of embodiment)
In conclusion feedback control circuit and feedback control method that the embodiment of the present invention is proposed, through comparison reference
The pulse bandwidth of voltage pulse signal and presetting voltage pulse signal and accordingly output control signal are to correction voltage generator
To finely tune the voltage value of correction voltage.Later, it adjusts and exports according to the voltage value of correction voltage through switch driving circuit
One group of switch driving signal adjusts switch opening and closing time to switching regulation circuit.Next, through adjustment switch opening and closing time
Bridge switch is accurately closed, so when switching regulation circuit switches at light load from heavy duty, electricity in switching regulation circuit
Inducing current will not generate negative current, therefore be able to ascend the whole efficiency of switching regulation circuit.
The above description is only an embodiment of the present invention, not to limit to the scope of the patents of the invention.
Claims (10)
1. a kind of feedback control circuit, to correct the switch opening and closing time and switch-mode regulation electricity of a switching regulation circuit
Road is connected to a switch driving circuit, which includes:
One voltage comparator, receive a mid-point voltage of the switching regulation circuit with a correction voltage and compared with giving after export
One reference voltage pulse signal；
One correction voltage generator, is electrically connected to the voltage comparator and the switch driving circuit, the correction voltage generator
To generate the correction voltage and be sent to the switch driving circuit and the voltage comparator；And
One processor is electrically connected the reference voltage pulse signal and a presetting voltage pulse signal, and compares the reference
The pulse bandwidth of voltage pulse signal and the presetting voltage pulse signal and accordingly output one control signal to the correction voltage
Generator to increase or downgrade the voltage value of the correction voltage,
Wherein the switch driving circuit, which adjusts according to the voltage value of the correction voltage and exports one group of switch, drives signal to open to this
It closes and adjusts circuit to adjust the switch opening and closing time.
2. feedback control circuit according to claim 1,
Wherein when the pulse bandwidth of the reference voltage pulse signal is greater than the pulse bandwidth of the presetting voltage pulse signal, then
The correction voltage generator downgrades the voltage value of the correction voltage according to the control signal；And
Wherein when the pulse bandwidth of the reference voltage pulse signal is less than the pulse bandwidth of the presetting voltage pulse signal, then
The correction voltage generator increases the voltage value of the correction voltage according to the control signal.
3. feedback control circuit according to claim 1, wherein group switch driving signal drives including a switch on the bridge
Signal and a bridge switch drive signal, and the switching regulation circuit includes:
One switch on the bridge, gate receive switch on the bridge driving signal, and source electrode receives a supply voltage；And
One bridge switch, gate receive bridge switch driving signal, and drain connects the drain of the switch on the bridge, source electrode
A ground voltage is connected, wherein the mid-point voltage is the drain voltage of the bridge switch；
One inductance, one end connect the drain of the bridge switch；
One resistance, one end connect the other end of the inductance；And
One capacitor, one end connect the other end of the resistance, and the other end connects the ground voltage.
4. feedback control circuit according to claim 1, wherein the processor includes:
One first counter is electrically connected the voltage comparator to receive the reference voltage pulse signal, and by this with reference to electricity
The pulse bandwidth of pressure pulse wave signal is converted to the first count value；
One second counter, electrically receives the presetting voltage pulse signal, and by the arteries and veins of the presetting voltage pulse signal
Wave width is converted to one second count value；And
One controller, be electrically connected this first and second counter first and second count value and given with receiving this respectively
To carry out numerical value comparison, numerical value comparison result exports the control signal to the correction voltage generator to finely tune correction electricity whereby
The voltage value of pressure.
5. feedback control circuit according to claim 4, wherein this first and second counter synchronisation receive a clock pulse
Signal, and second count value is a pre-set count values.
6. feedback control circuit according to claim 4,
Wherein when first count value is greater than second count value, then the correction voltage generator is downgraded according to the control signal
The voltage value of the correction voltage；And
Wherein when first count value is less than second count value, then the correction voltage generator is increased according to the control signal
The voltage value of the correction voltage.
7. a kind of feedback control method, for a feedback control circuit and the feedback control circuit include a voltage comparator,
One correction voltage generator and a processor, wherein the feedback control circuit is opened to correct a switch of a switching regulation circuit
It closes the time and the switching regulation circuit is connected to a switch driving circuit, which is electrically connected to the voltage
Comparator is with the switch driving circuit and the processor is electrically connected the voltage comparator and the correction voltage generator, this time
Awarding control method includes:
Through the voltage comparator, receive a mid-point voltage of the switching regulation circuit with a correction voltage and compared with giving after
Export a reference voltage pulse signal；
Through the correction voltage generator, generates a correction voltage and be sent to the switch driving circuit compared with the voltage
Device；And
Through the processor, receives a presetting voltage pulse signal and to compare the reference voltage pulse signal presetting with this
The pulse bandwidth of voltage pulse signal and accordingly one control signal of output are to the correction voltage generator to increase or downgrade the school
The voltage value of positive voltage, wherein the switch driving circuit adjusts according to the voltage value of the correction voltage and exports one group of switch driving
Signal adjusts the switch opening and closing time to the switching regulation circuit.
8. feedback control method according to claim 7,
Wherein when the pulse bandwidth of the reference voltage pulse signal is greater than the pulse bandwidth of the presetting voltage pulse signal, then
The correction voltage generator downgrades the voltage value of the correction voltage according to the control signal；And
Wherein when the pulse bandwidth of the reference voltage pulse signal is less than the pulse bandwidth of the presetting voltage pulse signal, then
The correction voltage generator increases the voltage value of the correction voltage according to the control signal.
9. feedback control method according to claim 7, wherein the processor includes:
One first counter is electrically connected the voltage comparator to receive the reference voltage pulse signal, and by this with reference to electricity
The pulse bandwidth of pressure pulse wave signal is converted to the first count value；
One second counter, electrically receives the presetting voltage pulse signal, and by the arteries and veins of the presetting voltage pulse signal
Wave width is converted to one second count value；And
One controller, be electrically connected this first and second counter first and second count value and given with receiving this respectively
To carry out numerical value comparison, numerical value comparison result exports the control signal to correction voltage generator to finely tune the correction voltage whereby
Voltage value.
10. feedback control method according to claim 9,
Wherein when first count value is greater than second count value, then the correction voltage generator is downgraded according to the control signal
The voltage value of the correction voltage；And
Wherein when first count value is less than second count value, then the correction voltage generator is increased according to the control signal
The voltage value of the correction voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610041015.1A CN106992665B (en) | 2016-01-21 | 2016-01-21 | Feedback control circuit and its method |
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|---|---|---|---|
| CN201610041015.1A CN106992665B (en) | 2016-01-21 | 2016-01-21 | Feedback control circuit and its method |
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| CN106992665B true CN106992665B (en) | 2019-05-21 |
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| CN101645651A (en) * | 2008-08-08 | 2010-02-10 | 立锜科技股份有限公司 | Voltage regulator and control method thereof |
| TW201212497A (en) * | 2010-09-15 | 2012-03-16 | Richtek Technology Corp | Switching regulator and control circuit and control method thereof |
| CN104201887A (en) * | 2014-09-01 | 2014-12-10 | 矽力杰半导体技术(杭州)有限公司 | Zero crossing regulating circuit and zero crossing regulating method of buck converter |
| CN104467364A (en) * | 2014-12-15 | 2015-03-25 | 矽力杰半导体技术(杭州)有限公司 | Zero cross detection circuit and switching power source |
| TW201535085A (en) * | 2014-03-14 | 2015-09-16 | Realtek Semiconductor Corp | Switching regulator with ripple-based control and method for switching regulator with ripple-based control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012100376A (en) * | 2010-10-29 | 2012-05-24 | Mitsumi Electric Co Ltd | Switching power supply device |
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2016
- 2016-01-21 CN CN201610041015.1A patent/CN106992665B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645651A (en) * | 2008-08-08 | 2010-02-10 | 立锜科技股份有限公司 | Voltage regulator and control method thereof |
| TW201212497A (en) * | 2010-09-15 | 2012-03-16 | Richtek Technology Corp | Switching regulator and control circuit and control method thereof |
| TW201535085A (en) * | 2014-03-14 | 2015-09-16 | Realtek Semiconductor Corp | Switching regulator with ripple-based control and method for switching regulator with ripple-based control |
| CN104201887A (en) * | 2014-09-01 | 2014-12-10 | 矽力杰半导体技术(杭州)有限公司 | Zero crossing regulating circuit and zero crossing regulating method of buck converter |
| CN104467364A (en) * | 2014-12-15 | 2015-03-25 | 矽力杰半导体技术(杭州)有限公司 | Zero cross detection circuit and switching power source |
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| CN106992665A (en) | 2017-07-28 |
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