CN105226935B - Warbled Switching Power Supply is realized based on divided oscillator device - Google Patents
Warbled Switching Power Supply is realized based on divided oscillator device Download PDFInfo
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- CN105226935B CN105226935B CN201410234253.5A CN201410234253A CN105226935B CN 105226935 B CN105226935 B CN 105226935B CN 201410234253 A CN201410234253 A CN 201410234253A CN 105226935 B CN105226935 B CN 105226935B
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Abstract
Warbled Switching Power Supply is realized based on divided oscillator device, is related to a kind of switching power circuit.Including：One is provided with the operating circuit of energy-storage travelling wave tube, switches under pulse-modulated signal effect between charge and discharge mode；One control circuit, to according to a reference voltage, a voltage feedback signal, a current detection signal and a clock signal generation pulse-modulated signal；Control circuit includes, an error amplifier, for obtaining an error amplification signal；Clock signal generator includes, clock division unit, and multiple clock signals with different frequency are generated under the action of a reference clock source；Selecting unit selects one of output to control circuit under the action of error amplification signal from multiple clock signals.The present invention generates the clock signal of multiple setpoint frequencies by divided oscillator device, and passes through error amplification signal in the clock signal of setpoint frequency all the way is selected to export to control circuit in setting time so that cycle stability reduces the ripple of output voltage.
Description
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of switching power circuit.
Background technology
The substantially linear regulated power supply of the power supply that modern electronic equipment uses and two major class of switching power supply, linear voltage stabilization
Power supply is that its adjustment pipe is operated in amplification region, and this regulated power supply will not introduce extra interference, but volume is larger, power
Transformer and power tube are depended primarily upon, and conversion efficiency is low；Switching Power Supply compared with linear stabilized power supply, have small power consumption,
Small, the features such as voltage stabilized range is wide, Switching Power Supply utilize modern power electronics technology, control switch device conductive and shut-off
Time ratio maintains to stabilize the output voltage, and pulse frequency modulated mode is generally applied to Switching Power Supply to improve light load effect
Rate, the switch power converter to work in a power saving mode use pulse frequency modulated pattern under the conditions of light load currents,
Pulse-width-modulated mode is used under heavier load current conditions.However, due to pulse frequency modulated mode control method less
Easily, not as good as pulse width modulation is widely used thus in switching power circuit.In the prior art, in order to improve light load or
Circuit efficiency under waiting condition, there is provided a kind of low-power consumption modes, are also referred to as：Hop cycle control model (Skip Cycle Mode),
When circuit is in underloading or waiting condition, control PWM controller intermittently sends pulse signal, to realize under constant frequency
By reducing on-off times, increase duty cycle to improve underloading and standby efficiency, the impulse modulation letter of hop cycle control model
The oscillogram of number PFM1 is as shown in Figure 1, however this method can cause that output ripple is higher, and control method is unsatisfactory.
The content of the invention
Warbled Switching Power Supply is realized based on divided oscillator device it is an object of the present invention to provide one kind, solve with
Upper technical problem.
Following technical scheme may be employed to realize in technical problem solved by the invention：
Warbled Switching Power Supply is realized based on divided oscillator device, wherein, including：
One switching device group acts on lower alternate conduction or shut-off in a pulse-modulated signal；
One is provided with the operating circuit of energy-storage travelling wave tube, in charge mode and electric discharge mould under the action of the switching device group
Switch between formula；
One control circuit, to be believed according to a reference voltage, a voltage feedback signal, a current detection signal and a clock
Number generation pulse-modulated signal；
The control circuit includes,
One error amplifier, for compared with the voltage feedback signal, obtaining an error to the reference voltage
Amplified signal；
One clock signal generator adjusts clock signal under the action of the error amplification signal；The clock signal
Generator includes,
Clock division unit generates multiple clock signals with different frequency under the action of a reference clock source；
Selecting unit selects one of connect under the action of the error amplification signal from multiple clock signals
It connects and exports to the control circuit.
Preferably, the selecting unit includes the switching branches of multiple parallel connections, and each switching branches connect the clock point
The clock signal of one setpoint frequency of frequency unit output；In multiple switching branches all the way in the error amplification signal
Under the action of in being turned in setting time.
Preferably, the selecting unit include a buffer, the selected clock signal by the buffer with
The control circuit connection.
Preferably, one switch of series connection, the error amplification signal are converted by an analog-digital converter in each switching branches
To be connected to the control terminal of the switch after digital signal, to make different open when the error amplification signal changes
Close conducting.
Preferably, the clock division unit includes multiple cascade d type flip flops, and the QN ends of each d type flip flop connect
The clock pulse input terminal of next d type flip flop is connect, the QN ends of each d type flip flop also feed back to the same D and touch
The signal input part of device is sent out, the clock pulse input terminal of first d type flip flop connects the reference clock source, the last one
The QN ends of the d type flip flop only feed back to the signal input part of the same d type flip flop；The Q ends of each d type flip flop are used for
Export it is divided after clock signal.
Preferably, the clock division unit includes three cascade d type flip flops, is respectively the first d type flip flop, the 2nd D
Trigger and 3d flip-flop, the selecting unit include first switch branch, second switch branch, the 3rd switching branches, institute
The first output terminal for stating the first d type flip flop exports the clock signal of the first setpoint frequency；First output of second d type flip flop
The clock signal of the second setpoint frequency of end output；First output terminal of the 3d flip-flop export the 3rd setpoint frequency when
Clock signal；One in the first switch branch, second switch branch, the 3rd switching branches under the action of error amplification signal
Road turns on, and the clock signal of setpoint frequency all the way is provided to the control circuit.
Preferably, the control circuit further includes,
One first comparator, for compared with the current detection signal, generating one to the error amplification signal
Comparison signal；
One PWM controller generates the pulse-modulated signal according to the comparison signal and the clock signal.
Preferably, the operating circuit includes：
One charge control branch is connected to an Input voltage terminal and one first and crosses between node；
One charge and discharge branch is connected to described first and crosses between node and an output voltage terminal；
One control of discharge branch is connected to described first and crosses between node and a ground terminal, the energy-storage travelling wave tube series connection
In charge and discharge branch road；
For the operating circuit when charge mode, the switching device group controls the charge control branch and the charge and discharge
Electric branch conducting, and the control of discharge branch is controlled to disconnect, the electric current of the input terminal input is made to fill the energy-storage travelling wave tube
Electricity；
For the operating circuit when discharge mode, the switching device group controls the control of discharge branch and the charge and discharge
Electric branch conducting, and the charge control branch is controlled to disconnect, the energy-storage travelling wave tube is made to discharge the output terminal.
Preferably, the control circuit further includes,
One feedback network is connected between the output voltage terminal and the ground terminal, to generate the Voltage Feedback
Signal；
One current detection circuit, the controllable Input voltage terminal and described first that is parallel to cross between node, use
To generate the current detection signal according to pulse-modulated signal.
Preferably, the current detection circuit includes：
One detection resistance is series on the current detection circuit；
One detection compensating unit connects the both ends of the detection resistance, to detect the electric current for flowing through the detection resistance；
The detection control switch of one signal control break-make pulsed, is connected on the current detection circuit.
Advantageous effect：Due to using the technology described above, the present invention generates multiple setpoint frequencies by divided oscillator device
Clock signal, and pass through error amplification signal and exported in the clock signal for selecting setpoint frequency all the way in setting time to control electricity
Road so that cycle stability reduces the ripple of output voltage.
Description of the drawings
Fig. 1 is the oscillogram of the pulse-modulated signal PFM1 of the prior art；
Fig. 2 is the electrical block diagram of the present invention；
Fig. 3 is the circuit diagram of the clock signal generator of the present invention；
Fig. 4 is the oscillogram of the pulse-modulated signal PFM2 of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The invention will be further described in the following with reference to the drawings and specific embodiments, but not as limiting to the invention.
With reference to Fig. 2, Fig. 3, warbled Switching Power Supply is realized based on divided oscillator device, wherein, including：
One switching device group acts on lower alternate conduction or shut-off in a pulse-modulated signal；
One is provided with the operating circuit of energy-storage travelling wave tube, under the action of switching device group in charge mode and discharge mode it
Between switch；
One control circuit, to according to a reference voltage Vref 1, a voltage feedback signal Vfb, a current detection signal and
One clock signal generation pulse-modulated signal；
Control circuit includes
One error amplifier 1, for compared with voltage feedback signal Vfb, obtaining an error to reference voltage Vref 1
Amplified signal EAout；
One clock signal generator 2, clock signal is adjusted under the action of error amplification signal EAout；Clock signal is produced
Raw device 2, including,
Clock division unit 221 generates multiple clocks with different frequency under the action of a reference clock source 2211
Signal；
Selecting unit 222 selects one of connect under the action of error amplification signal EAout from multiple clock signals
It connects and exports to control circuit.
As a kind of preferred embodiment of the present invention, selecting unit 222 includes the switching branches of multiple parallel connections, Mei Yikai
Close the clock signal of a setpoint frequency of 221 output of branch connection clock division unit；In multiple switch branch all the way in
In being turned in setting time under the action of error amplification signal EAout.
As a kind of preferred embodiment of the present invention, selecting unit 222 includes a buffer 22, when selected described
Clock signal is connected by buffer 22 with control circuit.
As a kind of preferred embodiment of the present invention, a switch of connecting in each switching branches, error amplification signal
EAout is converted to the control terminal that switch is connected to after digital signal by an analog-digital converter 21.To amplify in the error
Make different switch conductions when signal changes.P-channel MOSFET or N-channel MOS FET may be employed in switch.
As a kind of preferred embodiment of the present invention, clock division unit 221 includes multiple cascade d type flip flops, often
One d type flip flop includes signal input part D, clock pulse input terminal CK and Q ends, QN ends, and the QN ends connection of a d type flip flop is next
The clock pulse input terminal CK of d type flip flop, the signal at the QN ends of each d type flip flop feed back to the signal input of same d type flip flop
D is held, wherein the clock pulse input terminal CK connections reference clock source 2211 of first d type flip flop.The QN of the last one d type flip flop
End only feeds back to the signal input part D of same d type flip flop；The Q ends of each d type flip flop be used for export it is divided after clock letter
Number.
As a kind of preferred embodiment of the present invention, clock division unit 221 includes three cascade d type flip flops, point
Not Wei the first d type flip flop DFF1, the second d type flip flop DFF2 and 3d flip-flop DFF3, selecting unit 222 include first switch
Branch, second switch branch, the 3rd switching branches, first switch branch road are equipped with first switch S3, and second switch branch road is set
There is second switch S4, the 3rd switching branches are equipped with the 3rd switch S5, and the Q ends of the first d type flip flop export the first setpoint frequency
Clock signal；The Q ends of second d type flip flop export the clock signal of the second setpoint frequency；First output terminal of 3d flip-flop is defeated
Go out the clock signal of the 3rd setpoint frequency；First switch branch, second switch branch under the action of error amplification signal EAout
Conducting all the way in road, the 3rd switching branches provides the clock signal of setpoint frequency all the way to control circuit.The first of the present invention
Switch S3, the switches of second switch S4 and the 3rd S5 may be employed N-channel MOS FET and/or P-channel MOSFET and realize.
According to the actual needs of system, the d type flip flop that other quantity may be employed realizes that the present invention can also use other
The trigger of type or other kinds of clock source generate the clock signal of above-mentioned different set frequency.
As a kind of preferred embodiment of the present invention, control circuit further includes,
One first comparator 3, for compared with current detection signal, generating a ratio to error amplification signal EAout
Compared with signal；
One PWM controller 5, PWM controller 5 connect clock signal, and pulse tune is generated according to comparison signal and clock signal
Signal processed.
As a kind of preferred embodiment of the present invention, operating circuit includes：
One charge control branch is connected to an Input voltage terminal VDD and one first and crosses between node Lx；
One charge and discharge branch is connected to first and crosses between node Lx and an output voltage terminal Vout；
One control of discharge branch is connected to first and crosses between node Lx and a ground terminal GND, and energy-storage travelling wave tube, which is series at, to be filled
In discharge paths；
Operating circuit is when charge mode, first switch device group control charge control branch and the conducting of charge and discharge branch,
And control of discharge branch is controlled to disconnect, the electric current that input terminal inputs is made to charge energy-storage travelling wave tube；
Operating circuit is when discharge mode, first switch device group control control of discharge branch and the conducting of charge and discharge branch,
And charge control branch is controlled to disconnect, energy-storage travelling wave tube is made to discharge output terminal.
As a kind of preferred embodiment of the present invention, control circuit further includes,
One feedback network is connected between output voltage terminal Vout and ground terminal GND, to generate voltage feedback signal；
One current detection circuit, the controllable Input voltage terminal VDD and first that is parallel to crosses between node Lx, to root
Current detection signal is generated according to pulse-modulated signal.
As a kind of preferred embodiment of the present invention, feedback network is mainly formed by a resistor voltage divider circuit, resistance point
Volt circuit includes predetermined number and is connected in series with each other the divider resistance between output voltage terminal Vout and ground terminal GND,
The dot being connected between divider resistance is into divider node；
Feedback voltage signal is drawn from predetermined divider node.
A kind of specific embodiment, feedback network include the first resistor R1 being serially connected and second resistance R2, feedback voltage
Signal is drawn from the node that first resistor R1 is connected with second resistance R2.
As a kind of preferred embodiment of the present invention, current detection circuit includes：
One detection resistance Rb, is series on current detection circuit；
One detection compensating unit 4, the both ends of connecting detection resistance Rb, to detect the electric current for flowing through detection resistance；
The detection control switch Mp2 of one signal control break-make pulsed, is connected on current detection circuit.
Detection compensating unit 4 is also connected with clock signal, for being compensated to detection electric current, it is therefore intended that stabling current
Detection loop.
As a kind of preferred embodiment of the present invention, energy-storage travelling wave tube of the invention uses inductance component L, output end vo ut
A filter capacitor C1 is also connected between ground terminal GND.
As a kind of preferred embodiment of the present invention, control circuit further includes a zero cross detection circuit 6, zero passage detection electricity
The output terminal on road 6 is connected with PWM controller 5.In switching power circuit, when loading larger, inductive current is in whole cycle
Zero is not returned to inside so that circuit is generally in continuous conduction mode, but when load current continues to decline and low to a certain critical
During value, first switch pipe Mp and second switch pipe Mn may be simultaneously closed off in one cycle, at this time the Working mould of inductive current
Formula is known as discontinuous conduction mode, and the electric current on inductance is zero during this period, when under discontinuous inductive current pattern, due to becoming
The influence of the factors such as logical delay, wire delay and parasitism inside parallel operation, when causing the load current to continue to drop to critical value,
Two switching tube Mn are not turned off or are not completely off, and electric current can be caused to pour in down a chimney at this time so that output voltage sends great
Fluctuation influences the performance indicator of system, by setting zero cross detection circuit 6 for preventing electric current from pouring in down a chimney, avoids the above problem, can
It is realized with zero cross detection circuit using the prior art, therefore not to repeat here.
The present invention generates the clock signal of multiple setpoint frequencies by divided oscillator device, and passes through error amplification signal in setting
The interior clock signal for selecting setpoint frequency all the way of fixing time is exported to control circuit so that cycle stability reduces output voltage
Ripple.The oscillogram of pulse-modulated signal PFM2 as shown in Figure 4 compares pulse-modulated signal shown in FIG. 1, and cycle stability is real
Now reduce the purpose of the ripple of output voltage.
The foregoing is merely preferred embodiments of the present invention, not thereby limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent substitution and obviously change obtained scheme, should all include within the scope of the present invention.
Claims (7)
1. warbled Switching Power Supply is realized based on divided oscillator device, which is characterized in that including：
One switching device group acts on lower alternate conduction or shut-off in a pulse-modulated signal；
One is provided with the operating circuit of energy-storage travelling wave tube, under the action of the switching device group in charge mode and discharge mode it
Between switch；
One control circuit, to be given birth to according to a reference voltage, a voltage feedback signal, a current detection signal and a clock signal
Into pulse-modulated signal；
The control circuit includes,
One error amplifier, for compared with the voltage feedback signal, obtaining error amplification to the reference voltage
Signal；
One first comparator compares for compared with the current detection signal, generating one to the error amplification signal
Signal；
One PWM controller generates the pulse-modulated signal according to the comparison signal and the clock signal；
One clock signal generator adjusts clock signal under the action of the error amplification signal；Including,
Clock division unit generates multiple clock signals with different frequency under the action of a reference clock source；
Selecting unit selects one of connection simultaneously under the action of the error amplification signal from multiple clock signals
It exports to the control circuit；
The selecting unit includes the switching branches of multiple parallel connections, and each switching branches connect the clock division unit output
The clock signal of one setpoint frequency；In multiple switching branches all the way under the action of the error amplification signal in setting
It fixes time interior conducting；
One switch of series connection in each switching branches, after the error amplification signal is converted to digital signal by an analog-digital converter
The control terminal of the switch is connected to, to make different switch conductions when the error amplification signal changes.
2. according to claim 1 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Selecting unit includes a buffer, and the selected clock signal is connected by the buffer with the control circuit.
3. according to claim 1 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Clock division unit includes multiple cascade d type flip flops, and the QN ends of each d type flip flop connect next d type flip flop
Clock pulse input terminal, the QN ends of each d type flip flop also feed back to the signal input part of the same d type flip flop,
The clock pulse input terminal of one d type flip flop connects the reference clock source, and the QN ends of the last one d type flip flop are only
Feed back to the signal input part of the same d type flip flop；The Q ends of each d type flip flop be used for export it is divided after clock
Signal.
4. according to claim 3 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Clock division unit includes three cascade d type flip flops, respectively the first d type flip flop, the second d type flip flop and 3d flip-flop,
The selecting unit include first switch branch, second switch branch, the 3rd switching branches, the first of first d type flip flop
Output terminal exports the clock signal of the first setpoint frequency；First output terminal of second d type flip flop exports the second setpoint frequency
Clock signal；First output terminal of the 3d flip-flop exports the clock signal of the 3rd setpoint frequency；Amplify in error and believe
Conducting all the way under the action of number in the first switch branch, second switch branch, the 3rd switching branches, to the control electricity
Road provides the clock signal of setpoint frequency all the way.
5. according to claim 1 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Operating circuit includes：
One charge control branch is connected to an Input voltage terminal and one first and crosses between node；
One charge and discharge branch is connected to described first and crosses between node and an output voltage terminal；
One control of discharge branch is connected to described first and crosses between node and a ground terminal, and the energy-storage travelling wave tube is series at institute
State charge and discharge branch road；
For the operating circuit when charge mode, the switching device group controls the charge control branch and the charge and discharge branch
Road turns on, and the control of discharge branch is controlled to disconnect, and the electric current of the Input voltage terminal input is made to fill the energy-storage travelling wave tube
Electricity；
For the operating circuit when discharge mode, the switching device group controls the control of discharge branch and the charge and discharge branch
Road turns on, and the charge control branch is controlled to disconnect, and the energy-storage travelling wave tube is made to discharge the output voltage terminal.
6. according to claim 5 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Control circuit further includes,
One feedback network is connected between the output voltage terminal and the ground terminal, to generate the voltage feedback signal；
One current detection circuit, the controllable Input voltage terminal and described first that is parallel to crosses between node, to root
The current detection signal is generated according to pulse-modulated signal.
7. according to claim 6 realize warbled Switching Power Supply based on divided oscillator device, which is characterized in that described
Current detection circuit includes：
One detection resistance is series on the current detection circuit；
One detection compensating unit connects the both ends of the detection resistance, to detect the electric current for flowing through the detection resistance；
The detection control switch of one signal control break-make pulsed, is connected on the current detection circuit.
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| CN110121043B (en) * | 2019-06-10 | 2022-04-15 | 北海惠科光电技术有限公司 | Display power supply device and display system |
| CN110212894A (en) * | 2019-07-12 | 2019-09-06 | 深圳市泛海数据科技有限公司 | A kind of clock frequency switching circuit |
| CN115913120A (en) * | 2022-12-19 | 2023-04-04 | 南京微盟电子有限公司 | Automatic frequency conversion oscillator with narrow range near central frequency |
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