CN201656775U - Switching power supply monocyclic fixed-frequency hysteresis-loop control device - Google Patents
Switching power supply monocyclic fixed-frequency hysteresis-loop control device Download PDFInfo
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- CN201656775U CN201656775U CN2010201423551U CN201020142355U CN201656775U CN 201656775 U CN201656775 U CN 201656775U CN 2010201423551 U CN2010201423551 U CN 2010201423551U CN 201020142355 U CN201020142355 U CN 201020142355U CN 201656775 U CN201656775 U CN 201656775U
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Abstract
The utility model discloses a switching power supply monocyclic fixed-frequency hysteresis-loop control device, which is used for controlling the peak value or the valley value of output voltage ripple of a convertor in each switch cycle. When in peak value controlling, at the starting time t0 of one switch cycle, a switch tube is conduced, and the output voltage Vo of a switch convertor rises; when the Vo rises to a reference voltage Vref, the switch tube continuously keeps a connecting state; when the Vo rises to a Vref + VE, the switch tube is disconnected, and the Vo drops; later, at the time t0+T, the switch tube is connected again, and the convertor enters the next switch cycle to work. The converter switch frequency fixing is adopted, so the transient performance is good, and circuit controlling is simple. The control device only needs to detect the output voltage of the convertor and does not need a compensation link, so the control device is suitable for convertors with various topological structures.
Description
Technical field
The utility model relates to the control device of Switching Power Supply.
Background technology
In recent years, fast development along with electronic technology and information technology, Switching Power Supply becomes the focus of application of electric and electronic technical field engineering and academic research, and microprocessor, communication apparatus, industrial control equipment, medicine equipment, motor vehicle etc. all extensively adopt the high-performance direct current Switching Power Supply as its power supply unit.
Switch power supply system generally is made up of power main circuit and control circuit.Power main circuit (being switch converters) mainly comprises switching tube, current rectifying and wave filtering circuit, isolating transformer etc.; The topological classification of switch converters has Buck, Boost, Flyback, Full-Bridge etc.Control circuit (being controller) is used for the operating state of detection power main circuit, and produces control wave control switch pipe, and it is stable to guarantee output to regulate the electric weight that passes to load.The structure of controller and operation principle are determined by the control method that power-supply system adopted.At present, Switching Converter Topologies partly reaches its maturity through years development, and control method then becomes the key that influences power source performance with the control circuit relevant with control method.
Power consumption equipment such as high-performance microprocessor, very lagre scale integrated circuit (VLSIC) has proposed more and more higher requirement to the transient response ability of Switching Power Supply, the control technology that voltage-type, current mode etc. are traditional is owing to exist the compensating delay link in the control loop, and mapping is difficult to further raising.The ring control that stagnates is a kind of with the converter output voltage V
oBe limited in reference voltage V
RefBe the power control method in the stagnant ring at center, its control principle is: work as output voltage V
oInscribe at a time and drop to the ring lower limit V that stagnates
L(V
L＜V
Ref) time, the conducting of control switch pipe, induction charging, output voltage rises; Work as output voltage V
oRise to the ring upper limit V that stagnates
H(V
H＞V
Ref) time, switching tube turn-offs, inductive discharge, and output voltage descends, and this state will remain to output voltage and drop to the ring lower limit that stagnates once more, begin next switch periods subsequently.Do not have delay link in the stagnant loop control circuit, therefore have very fast transient response speed.But the ring control that stagnates belongs to method for controlling frequency conversion, and the operating state of converter can influence switching frequency, and this brings difficulty can for aspects such as the design of converter filter circuit, EMI inhibition.
For this reason, we have designed new control method.
The single-loop constant-frequency hysteresis control method thereof of Switching Power Supply, realize the stagnant ring control of single-loop constant-frequency by the control device that converter TD and controller are formed, controller comprises voltage detecting circuit VCC, comparator AC, clock signal generator CPG, trigger FF, drive circuit DR; Its control method comprises:
At the initial t of some switch periods
0Constantly, switching tube conducting, switch converters output voltage V
oRise; Work as V
oRise to reference voltage V
RefThe time, switching tube continues to keep opening state; Work as V
oRise to V
Ref+ V
EThe time (V
EBe default fixed voltage value, V
E＞0), switching tube turn-offs, V
oDescend thereupon; Subsequently, at t
0+ T opens switching tube constantly once more, and converter enters next switch periods and carries out work.
Obviously, in the control method recited above (we are referred to as first kind of concrete practice for the narration facility), the peak value of controller control change device output voltage ripple.Symmetry is with it, and when the valley of controller control change device output voltage ripple, the method for employing and the above method have reciprocity logical order, and its concrete control method (being referred to as second kind of concrete practice) can be expressed as:
At the initial t of some switch periods
0Constantly, switching tube turn-offs, the switch converters output voltage V
oDescend; Work as V
oDrop to reference voltage V
RefThe time, switching tube continues to keep off state; Work as V
oDrop to V
Ref-V
EThe time, switching tube conducting, V
oRise thereupon; Subsequently, at t
0+ T constantly, on-off switching tube once more, converter enters next switch periods and carries out work.
As above first kind and second kind of concrete practice realize control by the peak value or the valley of control change device output voltage ripple in each switch periods respectively.
The utility model content
The purpose of this utility model is to encircle control device for above control method provides a kind of switch power supply single-loop constant-frequency to stagnate, make it to have the converter switches fixed-frequency, mapping is good, the advantage that control circuit only needs to detect the converter output voltage and do not need compensation tache is applicable to the converter of various topological structures.
For realizing the utility model purpose, the technical scheme that is adopted is:
A kind of switch power supply single-loop constant-frequency stagnates and encircles control device, is made up of converter TD and controller, and controller comprises voltage detecting circuit VCC, comparator AC, clock signal generator CPG, trigger FF, drive circuit DR.Voltage detecting circuit VCC, comparator AC, trigger FF, drive circuit DR link to each other successively; Clock signal generator CPG links to each other with trigger FF.
Compared with prior art, the beneficial effects of the utility model are:
One, realizes control by the peak value or the valley of control output voltage in each switch periods to converter.Compare with existing switch converters hysteresis control method thereof, the duration in the converter switches cycle that employing the utility model is controlled is default fixed value, and operating frequency is not subjected to the influence of converter operating state.Therefore, this device can effectively solve the stagnate problem of aspects such as filter circuit design that the ring control technology exists and EMI of tradition.
Two,, the information of output voltage and inductive current can be directly used in adjusting, and not comprise delay link in the control system duty ratio with the feedback quantity of output voltage ripple as control system.Therefore, this device can be made adjusting rapidly for the disturbance of converter input or load end appearance, has good transient response ability.
Three, simple and easy to do, adopt very simple analog or digital circuit this device can be applied to the engineering field; Do not have in the control loop traditional electrical die mould or current-mode control required compensating network (generally constituting) by operational amplifier and peripheral circuit, so controller is easy to integratedly, with low cost, and do not need complicated design process when using.
The course of work and the principle of this device are: in the initial moment of each switch periods, clock signal generator sends a clock pulse V
CP, trigger set output high level is by the conducting of drive circuit control switch pipe, converter output voltage V
oRise; Voltage detecting circuit detects output voltage V
o, and with V
oVoltage signal exports comparator to; Comparator is with V
oWith predeterminated voltage value V
Ref+ V
ERelatively and export trigger to, work as V
oLess than V
Ref+ V
EThe time, the trigger hold mode is constant, works as V
oRise to V
Ref+ V
EThe time, the comparator output signal saltus step, and make the trigger reset output low level, switching tube turn-offs, the converter output voltage V
oDescend thereupon; The trigger output signal remains low level until next clock pulse V
CPArrive, controller repeats the above-mentioned course of work subsequently, and converter enters next switch periods and carries out work.
As seen, employing can realize above-mentioned first kind of concrete practice easily and reliably with upper controller.The control device of this structure can also be used for second kind of above-mentioned concrete practice through simple change.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Description of drawings
Fig. 1 is the signal flow graph of the utility model embodiment one.
Fig. 2 is the circuit structure diagram of the utility model embodiment one.
Fig. 3 a is the utility model embodiment one a certain period clock pulse signal V under limit
CPThe time-domain-simulation oscillogram.
Fig. 3 b is and the same period output voltage V of Fig. 3 a
oThe time-domain-simulation oscillogram.
Fig. 3 c is and Fig. 3 a control wave V of same period
PThe time-domain-simulation oscillogram.
Fig. 3 simulated conditions is as follows: input voltage V
In=15V, output voltage fiducial value V
Ref=8V, inductance L=80 μ H, capacitor C=470 μ F, load resistance R=16 Ω, switch periods T=50 μ s, predeterminated voltage V
E=30mV.
Fig. 4 a converter load current I that is embodiment one when load changing (load current at 30ms constantly by 0.08A transition to 1A)
oSimulation waveform figure.
Fig. 4 b is and the same period output voltage V of Fig. 4 a
oThe time-domain-simulation oscillogram.
Fig. 4 c is and Fig. 4 a inductive current I of same period
LThe time-domain-simulation oscillogram.
Fig. 5 a converter output voltage V that is embodiment one when load changing (load current at 30ms constantly by 0.08A transition to 1A)
oSimulation waveform figure.
Fig. 5 b be existing voltage type PWM control change device when same load variations, output voltage V
oSimulation waveform figure.
Fig. 6 is the circuit structure block diagram of the utility model embodiment two.
Fig. 7 is the circuit structure block diagram of the utility model embodiment three.
Embodiment
Embodiment one
Fig. 1 illustrates a kind of embodiment of the present utility model, the single-loop constant-frequency hysteresis control method thereof of Switching Power Supply, and its concrete practice is:
In the initial moment of each switch periods, clock signal generator CPG sends a clock pulse V
CP, trigger FF set output high level is by the switching tube S conducting among the drive circuit DR control change device TD, converter output voltage V
oRise; Voltage detecting circuit VCC detects output voltage V
o, and with V
oVoltage signal exports comparator AC to; Comparator AC is with V
oWith predeterminated voltage value V
Ref+ V
ERelatively and export trigger FF to, work as V
oLess than V
Ref+ V
EThe time, trigger FF hold mode is constant, works as V
oRise to V
Ref+ V
EThe time, the saltus step of comparator AC output signal, and make the trigger FF output low level that resets, switching tube S turn-offs, the converter output voltage V
oDescend thereupon; The trigger output signal remains low level until next clock pulse V
CPArrive, controller repeats the above-mentioned course of work subsequently, and converter TD enters next switch periods and carries out work.
This example is corresponding to first kind of concrete practice of above-mentioned control method, the peak value of controller control change device output voltage ripple.
This example adopts following device, and above-mentioned control method is realized quickly and easily.Fig. 2 illustrates, and the Switching Power Supply control device that this is routine is made up of converter TD and controller, and controller comprises voltage detecting circuit VCC, comparator AC, clock signal generator CPG, trigger FF, drive circuit DR.Voltage detecting circuit VCC, comparator AC, trigger FF, drive circuit DR link to each other successively; Clock signal generator CPG links to each other with trigger FF.
Specifically consisting of of this routine middle controller: voltage detecting circuit VCC detects converter output terminal voltage; The output of voltage detecting circuit VCC links to each other with the positive ends of comparator AC; Comparator AC output is held link to each other (the trigger FF in this example is a rest-set flip-flop) with the R of trigger FF; Clock signal generator CPG output links to each other with the S end of trigger FF; The output Q of trigger FF links to each other with drive circuit DR.
Its course of work of the device of this example and principle are:
Before certain switch periods began, the Q of trigger FF end was output as low level, and the switching tube S among the converter TD is in off state; Controller enters this switch periods and carries out work subsequently, and clock signal generator CPG sends a high level burst pulse as clock signal, and this clock pulse is with trigger FF set, and promptly trigger FF triggers upset, Q end output high level; The high level signal of Q end output is through overdrive circuit DR control switch pipe S conducting, converter output voltage V
oRise thereupon; Voltage detecting circuit VCC detects output voltage V
o, and with V
oVoltage signal exports the positive ends of comparator AC to; Comparator AC is with V
oWith predeterminated voltage value V
Ref+ V
ERelatively and export the R end of trigger FF to; In the incipient stage of this switch periods, output voltage V
oBe lower than V
Ref+ V
E, comparator AC output low level, trigger FF keeps output state constant, and switching tube S continues conducting; Work as output voltage V
oRise to V
Ref+ V
EThe time, comparator AC output signal is a high level by low transition; The high level signal of comparator AC output resets trigger FF, and promptly trigger FF triggers upset, and Q holds output low level; The low level signal of Q end output turn-offs the converter output voltage V through overdrive circuit DR control switch pipe S
oDescend thereupon; The Q end output signal of trigger FF remains low level arrives until next clock pulse, and controller repeats the above-mentioned course of work subsequently, and converter TD enters next switch periods and carries out work.
This routine converter TD is the Buck converter.
With Matlab/Simulink software this routine method is carried out the time-domain-simulation analysis, the result is as follows.
The work wave of converter under the nominal operation state of the control device that Fig. 3 obtains for emulation.Fig. 3 a, Fig. 3 b and Fig. 3 c are respectively clock pulse signal V
CP, output voltage V
oWith control signal V
PAs seen, this moment, converter worked in stable state, and the control signal frequency is decided by the clock pulse signal fixed.
The transient working waveform of Fig. 4 converter that is embodiment one when load changing (load current at 30ms constantly by 0.08A transition to 1A).Fig. 4 a, Fig. 4 b and Fig. 4 c are respectively load current I
o, output voltage V
oWith inductive current I
LAs seen, converter can be made response rapidly behind load changing, can return to stable state again through after about 5 switch periods, and output voltage falls not obvious.In addition, changing does not appear in the converter switches frequency after the load variations.So the utility model device is the control frequently surely of a kind of Switching Power Supply.
The simulation waveform figure of Fig. 5 a converter output voltage that is embodiment one when load changing (load current at 30ms constantly by 0.08A transition to 1A).Fig. 6 b be existing voltage type PWM control change device when same load variations, the simulation waveform figure of output voltage.As seen, existing voltage type PWM control change device could recover stable state through behind about 2ms after disturbance occurs, and the output voltage amount of falling is near 200mV; And under the same condition, when adopting the utility model to control, Switching Power Supply can be at 0.5ms with interior new stable state, the about 50mV of the output voltage amount of falling of entering.So transient response ability of the present utility model is better than traditional PWM control.
Embodiment two
Fig. 6 illustrates, and this example is basic identical with embodiment one, and difference is: embodiment two adopts second kind of concrete practice of above-mentioned control method, the valley of controller control change device output voltage ripple.Therefore compare with embodiment one, the controller architecture among the embodiment two has following difference: the output of voltage detecting circuit VCC links to each other with the negative polarity end of comparator AC; Comparator AC output links to each other with the S end of trigger FF; Clock signal generator CPG output links to each other with the R end of trigger FF.
The converter TD of the Switching Power Supply of this example control is the Boost converter, as shown in Figure 6.
Embodiment three
Fig. 7 illustrates, and this example is basic identical with embodiment one, and difference is: the converter TD of the Switching Power Supply of this example control is a single-ended forward converter.
The utility model is a kind of audio-frequency control device of deciding, and the switching frequency of Switching Power Supply is determined by external clock pulse.Control device can be realized with analogue device or digital device easily; The Switching Power Supply that converter in can be used for above embodiment is formed, also can be used for multiple power circuit such as Buck-Boost converter, Cuk converter, BIFRED converter, anti exciting converter, half-bridge converter, full-bridge converter and form Switching Power Supply.
Claims (3)
1. a switch power supply single-loop constant-frequency stagnates and encircles control device, is made up of converter TD and controller, and it is characterized in that: controller comprises voltage detecting circuit VCC, comparator AC, clock signal generator CPG, trigger FF, drive circuit DR; Voltage detecting circuit VCC, comparator AC, trigger FF, drive circuit DR link to each other successively; Clock signal generator CPG links to each other with trigger FF.
2. the switch power supply single-loop constant-frequency according to claim 1 ring control device that stagnates is characterized in that: the output that is used to detect the voltage detecting circuit VCC of converter output terminal voltage links to each other with the positive ends of comparator AC; Comparator AC output links to each other with the R end of trigger FF; Clock signal generator CPG output links to each other with the S end of trigger FF; The output Q of trigger FF links to each other with drive circuit DR.
3. the switch power supply single-loop constant-frequency according to claim 1 ring control device that stagnates is characterized in that: the output that is used to detect the voltage detecting circuit VCC of converter output terminal voltage links to each other with the negative polarity end of comparator AC; Comparator AC output links to each other with the S end of trigger FF; Clock signal generator CPG output links to each other with the R end of trigger FF; The output Q of trigger FF links to each other with drive circuit DR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201423551U CN201656775U (en) | 2010-03-26 | 2010-03-26 | Switching power supply monocyclic fixed-frequency hysteresis-loop control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201423551U CN201656775U (en) | 2010-03-26 | 2010-03-26 | Switching power supply monocyclic fixed-frequency hysteresis-loop control device |
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| Publication Number | Publication Date |
|---|---|
| CN201656775U true CN201656775U (en) | 2010-11-24 |
Family
ID=43122005
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201423551U Expired - Fee Related CN201656775U (en) | 2010-03-26 | 2010-03-26 | Switching power supply monocyclic fixed-frequency hysteresis-loop control device |
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| Country | Link |
|---|---|
| CN (1) | CN201656775U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100353A (en) * | 2016-08-25 | 2016-11-09 | 西南交通大学 | DC DC changer V2hysteresis control method thereof and control device thereof |
| CN109088541A (en) * | 2018-09-29 | 2018-12-25 | 天津大学 | A kind of switched-mode power supply of the quasi- fixed-frequency control of voltage hysteresis |
-
2010
- 2010-03-26 CN CN2010201423551U patent/CN201656775U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100353A (en) * | 2016-08-25 | 2016-11-09 | 西南交通大学 | DC DC changer V2hysteresis control method thereof and control device thereof |
| CN106100353B (en) * | 2016-08-25 | 2018-09-11 | 西南交通大学 | DC-DC converter V2Hysteresis control method thereof and its control device |
| CN109088541A (en) * | 2018-09-29 | 2018-12-25 | 天津大学 | A kind of switched-mode power supply of the quasi- fixed-frequency control of voltage hysteresis |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20130326 |