CN107404217A - Switching power source control circuit and method and Switching Power Supply - Google Patents
Switching power source control circuit and method and Switching Power Supply Download PDFInfo
- Publication number
- CN107404217A CN107404217A CN201710712428.2A CN201710712428A CN107404217A CN 107404217 A CN107404217 A CN 107404217A CN 201710712428 A CN201710712428 A CN 201710712428A CN 107404217 A CN107404217 A CN 107404217A
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- China
- Prior art keywords
- signal
- main switch
- switching power
- control circuit
- turn
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Classifications
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of switching power source control circuit and method and Switching Power Supply.Switching power source control circuit, including：Main switch control circuit, receives the first signal and secondary signal, and output characterizes the main switch control signal of main switch turn-on and turn-off；Auxiliary switch pipe control circuit, receive the signal for characterizing the main switch ON time, when the signal of the sign main switch ON time reaches conduction threshold, then auxiliary switch pipe turns off, when the signal of the sign main switch ON time is less than the conduction threshold, then the auxiliary switch pipe control signal for characterizing auxiliary switch pipe turn-on and turn-off is produced according to the main switch control signal.The present invention can further improve maximum duty cycle, so as to further improve the maximum of output voltage.
Description
Technical field
The present invention relates to electric and electronic technical field, in particular, is related to switching power source control circuit and method and opens
Powered-down source.
Background technology
The circuit structure type of the Switching Power Supply of prior art includes reduction voltage circuit (Buck circuits), booster circuit (Boost
Circuit), forward converter (Forward circuits), circuit of reversed excitation (Flyback circuits) etc., input voltage can be converted into needs
Output voltage with driving load.In actual applications, these circuits generally include a main switch and an auxiliary switch
Pipe.In the prior art, the turn-on and turn-off of main and auxiliary switching tube are driven generally by the mode of Synchronization Control, so as to reach
The purpose of pressure regulation.Described Synchronization Control refers to that the conducting of main and auxiliary switching tube and switch are opposite and synchronous.As shown in figure 1,
In the trailing edge trigger switch signalizing activity of clock signal, main switch conducting, the shut-off of auxiliary switch pipe, by error amplifier or
The output signal of comparator, which controls, to be caused, after elapsed time Ton, main switch shut-off, and the conducting of auxiliary switch pipe.In this process
In, the turn-on and turn-off of main switch and auxiliary switch pipe are opposite, and the change of turn-on and turn-off is synchronous.
In prior art is Synchronization Control, said process constantly increases with Ton, then the ON time of main switch by
Cumulative length, when the rising edge ratio error amplifier of pulse signal or the output signal of comparator first reach, now pulse letter
Number rising edge directly main switch is turned off, the conducting of auxiliary switch pipe, Ton reaches maximum, i.e. Ton (max).Opened due to auxiliary
Pipe is closed with minimum ON time, due to Synchronization Control, therefore main switch has corresponding minimum turn-off time, main switch
The minimum turn-off time must be turned off so that the maximum ON time Ton (max) of main switch is restricted.Such as Fig. 2 institutes
Show, rising edge of a pulse controls the shut-off of main switch, and the minimum ON time Bon (min) of auxiliary switch pipe controls main switch
Conducting, now main switch there is maximum ON time Ton (max), dutycycle reaches maximum, and output voltage reaches maximum
Value.In Synchronization Control, the maximum ON time of main switch is restricted, when can not now continue to increase the conducting of main switch
Between, dutycycle can not continue to increase so that the scope of output voltage is by a definite limitation.
The content of the invention
In view of this, the present invention proposes a kind of switching power source control circuit and method and Switching Power Supply, can further carry
The ON time of high main switch so that dutycycle can continue to increase, so as to further improve the maximum of output voltage.
The invention provides a kind of switching power source control circuit, including：
Main switch control circuit, receives the first signal and secondary signal, and output characterizes main switch turn-on and turn-off
Main switch control signal；
Auxiliary switch pipe control circuit, the signal for characterizing the main switch ON time is received, when the sign main switch
When the signal of pipe ON time reaches conduction threshold, then auxiliary switch pipe turns off, when the letter of the sign main switch ON time
When number being less than the conduction threshold, then produced according to the main switch control signal and characterize the auxiliary of auxiliary switch pipe turn-on and turn-off
Switch controlled signal.
Optionally, the auxiliary switch pipe control circuit includes comparison circuit, and the comparison circuit receives described in sign respectively
The signal of main switch ON time and the signal for characterizing conduction threshold, when the signal of the sign main switch ON time reaches
During to conduction threshold so that auxiliary switch pipe is off state, is characterized until the signal of the main switch ON time is less than
The signal of conduction threshold.
Optionally, described switching power source control circuit also includes main switch time detection circuit, receives the output
The main switch control signal of main switch turn-on and turn-off is characterized, exports the signal for characterizing main switch ON time.
Optionally, described conduction threshold refer to setting Synchronization Control in main switch maximum ON time.
Optionally, the auxiliary switch pipe control circuit also includes phase inverter and nor gate, and the comparison circuit receives respectively
Characterize the main switch ON time signal and characterize conduction threshold signal, the comparison circuit output end be connected to or
The first input end of NOT gate, the phase inverter receive the sign auxiliary switch pipe according to caused by the main switch control signal
The auxiliary switch pipe control signal of turn-on and turn-off, the output end of the phase inverter is connected to the second input of nor gate, described
The described auxiliary switch pipe control signal for characterizing the shut-off of auxiliary switch pipe or turn-on and turn-off of nor gate output.
Optionally, first signal is pulse signal, and the secondary signal is the defeated of error amplifier in Switching Power Supply
Go out signal.
A kind of Switching Power Supply control method, based on above-mentioned switching power source control circuit, including：
The signal for characterizing the main switch ON time and conduction threshold are compared,
When the signal of the sign main switch ON time is more than or equal to conduction threshold, then auxiliary switch pipe turns off；
When the signal of the sign main switch ON time is less than the conduction threshold, then according to the main switch
Control signal produces the auxiliary switch pipe control signal for characterizing auxiliary switch pipe turn-on and turn-off.
A kind of Switching Power Supply, including：Main switch, auxiliary switch pipe, a kind of switching power source control circuit of any of the above, it is described
The output end of the main switch control circuit of the described switching power source control circuit of the control terminal connection of main switch, it is described auxiliary to open
Close the output end of the auxiliary switch pipe control circuit of the switching power source control circuit described in the control terminal connection of pipe.
Compared with prior art, the technical scheme of the present invention has advantages below：Present invention utilization will characterize the master and open
The signal and conduction threshold for closing pipe ON time are compared, and are more than conduction threshold when characterizing the switching tube ON time signal
When so that auxiliary switch pipe turns off always, increases the ON time of main switch by reducing the ON time of auxiliary switch pipe, from
And make it that the dutycycle of prior art further increases, so as to further improve the maximum of output voltage, therefore the present invention can be with
Increase the range of regulation of regulating circuit.
Brief description of the drawings
Fig. 1 is the schematic diagram of the main and auxiliary switching tube turn-on and turn-off of prior art Synchronization Control；
The principle of main and auxiliary switching tube turn-on and turn-off when Fig. 2 is prior art Synchronization Control main switch ON time maximum
Figure；
The embodiment schematic diagram of Fig. 3 switching power source control circuits of the present invention；
A kind of example structure schematic diagram of Fig. 4 auxiliary switch pipe control circuits of the present invention；
When Fig. 5 main switches ON time is more than or equal to conduction threshold, the present invention controls main and auxiliary switching tube turn-on and turn-off
Schematic diagram；
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that accompanying drawing is adopted
Non- accurately ratio is used with more simplified form and, only to convenience, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Fig. 3 illustrates switching power source control circuit embodiment circuit structure of the present invention.Described switching power source control circuit
Including main switch control circuit, main switch ON time detection circuit, auxiliary switch pipe control circuit.
Described main switch control circuit receives the first signal and secondary signal, and output characterizes main switch conducting and closed
Disconnected T signal, and then control the turn-on and turn-off of main switch；The main switch ON time detection circuit receives the table
The control signal of main switch turn-on and turn-off, as T signal are levied, output characterizes main switch ON time Ton signal；It is described
One input of auxiliary switch pipe control circuit receives to characterize main switch ON time Ton signal, another input termination basis
The main switch control signal produces the auxiliary switch pipe control signal for characterizing auxiliary switch pipe turn-on and turn-off, is designated as B signal, B
Signal and T signal are synchronous and opposite.Described Switching Power Supply is Buck circuits, and Buck includes：First switch pipe M1 and second is opened
Close pipe M2, inductance L and electric capacity C.Described first switch pipe M1 drain electrode connects input voltage, described first switch pipe M1 source
Pole connects described second switch pipe M2 drain electrode, described second switch pipe M2 source ground.An inductance L1 termination first
Switching tube M1 and second switch pipe M2 common port, hot end of the inductance L1 other ends as output end.An electric capacity C termination
The hot end of output end, other end ground connection.The output end connection main switch M1 of main switch drive circuit grid,
The auxiliary switch tube drive circuit is connected to auxiliary switch pipe M2 grid.
When the signal of the sign main switch ON time Ton reaches conduction threshold, then auxiliary switch pipe turns off, and works as institute
State when characterizing main switch ON time Ton signal and being less than the conduction threshold, then according to the main switch control signal
The auxiliary switch pipe control signal for producing sign auxiliary switch pipe turn-on and turn-off is B signal.
In the present embodiment, first signal is pulse signal, and the secondary signal is that error is amplified in Switching Power Supply
The output signal of device, but its related signal for thering is identical to act on the first signal and secondary signal, the guarantor in the present invention
In the range of shield.Because described Switching Power Supply error amplifier is not the pith of the present invention, therefore do not given in figure
Go out.
As shown in figure 4, a kind of embodiment of auxiliary switch pipe control electric current is illustrated, described auxiliary switch pipe control circuit bag
The first input end for including comparison circuit U01, phase inverter and nor gate U02, the comparison circuit U01 receives described main switch
ON time Ton, the comparison circuit U01 the second input receive conduction threshold, the output end of the comparison circuit connects
Nor gate U02 first input end is connected to, the phase inverter, which receives to produce according to the main switch control signal, characterizes auxiliary open
The auxiliary switch pipe control signal for closing pipe turn-on and turn-off is B signal, and the output of the phase inverter is connected to the second of nor gate U02
Input, the described auxiliary switch management and control system letter for characterizing the shut-off of auxiliary switch pipe or turn-on and turn-off of the nor gate U02 outputs
Number.
The conduction threshold can be set as the maximum ON time of main switch, or leaves certain threshold value and arrives
The constant of the maximum ON time of main switch, or other other values that can characterize ON time restriction.This implementation
The conduction threshold of example is set as the maximum ON time Tmax of main switch, but other related conduction threshold settings are also at this
In the protection domain of invention.
In Fig. 4, the ON time Ton signals of the conduction threshold Tmax signals and the main switch are compared
Compared with, if Ton ＞ Tmax, comparison circuit U01 output logic highs 1, directly export logic low 0 after nor gate U02,
So that auxiliary switch pipe turns off；If Ton ＜ Tmax, comparison circuit U01 output logic lows 0, nor gate U02 follows auxiliary
Switch controlling signal is B signal, so as to control the turn-on and turn-off of auxiliary switch pipe.That is, during Ton ＞ Tmax, auxiliary switch pipe is always
Shut-off, as shown in Figure 5.When Ton ＜ Tmax, turn-on and turn-off and the main switch of auxiliary switch pipe be it is synchronous and opposite,
It is i.e. identical with Synchronization Control process, as shown in Figure 1 and Figure 2.
In prior art is Synchronization Control, the Continuity signal Ton of main switch is by error amplifier or comparator
Output signal control, i.e., error amplifier or comparator output signal control main switch shut-off；With Ton not
Disconnected increase, then the ON time of main switch gradually increases, until the rising edge ratio error amplifier or comparator of pulse signal
Output signal when first reaching, now the rising edge of pulse signal directly causes main switch to turn off, the conducting of auxiliary switch pipe, Ton
Reach maximum, i.e. Tmax.In Synchronization Control, due to Guan Youyi minimum ON time of auxiliary switch, i.e. main switch has most
Small turn-off time, main switch can just turn on after must turning off this minimum turn-off time, so that main switch
Maximum ON time is restricted.The present invention effectively avoids such case, and the ON time of main switch can be caused to reach
It may continue to increase after to maximum ON time Tmax.When the ON time Ton of the main switch detected is more than or equal to conducting
During threshold value Tmax, auxiliary switch pipe control circuit, which controls, causes auxiliary switch to turn off always, now the conducting of main switch and pass
It is disconnected to be controlled respectively by the trailing edge and rising edge of pulse, and the high level of pulse is generally much smaller than the turn-off time of auxiliary switch pipe,
Therefore after the ON time Ton of main switch reaches conduction threshold Tmax, it can continue to increase, further increase dutycycle.
In addition, example given here is the situation of Buck circuits, but the present invention is applied to arbitrarily include main and auxiliary switch
Pipe, and the control mode of main and auxiliary switching tube is the circuit of Synchronization Control in the circuit.
Although embodiment is separately illustrated and illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
Refer to another embodiment on the books.
Embodiments described above, the restriction to the technical scheme protection domain is not formed.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (8)
- A kind of 1. switching power source control circuit, it is characterised in that including：Main switch control circuit, receives the first signal and secondary signal, and the master that output characterizes main switch turn-on and turn-off opens Close pipe control signal；Auxiliary switch pipe control circuit, the signal for characterizing the main switch ON time is received, when the sign main switch is led When the signal of logical time reaches conduction threshold, then auxiliary switch pipe turns off, when the signal of the sign main switch ON time is small When the conduction threshold, then the auxiliary switch for characterizing auxiliary switch pipe turn-on and turn-off is produced according to the main switch control signal Pipe control signal.
- 2. switching power source control circuit according to claim 1, it is characterised in that：The auxiliary switch pipe control circuit includes Comparison circuit, the comparison circuit receive the signal for characterizing the main switch ON time and the letter for characterizing conduction threshold respectively Number, when the signal of the sign main switch ON time reaches conduction threshold so that auxiliary switch pipe is off state, directly Signal to the main switch ON time is less than the signal of sign conduction threshold.
- 3. switching power source control circuit according to claim 1 or 2, it is characterised in that：Described Switching Power Supply control electricity Road also includes main switch time detection circuit, receives the main switch control letter for characterizing main switch turn-on and turn-off Number, export the signal for characterizing main switch ON time.
- 4. switching power source control circuit according to claim 1 or 2, it is characterised in that：Described conduction threshold refers to set The maximum ON time of main switch in fixed Synchronization Control.
- 5. switching power source control circuit according to claim 2, it is characterised in that：The auxiliary switch pipe control circuit is also wrapped Phase inverter and nor gate are included, the comparison circuit receives the signal for characterizing the main switch ON time and characterized and turns on respectively The signal of threshold value, the comparison circuit output end are connected to the first input end of nor gate, and the phase inverter receives the basis The auxiliary switch pipe control signal of auxiliary switch pipe turn-on and turn-off, the phase inverter are characterized caused by the main switch control signal Output end be connected to the second input of nor gate, the described sign auxiliary switch pipe shut-off of the nor gate output or conducting and The auxiliary switch pipe control signal of shut-off.
- 6. switching power source control circuit according to claim 1, it is characterised in that：First signal is pulse signal, institute State output signal of the secondary signal for error amplifier in Switching Power Supply.
- 7. a kind of Switching Power Supply control method, based on the switching power source control circuit of claim 1-6 any one, including：The signal for characterizing the main switch ON time and conduction threshold are compared,When the signal of the sign main switch ON time is more than or equal to conduction threshold, then auxiliary switch pipe turns off；When the signal of the sign main switch ON time is less than the conduction threshold, then controlled according to the main switch Signal produces the auxiliary switch pipe control signal for characterizing auxiliary switch pipe turn-on and turn-off.
- 8. a kind of Switching Power Supply, including：Any one Switching Power Supply controls in main switch, auxiliary switch pipe and claim 1-6 Circuit, the output of the main switch control circuit of the switching power source control circuit described in the control terminal connection of the main switch End, the output end of the auxiliary switch pipe control circuit of the switching power source control circuit described in the control terminal connection of the auxiliary switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710712428.2A CN107404217B (en) | 2017-08-18 | 2017-08-18 | Switching power supply control circuit and method and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710712428.2A CN107404217B (en) | 2017-08-18 | 2017-08-18 | Switching power supply control circuit and method and switching power supply |
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| Publication Number | Publication Date |
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| CN107404217A true CN107404217A (en) | 2017-11-28 |
| CN107404217B CN107404217B (en) | 2023-06-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227147A (en) * | 2008-02-19 | 2008-07-23 | 北京中星微电子有限公司 | Direct current switch power supply control circuit |
| JP2009148157A (en) * | 2007-12-12 | 2009-07-02 | Micrel Inc | Voltage regulator for utilizing fixed on time with increased maximum duty cycle |
| JP2016032319A (en) * | 2014-07-28 | 2016-03-07 | ローム株式会社 | Switching power supply device |
| US20160149493A1 (en) * | 2014-11-21 | 2016-05-26 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit, control method and switch-type converter |
| CN105790581A (en) * | 2016-05-19 | 2016-07-20 | 杰华特微电子（杭州）有限公司 | Switching control circuit, switching circuit and constant switching-on time control method |
| CN207459981U (en) * | 2017-08-18 | 2018-06-05 | 杰华特微电子（杭州）有限公司 | Switching power source control circuit and Switching Power Supply |
-
2017
- 2017-08-18 CN CN201710712428.2A patent/CN107404217B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009148157A (en) * | 2007-12-12 | 2009-07-02 | Micrel Inc | Voltage regulator for utilizing fixed on time with increased maximum duty cycle |
| CN101227147A (en) * | 2008-02-19 | 2008-07-23 | 北京中星微电子有限公司 | Direct current switch power supply control circuit |
| JP2016032319A (en) * | 2014-07-28 | 2016-03-07 | ローム株式会社 | Switching power supply device |
| US20160149493A1 (en) * | 2014-11-21 | 2016-05-26 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit, control method and switch-type converter |
| CN105790581A (en) * | 2016-05-19 | 2016-07-20 | 杰华特微电子（杭州）有限公司 | Switching control circuit, switching circuit and constant switching-on time control method |
| CN207459981U (en) * | 2017-08-18 | 2018-06-05 | 杰华特微电子（杭州）有限公司 | Switching power source control circuit and Switching Power Supply |
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| Publication number | Publication date |
|---|---|
| CN107404217B (en) | 2023-06-23 |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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