CN209313721U - A kind of start-up circuit and electronic equipment of Switching Power Supply - Google Patents
A kind of start-up circuit and electronic equipment of Switching Power Supply Download PDFInfo
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- CN209313721U CN209313721U CN201920211050.2U CN201920211050U CN209313721U CN 209313721 U CN209313721 U CN 209313721U CN 201920211050 U CN201920211050 U CN 201920211050U CN 209313721 U CN209313721 U CN 209313721U
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- 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 utility model discloses a kind of start-up circuit of Switching Power Supply and electronic equipments, comprising: resonant transformation module, filter module, protective module and the first power module；By the way that resonant transformation module to be connect with filter module, filter module connects the first end of protective module, and the second end of protective module connects the first power module；When the voltage value at filter module both ends is less than the first power module voltage value, protective module conducting, the first power module is charged by protective module to filter module, to reduce the electric current that resonant transformation module flows into filter module.It can be seen that; technical solution provided in this embodiment is by increasing protective module; when so that protective module being connected; first power module is charged by protective module to filter module; reduce the electric current that resonant transformation module flows into filter module; solves the prior art during startup, it is difficult to realize that starting can realize the problem of no-voltage opens switching tube every time.
Description
Technical field
The utility model embodiment be related to power supply control technology field more particularly to a kind of Switching Power Supply start-up circuit and
Electronic equipment.
Background technique
It is higher and higher to the performance requirement of Switching Power Supply with the fast development of electronic device technology, need eliminate or
Reduce switching loss, to improve the reliability of Switching Power Supply.Wherein, the resonance electricity with Inductivity-Inductivity-capacitor (LLC) structure
Road (i.e. LLC circuit) can adjust output voltage, Simultaneous Switching frequency in the case where input voltage and load wide variation
Change comparatively small, is widely used in it among various Switching Power Supplies.
In actual treatment, LLC circuit usually forms resonant network by resonant inductance, resonant capacitance and transformer, passes through
Frequency conversion achievees the purpose that pressure stabilizing.Specifically, can be made by control Signal-controlled switch pipe conducting in LLC circuit start
Input voltage 390V can be by the switching tube, resonant inductance, primary winding after, give resonant capacitance charging.Due to
There is electric current to flow through primary winding, then transformer secondary output winding, which generates induced electromotive force, makes rectifier diode conducting can be to filter
Wave capacitor charging causes the electricity to charge to resonant capacitance to reduce, and being difficult to realize start every time during startup can realize
No-voltage opens the problem of switching tube.
Utility model content
In view of this, the present invention provides a kind of start-up circuit of Switching Power Supply and electronic equipments, to solve existing skill
Art is during startup, it is difficult to realize that starting can realize the problem of no-voltage opens switching tube every time.
In a first aspect, the utility model embodiment provides a kind of start-up circuit of Switching Power Supply, comprising: resonant transformation mould
Block, filter module, protective module and the first power module；
The resonant transformation module is connect with the filter module, and the filter module connects the first of the protective module
The second end at end, the protective module connects first power module；
When the voltage value at the filter module both ends is less than the first power module voltage value, the protection mould
Block conducting, first power module is charged by the protective module to the filter module, to reduce the resonant transformation
Module flows into the electric current of the filter module.
Further, when the voltage value at the filter module both ends is more than or equal to the first power module voltage value
When, the protective module shutdown.
Further, the protective module includes: first diode；The anode connection described first of the first diode
The cathode of power module, the first diode connects the filter module.
Further, the resonant transformation module includes: square wave generating unit, resonant element and rectification unit,
The first end of the square wave generating unit connects the first end of the resonant element, and the of the square wave generating unit
Two ends connect the second end of the resonant element；
The third end of the resonant element connects the rectification unit first end；4th end of the resonant element connects institute
State the second end of rectification unit；
The third end of the rectification unit connects the filter module.
Further, the square wave generating unit includes the first power tube and the second power tube；
The first end of first power tube connects second power supply module, and the second end of first power tube is separately connected
First end, the first end of the resonant element of second power tube；
The second end of second power tube connects the second end of the resonant element.
Further, the resonant element includes series resonance inductor, parallel resonant inductor, series resonant capacitance and first
Transformer；
The first end of the series resonance inductor connects the first end of the square wave generating unit, the series resonance inductor
Second end be separately connected the first end of the first primary winding, the first end of the parallel resonant inductor；
The first end of the series resonant capacitance connects the second end of the square wave generating unit, the series resonant capacitance
Second end be separately connected the second end of the first primary winding, the second end of the parallel resonant inductor；
The first end of the first transformer secondary output winding connects the first end of the rectification unit；First transformer
The second end of secondary windings connects the second end of the rectification unit.
Further, the parallel resonant inductor is the magnetizing inductance of the first transformer.
Further, the rectification unit includes the second diode and third diode；
The anode of second diode connects the first end of the first transformer secondary output winding；Second diode
Cathode connect the filter module.
The anode of the third diode connects the second end of the first transformer secondary output winding；The third diode
Cathode connect the filter module.
Further, the start-up circuit of the Switching Power Supply, further includes: drive module；
Wherein, the first end of the drive module connects the third end of the square wave generating unit；The drive module
Second end connects the 4th end of the square wave generating unit.
Second aspect, the utility model embodiment additionally provide a kind of electronic equipment, and the electronic equipment includes as above-mentioned
The start-up circuit of Switching Power Supply described in first aspect.
The start-up circuit and electronic equipment of the Switching Power Supply provided in above-described embodiment, comprising: resonant transformation module, filtering
Module, protective module and the first power module；By the way that resonant transformation module to be connect with filter module, filter module connection is protected
The first end of module is protected, the second end of protective module connects the first power module；When the voltage value at filter module both ends is less than
When one power module voltage value, protective module conducting, the first power module is charged by protective module to filter module, with
Reduce the electric current that resonant transformation module flows into filter module.As it can be seen that technical solution provided in this embodiment is by increasing protection
Module, when so that protective module being connected, the first power module is charged by protective module to filter module, reduces resonant transformation
Module flows into the electric current of filter module, solves the prior art during startup, it is difficult to realize that starting can be realized every time
No-voltage opens the problem of switching tube.
Detailed description of the invention
Fig. 1 is the functional block diagram of the start-up circuit of one of the utility model embodiment Switching Power Supply；
Fig. 2 is the functional block diagram of the start-up circuit of one of the utility model alternative embodiment Switching Power Supply；
Fig. 3 is the structural schematic diagram of the start-up circuit of one of the utility model alternative embodiment Switching Power Supply.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 is the functional block diagram of the start-up circuit of one of the utility model embodiment Switching Power Supply；The present embodiment can
The case where suitable for soft start power-supply device, the start-up circuit of the Switching Power Supply is arranged in the control circuit of power-supply device.
Specifically, as shown in Figure 1, the start-up circuit of Switching Power Supply provided in this embodiment mainly includes following module: humorous
Shake conversion module 110, filter module 120, protective module 130 and the first power module 140；The resonant transformation module 110
It is connect with the filter module 120, the filter module 120 connects the first end of the protective module 130, the protective module
130 second end connects first power module 140.
It is described when the voltage value at 130 both ends of filter module is less than 140 voltage value of the first power module
Protective module conducting, first power module 140 is charged by the protective module 130 to the filter module 120, to subtract
Few resonant transformation module 110 flows into the electric current of the filter module 120.
In the present embodiment, the effect of protective module 130 is, when the voltage value at 120 both ends of filter module is less than institute
When stating the first 140 voltage value of power module, so that first power module 140 gives institute by the protective module 130
State the charging of filter module 120.The voltage value at 120 both ends of filter module can be made to maintain in a higher range in this way,
Avoiding transformer secondary output winding from generating induced electromotive force is connected rectifier diode, and then avoids charging to filter module 120, from
And can be avoided the situation that transformer charges to filter module 120 and leads to the electricity reduction of resonant capacitance charging, increase resonance
The electricity of capacitor charging.
Further, the resonant transformation module in the embodiment of the present invention can be real using the resonance circuit with LLC structure
It is existing.Wherein, LLC structure is performance a kind of topological structure more outstanding in all soft start topological structures, and can will have LLC
The resonant transformation module of structure is known as LLC conversion module.When LLC conversion module main function is Switching Power Supply starting, it can make
The output voltage of Switching Power Supply slowly rises, and promotes power-supply system power density.LLC conversion module has following advantages: originally
When grade switch tube zero voltage switch is opened, the shutdown of secondary commutation diode Zero Current Switch, circuit structure is simple, transfer efficiency
It is high.It should be noted that there are many topological structures for LLC conversion module in practical study.It can select to close according to the actual situation
The topological structure of suitable LLC conversion module.Such as: in the case where needing to export wide-voltage range, half-bridge structure can be selected
LLC converter；For another example: in the case where needing to drag high power load, the LLC converter of full bridge structure can be selected.It needs
To be illustrated, the present embodiment is only illustrated the topological structure of LLC conversion module, and non-limiting.
In the present embodiment, the first power module 140 refers to the module that the filter module 120 can be made to realize charging.
In the present embodiment, the first power module 140 is preferably DC power supplier, can select suitable direct current according to the actual situation
Power supply.Such as: dry cell, battery, dc generator etc..Further, described first power module, 140 output voltage values etc.
In the output voltage values of start-up circuit.
In the present embodiment, protective module 130 is less than first electricity in the voltage value when 120 both ends of filter module
When 140 voltage value of source module, the protective module conducting, first power module 140 passes through the protective module 130
It charges to the filter module 120, when the voltage value at filtering 120 both ends of mould is greater than or equal to first power module
When 140 voltage value, the protective module 130 is turned off, and the resonant transformation module charges to the filter module 120, is opened
The start-up circuit in powered-down source enters normal operating conditions, and the first power module 140 no longer charges to the filter module 120, i.e.,
When protective module 130 turns off, the normal work of resonant transformation module 110 is not influenced.
The start-up circuit of the Switching Power Supply provided in the present embodiment, comprising: resonant transformation module, filter module, protection mould
Block and the first power module；By the way that resonant transformation module to be connect with filter module, filter module connects the of protective module
The second end of one end, protective module connects the first power module；When the voltage value at filter module both ends is less than the first power module
When voltage value, protective module conducting, the first power module is charged by protective module to filter module, to reduce resonance change
Mold changing block flows into the electric current of filter module.As it can be seen that technical solution provided in this embodiment, which passes through, increases protective module, so that protecting
When protecting module conducting, the first power module is charged by protective module to filter module, is reduced resonant transformation module and is flowed into
The electric current of filter module solves the prior art during startup, it is difficult to realize that starting can realize that no-voltage is open-minded every time
The problem of switching tube.
Further, Fig. 2 is the principle frame of the start-up circuit of one of the utility model alternative embodiment Switching Power Supply
Figure；As shown in Fig. 2, the protective module 130 includes: first diode D1；Described in the anode connection of the first diode D1
The cathode of first power module 140, the first diode D1 connects the filter module 130.
In the present embodiment, protective module 130 includes first diode D1, is the application forward voltage that diode is utilized
When be connected, the working principle ended when applying backward voltage.When the voltage value at 120 both ends of filter module is less than described first
When 140 voltage value of power module, i.e., the described first diode D1 bears forward voltage, and first diode D1 conducting is described
First power module 140 is charged by first diode D1 to the filter module 120.When the electricity at filtering 120 both ends of mould
When pressure value is greater than or equal to 140 voltage value of the first power module, i.e., the described first diode D1 bears backward voltage,
First diode D1 cut-off, the first power module 140 no longer charge to the filter module 120, and the resonant transformation module is given
The filter module 120 charges, and the start-up circuit of Switching Power Supply enters normal operating conditions, and the first diode D1 bears anti-
To after voltage cut-off, the normal work of resonant transformation module 110 is not influenced.
Further, in the present embodiment, the filter module 120 includes first capacitor C1, the first capacitor C1's
First end connects the cathode of the first diode D1, the first end ground connection of the second capacitor C1.Further, described
Filter module 120 can be set according to the actual situation, such as: it can be the parallel connection of multiple capacitors；For another example: can be multiple
The series connection of capacitor.It should be noted that the present embodiment is only illustrated filter module 120, and it is non-limiting.
Further, as shown in Fig. 2, the resonant transformation module 110 includes: square wave generating unit 111, resonant element
112 and rectification unit 113, the first end of the square wave generating unit 111 connects the first end of the resonant element 112, described
The second end of square wave generating unit 111 connects the second end of the resonant element 112；The third end of the resonant element 112 connects
Connect 113 first end of rectification unit；4th end of the resonant element 112 connects the second end of the rectification unit 113；Institute
The third end for stating rectification unit 113 connects the filter module 130.
It should be noted that the third end connection second power supply module of square wave generating unit 111 is (in figure in the present embodiment
It is not shown), second power supply module is used to provide DC power supply for resonant transformation module 110.Further, square wave generating unit
111 for being converted to square-wave signal for direct current according to control signal.Resonant element 112 is used to be input to resonance in square-wave signal
After unit 112, current waveform and voltage waveform generate phase difference, and output AC voltage signal.Output unit 113 is used for friendship
Stream voltage signal carries out rectification processing, exports d. c. voltage signal to filter module 120, filter module 120 will export direct current
After pressure signal is filtered, output is to load, so that load works normally.
It should be noted that second power supply module can be rectification circuit, D.C. regulated power supply or dry cell, electric power storage
Pond, dc generator etc. are not defined the form of second power supply module and type in the present embodiment.Square wave generating unit
111 be full-bridge square-wave generator or half-bridge square-wave generator, it should be noted that not square wave generator in the present embodiment
Form and type are defined.
Fig. 3 is the structural schematic diagram of the start-up circuit of one of the utility model alternative embodiment Switching Power Supply.Such as Fig. 3
Shown, the square wave generating unit 111 includes the first power tube Q1 and the second power tube Q2；The first of the first power tube Q1
End connection second power supply module 150, the second end of the first power tube Q1 are separately connected the first of the second power tube Q2
It holds, the first end of the resonant element 112；The second end of the second power tube Q2 connects the second of the resonant element 112
End.
It should be noted that square wave generating unit 111 is preferably half-bridge square-wave generator in the present embodiment, actually answering
In, suitable square wave generating unit can be designed according to the working environment and power demand of circuit.Not other side in the present embodiment
The connection relationship and type of wave generating unit are defined.
Preferably, power tube is preferably field-effect tube, the first end of power tube be the drain electrode of field-effect tube, power tube the
Two ends are the source electrode of field-effect tube.It should be noted that not being defined to the type of power tube, Ke Yigen in the present embodiment
Suitable transistor is designed according to the working environment and power demand of circuit.
Further, the resonant element 112 includes series resonance inductor L1, parallel resonant inductor L2, series resonance electricity
Hold C2 and the first transformer T1；The first end of the series resonance inductor L1 connects the first end of the square wave generating unit 111,
The second end of the i.e. described first power tube Q1, the second end of the series resonance inductor L2 are separately connected the first transformer T1
The first end of the first end of armature winding, the parallel resonant inductor L2；The first end of the series resonant capacitance C2 connects institute
State the second end of square wave generating unit 111, i.e., the second end of the described second power tube Q2, the second of the series resonant capacitance C2
End is separately connected second end, the second end of the parallel resonant inductor L2 of the first transformer T1 armature winding；Described
The first end of one transformer T1 secondary windings connects the first end of the rectification unit 113；Described first transformer T, 1 grade around
The second end of group connects the second end of the rectification unit 113.
It should be noted that the first transformer T1 is preferably high frequency ferrite transformer, specifically, the parallel resonance is electric
Sense is the magnetizing inductance of the first transformer.
Further, the rectification unit 113 includes the second diode D2 and third diode D3；Second diode
The anode of D2 connects the first end of the first transformer T1 secondary windings；The cathode of the second diode D2 connects the filter
Wave module 130, i.e., the first end of the described first capacitor.Described first transformer T1 times of the anode connection of the third diode D3
The second end of grade winding；The cathode connection filter module 130 of the third diode D3, i.e., the first of the described first capacitor
End.
It should be noted that the rectification unit 113 in the present embodiment is preferably half-wave rectifying circuit, in practical applications,
Suitable rectification unit can be designed according to the working environment and power demand of circuit.Not to the company of rectification unit in the present embodiment
It connects relationship and type is defined.
Further, the start-up circuit of the Switching Power Supply further include: drive module 160；
Wherein, the first end of the drive module 160 connects the third end of the square wave generating unit 111, i.e., and described
The grid of one power tube Q1；The second end of the drive module 160 connects the 4th end i.e. described of the square wave generating unit
The grid of two power tube Q2.
Further, the drive module 160 includes: control unit 161, isolated location 162, the first driving unit 163
With the first driving unit 164；161 first end of described control unit connects 162 first end of isolated location, described control unit
161 second ends connect 162 second end of isolated location；The 162 third end of isolated location connects first driving unit
163 first ends, the 4th end of isolated location 12 connect 164 first end of the second driving unit；First driving unit
163 second ends connect the 111 third end of square wave generating unit, and 164 second end of the second driving unit connects the square wave
The 4th end of generating unit 111.
It should be noted that drive module 160 is the start-up circuit of Switching Power Supply in the present embodiment to realize that its is original
Function setting driving circuit.Drive module 160 can be wanted according to the concrete type and work of the start-up circuit of Switching Power Supply
It asks and is configured, drive module 160 is not defined in the present embodiment.
The utility model embodiment additionally provides a kind of electronic equipment, and the electronic equipment includes as mentioned in above-described embodiment
The start-up circuit of any Switching Power Supply supplied.
The start-up circuit of Switching Power Supply provided by the utility model any embodiment can be performed in above-mentioned electronic equipment, has
The corresponding functional module of execution circuit and beneficial effect.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of start-up circuit of Switching Power Supply characterized by comprising resonant transformation module, filter module, protective module with
And first power module；
The resonant transformation module is connect with the filter module, and the filter module connects the first end of the protective module,
The second end of the protective module connects first power module；
When the voltage value at the filter module both ends is less than the first power module voltage value, the protective module is led
Logical, first power module is charged by the protective module to the filter module, to reduce the resonant transformation module
Flow into the electric current of the filter module.
2. circuit according to claim 1, which is characterized in that when the voltage value at the filter module both ends is greater than or equal to
When the first power module voltage value, the protective module shutdown.
3. circuit according to claim 1, which is characterized in that the protective module includes: first diode；Described first
The anode of diode connects first power module, and the cathode of the first diode connects the filter module.
4. circuit according to claim 1, which is characterized in that the resonant transformation module includes: square wave generating unit, humorous
Shake unit and rectification unit,
The first end of the square wave generating unit connects the first end of the resonant element, the second end of the square wave generating unit
Connect the second end of the resonant element；
The third end of the resonant element connects the rectification unit first end；The 4th end connection of the resonant element is described whole
Flow the second end of unit；
The third end of the rectification unit connects the filter module.
5. circuit according to claim 4, which is characterized in that the square wave generating unit includes the first power tube and second
Power tube；
The first end of first power tube connects second power supply module, and the second end of first power tube is separately connected described
The first end of the first end of second power tube, the resonant element；
The second end of second power tube connects the second end of the resonant element.
6. circuit according to claim 4, which is characterized in that the resonant element includes series resonance inductor, in parallel humorous
Shake inductance, series resonant capacitance and the first transformer；
The first end of the series resonance inductor connects the first end of the square wave generating unit, and the of the series resonance inductor
Two ends are separately connected the first end of the first primary winding, the first end of the parallel resonant inductor；
The first end of the series resonant capacitance connects the second end of the square wave generating unit, and the of the series resonant capacitance
Two ends are separately connected the second end of the first primary winding, the second end of the parallel resonant inductor；
The first end of the first transformer secondary output winding connects the first end of the rectification unit；First transformer secondary output
The second end of winding connects the second end of the rectification unit.
7. circuit according to claim 6, which is characterized in that the parallel resonant inductor is the excitation electricity of the first transformer
Sense.
8. circuit according to claim 4, which is characterized in that the rectification unit includes the second diode and the three or two pole
Pipe；
The anode of second diode connects the first end of the first transformer secondary output winding, and the cathode of second diode connects
Connect the filter module；
The anode of the third diode connects the second end of the first transformer secondary output winding, the yin of the third diode
Pole connects the filter module.
9. circuit according to claim 4, which is characterized in that further include: drive module；
Wherein, the first end of the drive module connects the third end of the square wave generating unit；The second of the drive module
End connects the 4th end of the square wave generating unit.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes switch electricity as described in any one of claim 1 to 9
The start-up circuit in source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920211050.2U CN209313721U (en) | 2019-02-18 | 2019-02-18 | A kind of start-up circuit and electronic equipment of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920211050.2U CN209313721U (en) | 2019-02-18 | 2019-02-18 | A kind of start-up circuit and electronic equipment of Switching Power Supply |
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| Publication Number | Publication Date |
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| CN209313721U true CN209313721U (en) | 2019-08-27 |
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| CN201920211050.2U Active CN209313721U (en) | 2019-02-18 | 2019-02-18 | A kind of start-up circuit and electronic equipment of Switching Power Supply |
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| Country | Link |
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2019
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