CN110429832A - A kind of switching power circuit and television set - Google Patents
A kind of switching power circuit and television set Download PDFInfo
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- CN110429832A CN110429832A CN201910720989.6A CN201910720989A CN110429832A CN 110429832 A CN110429832 A CN 110429832A CN 201910720989 A CN201910720989 A CN 201910720989A CN 110429832 A CN110429832 A CN 110429832A
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching power circuit and television set, the switching power circuit includes EMI filter module, rectification module, input filter module, conversion module, output filter module and common mode interference suppression module；The EMI filter module includes DM EMI filter unit and common mode interference filter unit；Alternating current is exported after the filtering processing of EMI filter module by input filter module carry out rectification processing to rectification module after become direct current, direct current is converted into predeterminated voltage by conversion module and is exported by output filter module to electrical equipment；The DM EMI signal and common mode interference signal that the DM EMI filter unit and common mode interference filter unit are used to that the conversion module to be inhibited to generate when working respectively, the common mode interference suppression module is used to inhibit the interference signal between input filter module and output filter module, this invention simplifies the circuit structures of EMI filter module, improve Electromagnetic Compatibility.
Description
Technical field
The present invention relates to power technique fields, in particular to a kind of switching power circuit and television set.
Background technique
With the development of society, people are higher and higher, correspondence to the volume, weight, cost requirement of various machinery equipments
The requirement to Switching Power Supply it is also higher, and the design difficulty of the EMI filter circuit in Switching Power Supply increases, and cost increases,
Middle EMI filter circuit is the low-pass filter circuit by current-limiting reactor and shunt capacitor.And existing EMI filter circuit is more multiple
It is miscellaneous, 2 common mode inductances, 2 X capacitors and more Y capacitance are needed, wherein X capacitor is to inhibit powered electromagnetic interference electricity container, Y
Capacitor is the capacitor being connected across between two line of power line and ground respectively, and higher cost, leakage current is larger, so that the peace that power supply needs
Full device is more, Yi Yinfa safe mass problem.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of switching power circuit and TVs
Machine reduces the use of Y capacitance, and then simplify the knot of Switching Power Supply by simplifying the structure of EMI filter circuit in Switching Power Supply
Structure reduces the use of safety device, reduces the cost of Switching Power Supply, improves security reliability.
In order to achieve the above object, this invention takes following technical schemes:
A kind of switching power circuit, including EMI filter module, rectification module, input filter module, conversion module, output
Filter module and common mode interference suppression module；The EMI filter module includes DM EMI filter unit and common mode interference filtering
Unit；The alternating current of AC power source output is filtered through the DM EMI filter unit and the common mode interference filter unit
To the rectification module, the rectification module exports direct current to institute after being rectified filtered alternating current for output after processing
Input filter module is stated, output is described to the conversion module after the direct current is filtered by the input filter module
Output to the output filter module, the output filters mould after filtered direct current is converted into predeterminated voltage by conversion module
Block exports after being filtered to the predeterminated voltage to electrical equipment；
The DM EMI signal that the DM EMI filter unit is used to that the conversion module to be inhibited to generate when working, it is described
The common mode interference signal that common mode interference filter unit is used to that the conversion module to be inhibited to generate when working, the common mode interference inhibit
Module is used to inhibit the interference signal between the input filter module and the output filter module, the input filter module
Electromagnetic interference for inhibiting the conversion module to generate.
In the switching power circuit, the conversion module includes switching tube, transformer, by-pass unit, the first buffering
Absorptive unit and the second snubber unit, the switching tube are used to control the input and disconnection of the direct current, the transformation
Device is exported for the direct current to be converted into the predeterminated voltage to the output filter module；The by-pass unit is for pressing down
Make the electromagnetic interference that the transformer generates；The first snubber unit is used to absorb the point that the transformer generates
Peak voltage；The interference letter that the second snubber unit is used to that the switching tube to be inhibited to generate during on or off
Number.
In the switching power circuit, the conversion module includes switching tube, transformer and the first snubber unit,
The switching tube is used to control the switch oscillating of the direct current, and the transformer is described pre- for the direct current to be converted into
If voltage output is to the output filter module；The first snubber unit is used to absorb the spike that the transformer generates
Voltage.
In the switching power circuit, the DM EMI filter unit includes X capacitor, and one end of the X capacitor connects
The common mode interference filter unit and firewire are connect, the other end of the X capacitor connects the common mode interference filter unit and zero curve.
In the switching power circuit, the common mode interference filter unit includes common mode inductance, the first Y capacitance and second
Y capacitance, the 1st foot of the common mode inductance connect one end of the X capacitor, and the 4th foot of the common mode inductance connects the X capacitor
The other end, the 2nd foot of the common mode inductance connects one end of second Y capacitance, and the 3rd foot of the common mode inductance connects institute
State one end of the first Y capacitance, the other end of the other end of first Y capacitance and second Y capacitance is grounded.
In the switching power circuit, the input filter module includes first capacitor, one end of the first capacitor
Connect the 1st foot of the rectification module, the first snubber unit and the transformer, the other end of the first capacitor
Ground connection.
In the switching power circuit, the common mode interference suppression module includes third Y capacitance, the third Y capacitance
One end connect the ground terminal of the output filter module, the other end of the third Y capacitance connects connecing for the first capacitor
Ground terminal.
In the switching power circuit, the first snubber unit includes the second capacitor, first resistor and first
Two pipe poles, one end of second capacitor connect one end of the first capacitor, one end of the first resistor and the transformation
1st foot of device, the other end of second capacitor connects the other end of the first resistor and the another of the first diode is born
Pole, the anode of the first diode connect the first connecting pin of the 3rd foot of the transformer, the switching tube.
In the switching power circuit, the second snubber unit includes third capacitor and second resistance, described
One end of third capacitor connects the 3rd foot and the first snubber unit of the transformer, the third capacitor it is another
End is grounded by the second resistance.
A kind of television set, including switching power circuit as described above.
Compared to the prior art, a kind of switching power circuit and television set provided by the invention, the switching power circuit
Inhibit mould including EMI filter module, rectification module, input filter module, conversion module, output filter module and common mode interference
Block；The EMI filter module includes DM EMI filter unit and common mode interference filter unit；The alternating current of AC power source output
It is exported after the DM EMI filter unit and the common mode interference filter unit are filtered to the rectification module,
Output direct current to the input filter module, the input is filtered after the rectification module is rectified filtered alternating current
Output to the conversion module, the conversion module turns filtered direct current after the direct current is filtered by wave module
Output is changed after predeterminated voltage into the output filter module, after the output filter module is filtered the predeterminated voltage
It exports to electrical equipment；The DM EMI letter that the DM EMI filter unit is used to that the conversion module to be inhibited to generate when working
Number, the common mode interference signal that the common mode interference filter unit is used to that the conversion module to be inhibited to generate when working, the common mode
AF panel module is used to inhibit the interference signal between the input filter module and the output filter module, the input
The electromagnetic interference that filter module is used to that the conversion module to be inhibited to generate, by simplifying EMI filter circuit in Switching Power Supply
Structure, reduce the use of Y capacitance, and then simplify the structure of Switching Power Supply, reduce the cost of Switching Power Supply, improve product
Electro Magnetic Compatibility.
Detailed description of the invention
Fig. 1 is the structural block diagram of switching power circuit provided by the invention；
Fig. 2 is the circuit diagram of the first preferred embodiment of switching power circuit provided by the invention；
Fig. 3 is the first Y capacitance, the second Y capacitance and third Y capacitance and screw in switching power circuit provided by the invention
The connection schematic diagram on ground, primary ground and screen backboard；
Fig. 4 is the circuit diagram of the second preferred embodiment of switching power circuit provided by the invention.
Specific embodiment
The present invention provides a kind of switching power circuit and television set, passes through the knot for simplifying EMI filter circuit in Switching Power Supply
Structure, reduces the use of Y capacitance, and then simplifies the structure of Switching Power Supply, reduces the cost of Switching Power Supply.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
Switching power circuit provided by the invention, in addition to be used in television field other than, other field such as liquid crystal display,
Laptop, adapter etc. also can be used, and can be effectively reduced cost, reduce power volume, reduce interference signal,
Improve Electromagnetic Compatibility.
Referring to Fig. 1, it is provided by the invention include EMI filter module 100, rectification module 200, input filter module 300,
Conversion module 400, output filter module 500 and common mode interference suppression module 600, the EMI filter module 100 are dry including differential mode
Disturb filter unit 110 and common mode interference filter unit 120；The EMI filter module 100 connects the zero curve N of external ac power source
With firewire L, specifically the DM EMI filter unit 110 connects the zero curve N and firewire L of the AC power source, the differential mode
Interference filter unit 110 also connects the rectification module 200, the rectification module by the common mode interference filter unit 120
200 are also connected with the input filter module 300, and the input filter module 300 is also connected with the conversion module 400 and described total
Mould AF panel module 600, the common mode interference suppression module 600 and the conversion module 400 are also all connected with the output filter
Wave module 500, the output filter module 500 are also connected with electrical equipment, described defeated if the electrical equipment is television set
Filter module 500 connects the mainboard of the television set out, says using electrical equipment as television set to the program in the present embodiment
It is bright.
The alternating current of the AC power source output filters single through the DM EMI filter unit 110 and the common mode interference
To the rectification module 200, the rectification module 200 carries out filtered alternating current for output after member 120 is filtered
Direct current is exported after rectification to the input filter unit, after the direct current is filtered by the input filter module 300
Output to the conversion module 400, the conversion module 400 exports after filtered direct current is converted into predeterminated voltage to institute
Output filter module 500 is stated, the output filter module 500 exports after being filtered to the predeterminated voltage to electrical equipment,
And then operating voltage is provided for the electrical equipment, it is ensured that the normal work of the electrical equipment, wherein the predeterminated voltage is
Operating voltage required for the electrical equipment.
Wherein, the differential mode that the DM EMI filter unit 110 is used to that the conversion module 400 to be inhibited to generate when working is dry
Signal is disturbed, the common mode interference letter that the common mode interference filter unit 120 is used to that the conversion module 400 to be inhibited to generate when working
Number, the common mode interference suppression module 600 for inhibit the input filter module 300 and the output filter module 500 it
Between interference signal, the electromagnetic interference that the input filter module 300 is used to that the conversion module 400 to be inhibited to generate.
After the conversion module 400 enters working condition, i.e., the described switching power circuit enters working condition for institute
State power supply for electrical equipment, the conversion module 400 and the electrical equipment can generate during the work time DM EMI signal and
Common mode interference signal, wherein the DM EMI signal be firewire L or zero curve N over the ground between interference signal, the common mode
Interference signal is the interference signal in AC power source between zero curve N and firewire L；At this time by the DM EMI filter module into
Row filtering processing can filter out the DM EMI signal, and the DM EMI signal is avoided to export by alternating-current power supply socket CN1
To power grid and other electrical equipments, the work of other electrical equipments is interfered；Conversely, the DM EMI signal that the power grid generates is logical
It crosses after alternating-current power supply socket CN1 by the common mode interference filter unit 120, it can also be by the DM EMI filter unit
110 are filtered removing, and then avoid interfering the normal work of the electrical equipment.
And the common mode interference signal that the conversion module 400 and the electrical equipment generate can then pass through the common mode interference
Filter unit 120 removes after being filtered, so avoid the common mode interference signal exported by socket CN1 to power grid and
Other electrical equipments interfere the work of other electrical equipments, conversely, the common mode interference signal that the power grid generates passes through alternating current
By the common mode interference filter unit 120 after power outlet CN1, can also be filtered by the common mode interference filter unit 120
Wave removes, and then avoids interfering the normal work of the electrical equipment.
One common mode AF panel is wherein set between the input filter module 300 and the output filter module 500
Module 600 can then filter out the common-mode noise of 500 output end of output filter module, for balancing the input filter module
Interference signal between 300 and the output filter module 500 avoids the input filter module 300 and the output from filtering
Interference signal between module 500 is larger, interferes the work of electrical equipment.
Further, referring to Fig. 2, in the first preferred embodiment, the conversion module 400 includes switching tube Q1, becomes
Depressor T, by-pass unit 430, the first snubber unit 410 and the second snubber unit 420, the first of the switching tube Q1
Connecting pin connects the 3rd foot and the second snubber unit of the first snubber unit 410, the transformer T
The second connection end of 420, the switching tube Q1 are grounded, the control terminal connection switch control circuit of the switching tube Q1, wherein institute
Stating ON-OFF control circuit is the prior art, and it is not described here in detail for specific connection relationship；The first snubber unit 410
Connect the 1st foot and the 3rd foot of the second snubber unit 420, the transformer T, the 11st foot of the transformer T and
12 feet connect the mainboard and the output filter module 500, it is preferable that the switching tube Q1 is metal-oxide-semiconductor, certain transformation
Snubber unit can be designed change according to actual conditions in module 400, not limit this in the application.
The switching tube Q1 is used to control the switch oscillating of the direct current, and the transformer T is used for the direct current
The predeterminated voltage is converted into export to the output filter module 500；The by-pass unit 430 is for inhibiting the transformer
The electromagnetic interference that T is generated；The first snubber unit 410 is used to absorb the peak voltage that the transformer T is generated；
The interference signal that the second snubber unit 420 is used to that the switching tube Q1 to be inhibited to generate during on or off,
When the switching tube Q1 is disconnected, the transformer T is because Lenz's law can instantaneously generate higher peak voltage, spike electricity
Pressure can be absorbed by the first snubber unit 410, arrive ground using by-pass unit 430 to input filter module 300 later, into
And reduce radio circuit, high frequency spikes interference is filtered out, generates higher electromagnetic radiation when reducing transformer T work；And described
Two snubber units 420 then filter out the interference signal that the switching tube Q1 is generated during on or off, while can also
Absorb the heat that the switching tube Q1 is generated, the operating temperature rise of the less switching tube Q1, it is ensured that the switching power circuit work
The safety of work.
When it is implemented, the DM EMI filter unit 110 includes X capacitor CX1, one end of the X capacitor CX1 is connected
The other end of the common mode interference filter unit 120 and firewire L, the X capacitor CX1 connect the common mode interference filter unit
120 and zero curve N, the X capacitor CX1 are located at ac power input end, what the electrical equipment and the conversion module 400 generated
DM EMI signal avoids the DM EMI signal from passing through the alternating-current power supply socket CN1 after X capacitor CX1 filtering
It is output to power grid or other electrical equipments, interferes the normal work of other electrical equipments, on the contrary the differential mode that the power grid generates
Interference signal after alternating-current power supply socket CN1 by the first capacitor C1 by that after the X capacitor CX1, can also be filtered
Wave removes, and then avoids interfering the normal work of the electrical equipment, while saving for traditional switching power circuit
An X capacitor has been saved, the circuit structure of EMI filter module 100 is simplified.
Further, also referring to Fig. 3, the common mode interference filter unit 120 includes common mode inductance L, the first Y capacitance
CY1 and the second Y capacitance CY2, the 1st foot of the common mode inductance L connect one end of the X capacitor CX1, the common mode inductance L's
4th foot connects the other end of the X capacitor CX1, and the 2nd foot of the common mode inductance L connects one end of the second Y capacitance CY2,
The 3rd foot of the common mode inductance L connects one end of the first Y capacitance CY1, the other end of the first Y capacitance CY1 and described
The other end of second Y capacitance CY2 is grounded, wherein the ground terminal of the first Y capacitance CY1 and the second Y capacitance CY2 are equal
The common mode interference signal that for screw A, the conversion module 400 and the electrical equipment generate passes through at common mode inductance L filtering
Reason, avoids the common mode interference signal from being output in power grid by alternating-current power supply socket CN1, interferes the work of other electrical equipments
Make；Meanwhile the common mode interference signal that power grid generates is by being filtered place by common mode inductance L after alternating-current power supply socket CN1
Reason removes, and avoids the common mode interference signal on power grid to the electrical equipment, relative to the EMI in traditional switching power circuit
For filter circuit, a common mode inductance L is saved, it is only necessary to which a common mode inductance L further simplifies EMI filter module
100 circuit structure reduces the use of safety device, reduces the risk of security reliability；Wherein, the common mode inductance L is adopted
With the common mode annular coil inductance of flat wire coiling, the common mode inductance L and the first Y capacitance CY1 and the second Y capacitance CY2
Constitute LC mode filter.
Preferably, the inductance value of the common mode inductance L is 10mL or 18mL, specifically can be according to the inductance of common mode inductance L
The capacitance of the first Y capacitance and the second Y capacitance is calculated in value；If the inductance value of the common mode inductance L is 18mL, described the
The capacitance of one Y capacitance and second Y capacitance is equal, and is passed throughWithEasily derive the first Y capacitance
Approximate formula:Assuming that fc=55KHz, then the capacitance of the first Y capacitanceWherein, Z indicates that the coil turn of common mode inductance L, fc indicate
Cutoff frequency, the i.e. inductance value of the first Y capacitance and the second Y capacitance described in the present embodiment are 465.6pF.
Further, the rectification module 200 includes rectifier bridge, between the common mode inductance L and rectifier bridge to screw between A
Connect two Y capacitances, respectively the first Y capacitance CY1 and the second Y capacitance CY2, screw A be also connected with the screen backboard by television set；
When the common mode interference signal that the electrical equipment and the conversion module 400 generate during the work time passes through rectifier bridge to zero curve
N is corresponding dry perhaps on firewire L so that there are interference signals between the secondary ground B of the zero curve N or firewire L and transformer T
Disturbing signal, to screw A is filtered out by the first Y capacitance CY1 and the second Y capacitance CY2, and then it is dry to reduce common mode
Disturb interference of the signal to other electrical equipments；Meanwhile the common mode interference signal that power grid generates passes through after alternating-current power supply socket CN1
After by the first Y capacitance CY1 and the second Y capacitance CY2 and screw A bypass, i.e., the described first Y capacitance CY1 and the 2nd Y electricity
Hold the shunt capacitance that CY2 is zero curve N and firewire L, avoids the common mode interference signal on power grid from interfering with the electrical equipment i.e. electric
Depending on the normal work of machine, and the number of Y capacitance used in contrast is decreased, simplifies the circuit of EMI filter module 100
Structure, and the earthing mode by optimizing the first Y capacitance CY1 and the second Y capacitance CY2, can further decrease institute
State the electromagnetic interference in switching power circuit.
Further, the input filter module 300 includes first capacitor C1, and one end of the first capacitor C1 connects institute
The 1st foot of rectification module 200, the first snubber unit 410 and the transformer T is stated, the first capacitor C1's is another
One end ground connection, the Power Groud of the switching tube Q1 individually connects the first capacitor C1, so that in the switching power circuit
Major loop is minimum, and then reduces the electromagnetic radiation that transformer T is generated by loop when the switching power circuit works.
Further, the common mode interference suppression module 600 include third Y capacitance CY3, the one of the third Y capacitance CY3
End connects described in the other end connection of the ground terminal namely secondary ground B, the third Y capacitance CY3 of the output filter module 500
The ground terminal of first capacitor C1 namely primary ground D, by the input filter module 300 and the output filter module 500
Between add a third Y capacitance CY3, for the interference signal between the primary ground D and secondary ground B of balancing transformer T, avoid because
Interference signal between primary ground D and secondary ground B is larger, and the interference signal of the primary ground D passes through transformer T to secondary ground B,
And then the normal work for the function device that other connect with mainboard is interfered with, or the function device connecting with TV SKD produces
Raw interference signal passes through the arrangement bridge to alternating-current power supply socket by transformer T to primary ground D to rectifier bridge later
CN1 interferes with the normal work of other electrical equipments to power grid；The common mode interference signal that power grid generates simultaneously, such as surge or quiet
Electricity is switched to by arranging bridge to first capacitor C1 later by being filtered after alternating-current power supply socket CN1 to common mode inductance L
The secondary ground B of transformer T is filtered out, and then the common mode interference signal is avoided to interfere even the switching power circuit
Punch through damage device, i.e., the described switching power circuit pass through a common mode inductance L, an X capacitor and the letter of fewer number of Y capacitance
Change circuit structure, optimizes the earthing mode of the first Y capacitance CY1, the second Y capacitance CY2 and third Y capacitance, institute
With stating screw A, secondary ground B and screen backboard C screen backboard on link together, this kind of connection type enables to the switch
The electromagnetic radiation of power circuit is minimum, and circuit is more stable, further increases Electromagnetic Compatibility.
Further, please continue to refer to Fig. 2, the first snubber unit 410 includes the second capacitor C2, first resistor
R1 and the one or two pipe pole, one end of the second capacitor C2 connect one end of the first capacitor C1, the first resistor R1
The other end of 1st foot of one end and the transformer T, the second capacitor C2 connects the other end and the institute of the first resistor R1
The another cathode of first diode D1 is stated, the anode of the first diode D1 connects the 3rd foot, the switch of the transformer T
The first connecting pin of pipe Q1 and the second snubber unit 420；When the switching tube Q1 disconnect when, the transformer T because
For Lenz's law, moment generates higher peak voltage, and the peak voltage can be transferred in the second capacitor C2 and be deposited
Storage, then the electric energy of the second capacitor C2 storage is consumed or is returned power supply by the first resistor R1, and then realizes buffering
The effect of peak voltage.
Further, the second snubber unit 420 includes third capacitor C3 and second resistance R2, the third electricity
The one end for holding C3 connects the 3rd foot of the transformer T and the anode of the first diode D1, and the third capacitor C3's is another
End is grounded by the second resistance R2, and the third capacitor C3 and the second resistance R2 constitute RC circuit, the switch
Increase RC circuit between pipe Q1 and Power Groud, the interference letter that the switching tube Q1 is generated in disconnection or closing process can be filtered out
Number, while the heat generated in the switching tube Q1 work will be absorbed, and then reduce the operating temperature rise of switching circuit.
Further, the by-pass unit 430 includes the 4th capacitor C4, one end connection described the of the 4th capacitor C4
The cathode of the other end of two capacitor C2, the other end of first resistor R1 and the first diode D1, the 4th capacitor C4's
Other end ground connection, the peak voltage that the transformer T is generated can pass through before absorbing by the first snubber unit 410
The shunt capacitance i.e. ground terminal of the 4th capacitor C4 to first capacitor C1 so that radio circuit is minimum, and then effectively filters out high frequency point
The interference that peak voltage generates reduces the electromagnetic radiation that the transformer T is generated.
Further, it is two pole of afterflow that the conversion module 400, which further includes the second diode D2, the second diode D2,
Pipe, the output filter module 500 include the 5th capacitor C5, and the anode of the second diode D2 connects the transformer T1's
11st foot and the 12nd foot, the cathode of the second diode D2 connect one end and the mainboard of the 5th capacitor C5, and the described 5th
The other end of capacitor C5 is grounded, wherein the ground terminal of the 5th capacitor C5 is secondary ground B, by the pre- of transformer T output
It is the electricity consumption if voltage can export again after the output filter module 500 is filtered to the electrical equipment
Equipment is powered, and in order to balance the interference signal between the first capacitor C1 and the 5th capacitor C5, described
It is provided with a third Y capacitance CY3 between one capacitor C1 and the 5th capacitor C5, institute can be filtered out by the third Y capacitance CY3
The common-mode noise of 500 output end of output filter module is stated, i.e., when there are common-mode noises for the output end of the output filter module 500
When, the ground terminal i.e. primary ground D for flowing back into first capacitor C1 can be bypassed by third Y capacitance CY3, to filter out output filtering mould
The value of the common-mode noise of 500 output end of block, the third Y capacitance CY3 can take according to the intensity difference of output common mode noise
Value is different, in the case where meeting safety requirement, the value of the CY3 of third Y capacitance described in the present embodiment be 100pF~
4700pF also can choose other values in other embodiments, and this is not limited by the present invention.
Further, referring to Fig. 4, in the second preferred embodiment, the conversion module 400 includes switching tube Q1, becomes
Depressor T1 and the first snubber unit 410, the switching tube Q1 are used to control the input and disconnection of the direct current, the change
Depressor T1 is exported for the direct current to be converted into the predeterminated voltage to the output filter module 300；Described first is slow
The peak voltage that absorptive unit 410 is generated for absorbing the transformer T1 is rushed, the part due to adding radiation absorption circuit is made
It is higher at the loss of ON-OFF control circuit, therefore when the electromagnetic radiation in the switching power circuit is smaller, it is only necessary to including
The first snubber unit 410 of two capacitor C2, first resistor R1 and the one or two pipe pole D1 absorb the spike electricity that transformer generates
The function of reducing electromagnetic radiation can be realized in pressure, and reduces the temperature rise of the ON-OFF control circuit.
Based on above-mentioned switching power circuit, the present invention further correspondingly provides a kind of television set, and the television set includes such as
The upper switching power circuit, since the switching power circuit being described in detail above, details are not described herein again.
In conclusion a kind of switching power circuit provided by the invention and television set, the switch electricity
Source circuit includes EMI filter module, rectification module, input filter module, conversion module, output filter module and common mode interference suppression
Molding block；The EMI filter module includes DM EMI filter unit and common mode interference filter unit；The friendship of AC power source output
Galvanic electricity exports after the DM EMI filter unit and the common mode interference filter unit are filtered to the rectification
Module, output direct current is described to the input filter module after the rectification module is rectified filtered alternating current
Output to the conversion module, the conversion module will be filtered straight after the direct current is filtered by input filter module
Output to the output filter module, the output filter module carries out the predeterminated voltage after galvanic electricity is converted into predeterminated voltage
It exports after filtering to electrical equipment；The differential mode that the DM EMI filter unit is used to that the conversion module to be inhibited to generate when working
Interference signal, the common mode interference signal that the common mode interference filter unit is used to that the conversion module to be inhibited to generate when working, institute
Common mode interference suppression module is stated for inhibiting the interference signal between the input filter module and the output filter module, institute
Electromagnetic interference of the input filter module for inhibiting the conversion module to generate is stated, is filtered by simplifying EMI in Switching Power Supply
The structure of wave circuit, reduces the use of Y capacitance, and then simplifies the structure of Switching Power Supply, reduces the cost of Switching Power Supply, mentions
High product Electro Magnetic Compatibility.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of switching power circuit, which is characterized in that including EMI filter module, rectification module, input filter module, transformation
Module, output filter module and common mode interference suppression module；The EMI filter module includes DM EMI filter unit and common mode
Interference filter unit；The alternating current of AC power source output is through the DM EMI filter unit and the common mode interference filter unit
To the rectification module, the rectification module exports straight after being rectified filtered alternating current for output after being filtered
To the input filter module, the input filter module exports after being filtered the direct current to the transformation mould galvanic electricity
Block, output is described defeated to the output filter module after filtered direct current is converted into predeterminated voltage by the conversion module
It exports after filter module is filtered the predeterminated voltage out to electrical equipment；
The DM EMI signal that the DM EMI filter unit is used to that the conversion module to be inhibited to generate when working, the common mode
The common mode interference signal that interference filter unit is used to that the conversion module to be inhibited to generate when working, the common mode interference suppression module
For inhibiting the interference signal between the input filter module and the output filter module, the input filter module is used for
The electromagnetic interference for inhibiting the conversion module to generate.
2. switching power circuit according to claim 1, which is characterized in that the conversion module includes switching tube, transformation
Device, by-pass unit, the first snubber unit and the second snubber unit, the switching tube is for controlling the direct current
Input and disconnection, the transformer are used to for the direct current to be converted into the predeterminated voltage to export to the output to filter mould
Block；The electromagnetic interference that the by-pass unit is used to that the transformer to be inhibited to generate；The first snubber unit is used for
Absorb the peak voltage that the transformer generates；The second snubber unit is for inhibiting the switching tube being connected or closing
The interference signal generated during disconnected.
3. switching power circuit according to claim 1, which is characterized in that the conversion module includes switching tube, transformation
Device and the first snubber unit, the switching tube are used to control the switch oscillating of the direct current, and the transformer is used for will
The direct current is converted into the predeterminated voltage and exports to the output filter module；The first snubber unit is for inhaling
Receive the peak voltage that the transformer generates.
4. switching power circuit according to claim 2 or 3, which is characterized in that the DM EMI filter unit includes X
Capacitor, one end of the X capacitor connect the common mode interference filter unit and firewire, described in the other end connection of the X capacitor
Common mode interference filter unit and zero curve.
5. switching power circuit according to claim 4, which is characterized in that the common mode interference filter unit includes common mode
Inductance, the first Y capacitance and the second Y capacitance, the 1st foot of the common mode inductance connect one end of the X capacitor, the common mode inductance
The 4th foot connect the other end of the X capacitor, the 2nd foot of the common mode inductance connects one end of second Y capacitance, described
3rd foot of common mode inductance connects one end of first Y capacitance, the other end of first Y capacitance and second Y capacitance
The other end is grounded.
6. switching power circuit according to claim 5, which is characterized in that the input filter module includes the first electricity
Hold, one end of the first capacitor connects the 1st of the rectification module, the first snubber unit and the transformer
Foot, the other end ground connection of the first capacitor.
7. switching power circuit according to claim 6, which is characterized in that the common mode interference suppression module includes third
Y capacitance, one end of the third Y capacitance connect the ground terminal of the output filter module, and the other end of the third Y capacitance connects
Connect the ground terminal of the first capacitor.
8. switching power circuit according to claim 6, which is characterized in that the first snubber unit includes second
Capacitor, first resistor and the one or two pipe pole, one end of second capacitor connect one end of the first capacitor, first electricity
1st foot of one end of resistance and the transformer, the other end of second capacitor connect the other end and the institute of the first resistor
State the another cathode of first diode, the anode of the first diode connect the 3rd foot of the transformer, the switching tube
One connecting pin.
9. switching power circuit according to claim 2, which is characterized in that the second snubber unit includes third
Capacitor and second resistance, one end of the third capacitor connect the 3rd foot and the first snubber unit of the transformer,
The other end of the third capacitor is grounded by the second resistance.
10. a kind of television set, which is characterized in that including switching power circuit as described in any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910720989.6A CN110429832A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power circuit and television set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910720989.6A CN110429832A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power circuit and television set |
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| CN110429832A true CN110429832A (en) | 2019-11-08 |
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| CN201910720989.6A Pending CN110429832A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power circuit and television set |
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| CN110808682A (en) * | 2019-11-26 | 2020-02-18 | 深圳创维－Rgb电子有限公司 | Switch power supply circuit without high-voltage large electrolytic capacitor and television |
| CN111987921A (en) * | 2020-08-11 | 2020-11-24 | 深圳创维－Rgb电子有限公司 | Switching power supply circuit, television and electronic equipment |
| CN113258789A (en) * | 2021-06-28 | 2021-08-13 | 珠海拓芯科技有限公司 | Switching power supply circuit and electronic equipment |
| CN113270931A (en) * | 2021-05-31 | 2021-08-17 | 赛尔康技术（深圳）有限公司 | Charger circuit and charger |
| CN113280459A (en) * | 2021-05-06 | 2021-08-20 | 宁波奥克斯电气股份有限公司 | Air conditioner EMC optimizing circuit, air conditioner controller and air conditioner |
| CN115085555A (en) * | 2022-05-20 | 2022-09-20 | 荣耀终端有限公司 | Power supply circuit and power adapter |
| CN116736103A (en) * | 2023-07-18 | 2023-09-12 | 通号工程局集团有限公司 | Portable relay detector and detection method thereof |
| WO2023246652A1 (en) * | 2022-06-20 | 2023-12-28 | 华为技术有限公司 | Power transmission system and power generation system |
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