CN103715904B - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN103715904B CN103715904B CN201310746979.2A CN201310746979A CN103715904B CN 103715904 B CN103715904 B CN 103715904B CN 201310746979 A CN201310746979 A CN 201310746979A CN 103715904 B CN103715904 B CN 103715904B
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- 238000001914 filtration Methods 0.000 claims abstract description 98
- 238000004804 winding Methods 0.000 claims description 55
- 230000005611 electricity Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 7
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- 238000005516 engineering process Methods 0.000 description 4
- 230000005669 field effect Effects 0.000 description 4
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- 238000005868 electrolysis reaction Methods 0.000 description 1
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Abstract
The embodiment of the invention discloses a power supply circuit, which comprises a high-voltage circuit unit and a low-voltage circuit unit, wherein the low-voltage circuit unit is composed of at least two rectifying and filtering circuits, the high-voltage circuit unit outputs voltage through the rectifying and filtering circuits in the low-voltage circuit unit, and the power supply circuit is characterized in that any two adjacent rectifying and filtering circuits are connected through a common anode diode. The invention has the advantages of less required devices, small occupied PCB area and low cost.
Description
Technical field
The present invention relates to a kind of power circuit, particularly relate to a kind of power supply electricity with at least two-way output
Road.
Background technology
Along with the high speed development of modern science and technology, the continuous renewal of power device, the development day of PWM technology
Becoming perfect, Switching Power Supply just develops towards short, little, light, thin direction.To contemporary electronic systems,
Even if from the point of view of the simplest electronic system being made up of single-chip microcomputer and single I/O interface circuit, its electricity
Source voltage the most also will be by+5V, the multichannel such as ± 15V or ± 12V composition, and to more complicated electronics
From the point of view of system, the actual supply voltage used is the most more.Therefore, doubleway output, so that multichannel is defeated
The existence gone out the most extremely is necessary.
Along with the high speed development of LED television, technology increasingly mature, competes more and more fierce, cost
Pressure is increasing, and the requirement to power supply is the harshest.Less, thinner, less expensive TV power supply is
Become the pursuit that Power Management Design engineer is consistent.As it is shown in figure 1, be currently used in two tunnels of LED television
In the traditional scheme of out-put supply, a road Vout1 supplies mainboard 12V, and a road Vout2 is to constant current backlight
Part, two-way rectification uses single diode respectively.
But such technical scheme has the disadvantage in that
1, each road needs single commutation diode, and the device of needs is many.
2, because the device used is many, so it is long-pending big to take PCB surface.
3, because the device used is many, so cost is high.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, it is provided that a kind of power circuit, permissible
A co-anode diode is used to realize the effect needing two-way rectification two-stage pipe to reach in prior art,
And the effect of multiple-channel output is realized by multiple co-anode diodes.
In order to solve above-mentioned technical problem, embodiments provide a kind of power circuit, including
High-tension circuit unit and the low-voltage circuit unit being at least made up of two current rectifying and wave filtering circuits, described high pressure
Circuit unit passes through the current rectifying and wave filtering circuit output voltage in described low-voltage circuit unit, arbitrary neighborhood
It is connected by co-anode diode between two described current rectifying and wave filtering circuits.
Further, described low-voltage circuit unit is by the first current rectifying and wave filtering circuit and the second rectifying and wave-filtering electricity
Road is constituted, and described high-tension circuit unit exports two-way voltage by described low-voltage circuit unit, and described the
One current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit are connected by the first co-anode diode, and described the
One co-anode diode has input, the first outfan and the second outfan, described first common-anode
The input of diode and the first outfan access described first current rectifying and wave filtering circuit, described first common anode
The input of pole diode and the second outfan access described second current rectifying and wave filtering circuit.
Further, described first current rectifying and wave filtering circuit includes the first secondary windings, described first level
One end ground connection of winding, the other end connects the input of described first co-anode diode, described the
It is in series with at least in parallel by two polarized electric capacity between first outfan and the ground of one co-anode diode
The first filter circuit constituted, the first outfan of described first co-anode diode is as described first
The output of current rectifying and wave filtering circuit.
Further, described second current rectifying and wave filtering circuit includes second subprime winding, described first common anode
Second outfan of pole diode connects one end of described second subprime winding, described second subprime winding
The other end and ground between be in series with at least by two polarized electric capacity the second filtered electrical constituted in parallel
Road, the other end of described second subprime winding is as the output of described second current rectifying and wave filtering circuit.
Further, described low-voltage circuit unit is by the first current rectifying and wave filtering circuit, the second rectifying and wave-filtering electricity
Road and the 3rd filter circuit are constituted, and described high-tension circuit unit exports three by described low-voltage circuit unit
Road voltage, described first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit pass through the first common-anode two pole
Pipe is connected, and described second current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit are by the second common-anode two pole
Pipe is connected.
Further, described first co-anode diode and the second co-anode diode are respectively provided with input
End, the first outfan and the second outfan, the input of described first co-anode diode and first defeated
Go out to terminate into described first current rectifying and wave filtering circuit, the input and second of described first co-anode diode
Outfan accesses described second current rectifying and wave filtering circuit, the input of described second co-anode diode and the
One outfan access described second current rectifying and wave filtering circuit, the input of described second co-anode diode and
Second outfan accesses described 3rd current rectifying and wave filtering circuit.
Further, described first current rectifying and wave filtering circuit includes the first secondary windings, described first level
One end ground connection of winding, the other end connects the input of described first co-anode diode, described the
It is in series with at least in parallel by two polarized electric capacity between first outfan and the ground of one co-anode diode
The first filter circuit constituted, the first outfan of described first co-anode diode is as described first
The output of current rectifying and wave filtering circuit.
Further, described second current rectifying and wave filtering circuit includes second subprime winding, described first common anode
Pole diode second outfan connect described second subprime winding one end, described second subprime around
The other end of group connects the input of described second co-anode diode, described second co-anode diode
The first outfan and ground between be in series with the second filtering constituted at least in parallel by two polarized electric capacity
Circuit, the first outfan of described second co-anode diode is as described second current rectifying and wave filtering circuit
Output.
Further, described 3rd current rectifying and wave filtering circuit includes third time level winding, described second common anode
Second outfan of pole diode connects one end of described third time level winding, described third time level winding
The other end and ground between be in series with at least by two polarized electric capacity the 3rd filtered electrical constituted in parallel
Road, the other end of described third time level winding is as the output of described 3rd current rectifying and wave filtering circuit.
Particularly, described first current rectifying and wave filtering circuit is output as 12V, for the master for LED television
Plate provides voltage, and the output of described second current rectifying and wave filtering circuit is for providing for LED television backlight circuit
Voltage.
Implement the embodiment of the present invention, have the advantages that
1, the diode used is few.
2, because the device used is few, amass little so taking PCB surface.
3, because the device used is few, so low cost.
Accompanying drawing explanation
Fig. 1 is prior art two-way output power supply circuit schematic diagram；
Fig. 2 is structure and the circuit diagram of two-way of the present invention output embodiment;
Fig. 3 is structure and the circuit diagram of another two-way of present invention output embodiment；
Fig. 4 is structure and the circuit diagram of the present invention three tunnel output embodiment.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this
Invention is described in further detail.
Fig. 2 is structure and the circuit diagram of two-way of the present invention output embodiment.Circuit shown in Fig. 2 is made
LED television power rectifier output circuit is can be used as, by including high-tension electricity for one embodiment of the present of invention
Road unit 10, and the low tension being made up of first current rectifying and wave filtering circuit the 1, second current rectifying and wave filtering circuit 2
Road unit 20.Described high-tension circuit unit 10 is by described first current rectifying and wave filtering circuit 1 and described second
Current rectifying and wave filtering circuit 2 exports two-way voltage.Described first current rectifying and wave filtering circuit the 1, second rectifying and wave-filtering electricity
Road 2 shares a first co-anode diode D, described first co-anode diode include input,
First outfan D1 and the second outfan D2.
HV in wherein said high-tension circuit unit 10 is big electrolysis High voltage output interface after AC rectification.
The voltage of the output V12 of described first current rectifying and wave filtering circuit 1 is 12 volts, is used for as LED television
Mainboard voltage is provided, the output VBL of described second current rectifying and wave filtering circuit 2 is for for LED television
Backlight circuit provides voltage.
Concrete, described first current rectifying and wave filtering circuit 1 also includes the first secondary windings S1, polarized electricity
Hold C1 and C2.In described first current rectifying and wave filtering circuit 1, the annexation of each device is as follows: described
One end ground connection of one secondary windings S1, the other end connects the input of described co-anode diode D, institute
Stating to be connected between described first outfan D1 and the ground of co-anode diode D has by described polarized electricity
Hold the circuit for filtering that C1 and C2 parallel connection is constituted.First output of described co-anode diode D
End D1 is as the output of described first current rectifying and wave filtering circuit 1.
Described second current rectifying and wave filtering circuit 2 includes second subprime winding S2, polarized electric capacity C3 and C4.
In described second current rectifying and wave filtering circuit 2, the annexation of each device is as follows: described co-anode diode D
Second outfan D2 connect described second subprime winding S2 one end, described second subprime winding S2
The other end and ground between be connected have be made up of polarized electric capacity C3 and C4 parallel connection for filtering electricity
Road.One end of described second subprime winding S2 is as the output of described second current rectifying and wave filtering circuit 2.
The operation principle of described first current rectifying and wave filtering circuit 1 is: when in described high-tension circuit unit 10
When field effect transistor Q turns off, just lower negative on the voltage on described first secondary windings S1, described common-anode
Diode D turns on, described first secondary windings S1 and co-anode diode D, polarized electric capacity C1,
C2 and load form loop, and described first secondary windings S1 provides described polarized electric capacity C1, C2
And load energy.When described field effect transistor Q turns on, on the voltage on described first secondary windings S1
Under Fu just, described co-anode diode D ends, described polarized electric capacity C1, C2 provide load
Energy, maintains 12V stable.
The operation principle of described second current rectifying and wave filtering circuit 2 is: when in described high-tension circuit unit 10
When field effect transistor Q turns off, on the voltage on described first secondary windings S1, second subprime winding S2
Just lower negative, described co-anode diode D turns on, described first secondary windings S1 and co-anode diode
D, second subprime winding S2, polarized electric capacity C3, C4 and load form loop, described first time
Level winding S1, second subprime winding S2 are provided with polar capacitor C3, C4 and load energy；When described
During the conducting of field effect transistor Q, under the voltage on the first secondary windings S1, second subprime winding S2 is born
Just, co-anode diode D ends, described polarized electric capacity C3, C4 maintain load energy.Institute
After stating the second outfan D2 that second subprime winding S2 is superimposed upon described co-anode diode D, pass through
The number of turn regulating described second subprime winding S2 can obtain the output voltage VBL of needs.
Fig. 3 is structure and the circuit diagram of another two-way output embodiment of the present invention.With Fig. 2
Illustrated embodiment is identical, and embodiment illustrated in fig. 3 includes first current rectifying and wave filtering circuit the 1, second rectifying and wave-filtering
Circuit 2 and high-tension circuit unit 10.Described high-tension circuit unit 10 is by described first rectifying and wave-filtering electricity
Road 1 and described second current rectifying and wave filtering circuit 2 export two-way voltage.Described first current rectifying and wave filtering circuit 1,
Second current rectifying and wave filtering circuit 2 shares a co-anode diode D, and described co-anode diode includes defeated
Enter end, the first outfan D1 and the second outfan D2.
Concrete, described first current rectifying and wave filtering circuit 1 includes the first secondary windings S1, the first resistor group
R1, polarized electric capacity C1, C2, polarity free capacitor C6, C7.Described first current rectifying and wave filtering circuit 1
In the annexation of each device as follows: one end ground connection of described first secondary windings S1, the other end connects
To the input of described co-anode diode D, the first outfan D1 of described co-anode diode D
Output as described first current rectifying and wave filtering circuit 1.The input of described co-anode diode D and
It is parallel with between one outfan D1 by described first resistor group R1 and described polarity free capacitor C6, C7
The RC filter circuit constituted, connects between the first outfan D1 and the ground of described co-anode diode D
There is the filter circuit being made up of polarized electric capacity C1, C2 parallel connection.Especially, described first resistor group
R1 is made up of three resistor coupled in parallel.
Described second current rectifying and wave filtering circuit 2 include second subprime winding S2, the second resistor group R2, the 3rd
Resistance R3, polarized electric capacity C3, C4, polarity free capacitor C5.Described second current rectifying and wave filtering circuit 2
In the annexation of each device as follows: the input of described co-anode diode D and the second outfan D2
Between be parallel with the RC filter circuit in series for electric capacity C5 by the second resistor group R2 and the 5th, institute
The the second outfan D2 stating co-anode diode D is connected to one end of described second subprime winding S2,
The other end of described second subprime winding S2 is as the output of described second current rectifying and wave filtering circuit 2.Described
It is connected between the other end and the ground of second subprime winding S2 and has by described polarized electric capacity C3, C4 and
The filter circuit that three resistance R3 parallel connections are constituted.Especially, described second resistor group R2 is by 4 resistance
Composition in parallel.
The operation principle of embodiment illustrated in fig. 3 is essentially identical with the operation principle of embodiment illustrated in fig. 2,
Do not repeat them here.
Fig. 4 is structure and the circuit diagram of example three tunnel of the present invention output embodiment.As shown in Figure 2
On the basis of embodiment, it is connected with another current rectifying and wave filtering circuit by another co-anode diode,
Constitute the power circuit of three tunnel outputs.
Concrete, in three tunnels export embodiment, described low-voltage circuit unit 20 ' is by the first rectifying and wave-filtering
Circuit 1 ', the second current rectifying and wave filtering circuit 2 ' and the 3rd filter circuit 3 ' are constituted, described high-tension circuit unit
10 ' export three road voltages by described low-voltage circuit unit 20 ', described first current rectifying and wave filtering circuit 1 ' and
Second current rectifying and wave filtering circuit 2 ' is connected by the first co-anode diode 1D, described second rectifying and wave-filtering electricity
Road 2 ' is connected by the second co-anode diode 2D with the 3rd current rectifying and wave filtering circuit 3 '.
Described first co-anode diode 1D has input, the first outfan 1D1 and second output
End 1D2, described second co-anode diode 2D have input, the first outfan 2D1 and second
Outfan 2D2, the input of described first co-anode diode 1D and the first outfan 1D1 access
Described first current rectifying and wave filtering circuit 1 ', the input of described first co-anode diode 1D and the second output
End 1D2 accesses described second current rectifying and wave filtering circuit 2 ', the input of described second co-anode diode 2D
End and the first outfan 2D1 access described second current rectifying and wave filtering circuit 2 ', described second common-anode two pole
The input of pipe 2D and the second outfan 2D2 access described 3rd current rectifying and wave filtering circuit 3 '.
Described first current rectifying and wave filtering circuit includes the first secondary windings S1, described first secondary windings S1
One end ground connection, the other end connect described first co-anode diode 1D input, described first
Be in series with between first outfan 1D1 and the ground of co-anode diode 1D by polarized electric capacity C1 and
The first filter circuit that C2 parallel connection is constituted, first outfan of described first co-anode diode 1D is made
1D1 is the output of described first current rectifying and wave filtering circuit 1 '.
Described second current rectifying and wave filtering circuit 2 ' includes second subprime winding S2, described first common-anode two pole
The second outfan 1D2 of pipe 1D connects one end of described second subprime winding S2, in described second time
The other end of level winding 2 connects the input of described second co-anode diode 2D, described second common anode
It is in series with by polarized electric capacity C3 and C4 also between first outfan 2D1 and the ground of pole diode 2D
The second filter circuit that connection is constituted, the first outfan 2D1 of described second co-anode diode 2D makees
Output for described second current rectifying and wave filtering circuit 2 '.
Described 3rd current rectifying and wave filtering circuit 3 ' includes third time level winding S3, described second common-anode two pole
The second outfan 2D2 of pipe 2D connects one end of described third time level winding S3, described third time level
Threeth filtering that constitutes in parallel by polarized electric capacity C5 and C6 it is in series with between the other end of winding and ground
Circuit, the other end of described third time level winding S3 is as the output of described 3rd current rectifying and wave filtering circuit 3 '.
According to the operation principle of embodiment illustrated in fig. 2, the work being readily obtained embodiment described in Fig. 4 is former
Reason, is not repeated herein.
It should be noted that according to same thought, based on technical solution of the present invention, it is possible to achieve the most
The power circuit on road.
The above is the preferred embodiment of the present invention, it is noted that general for the art
For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and
Retouching, these improvements and modifications are also considered as protection scope of the present invention.
Claims (2)
1. a power circuit, including high-tension circuit unit and is at least made up of two current rectifying and wave filtering circuits
Low-voltage circuit unit, described high-tension circuit unit is by the rectifying and wave-filtering in described low-voltage circuit unit
Circuit output voltage, it is characterised in that pass through between two described current rectifying and wave filtering circuits of arbitrary neighborhood
Co-anode diode is connected；
Described low-voltage circuit unit is made up of the first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, institute
State high-tension circuit unit and export two-way voltage, described first rectifying and wave-filtering by described low-voltage circuit unit
It is connected by described co-anode diode between circuit and the second current rectifying and wave filtering circuit, described common-anode two
Pole pipe has input, the first outfan and the second outfan, the input of described co-anode diode
With first outfan access described first current rectifying and wave filtering circuit, the input of described co-anode diode and
Second outfan accesses described second current rectifying and wave filtering circuit；
Described first current rectifying and wave filtering circuit includes the first secondary windings, one end of described first secondary windings
Ground connection, the other end connects the input of described co-anode diode, at the of described co-anode diode
It is in series with between one outfan and ground at least by two polarized electric capacity the first filtered electrical constituted in parallel
Road, the first outfan of described co-anode diode is as the output of described first current rectifying and wave filtering circuit；
Described second current rectifying and wave filtering circuit includes second subprime winding, the second of described co-anode diode
Outfan connects one end of described second subprime winding, the other end of described second subprime winding and ground
Between be in series with the second filter circuit being at least made up of, described second subprime two polarized electric capacity parallel connections
The other end of winding is as the output of described second current rectifying and wave filtering circuit.
Power circuit the most according to claim 1, it is characterised in that described first rectifying and wave-filtering electricity
Road is output as 12V, for providing voltage, described second rectifying and wave-filtering electricity for the mainboard of LED television
The output on road is for providing voltage for LED television backlight circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746979.2A CN103715904B (en) | 2013-12-30 | 2013-12-30 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746979.2A CN103715904B (en) | 2013-12-30 | 2013-12-30 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103715904A CN103715904A (en) | 2014-04-09 |
| CN103715904B true CN103715904B (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310746979.2A Active CN103715904B (en) | 2013-12-30 | 2013-12-30 | Power supply circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2798454Y (en) * | 2005-06-06 | 2006-07-19 | 海信集团有限公司 | Auxiliary electrical source circuit for hotel TV |
| CN201657160U (en) * | 2010-04-19 | 2010-11-24 | 深圳市龙欣实业有限公司 | Low-voltage output circuit of mobile television power supply |
| CN102801343A (en) * | 2011-05-25 | 2012-11-28 | 江苏兆能电子有限公司 | Synchronous rectifier drive signal generating line and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7532494B2 (en) * | 2005-05-24 | 2009-05-12 | Thomson Licensing | Power supply unit |
-
2013
- 2013-12-30 CN CN201310746979.2A patent/CN103715904B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2798454Y (en) * | 2005-06-06 | 2006-07-19 | 海信集团有限公司 | Auxiliary electrical source circuit for hotel TV |
| CN201657160U (en) * | 2010-04-19 | 2010-11-24 | 深圳市龙欣实业有限公司 | Low-voltage output circuit of mobile television power supply |
| CN102801343A (en) * | 2011-05-25 | 2012-11-28 | 江苏兆能电子有限公司 | Synchronous rectifier drive signal generating line and method |
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| Publication number | Publication date |
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| CN103715904A (en) | 2014-04-09 |
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