CN104953839B - A kind of power supply circuit of stabilization - Google Patents
A kind of power supply circuit of stabilization Download PDFInfo
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- CN104953839B CN104953839B CN201410127315.2A CN201410127315A CN104953839B CN 104953839 B CN104953839 B CN 104953839B CN 201410127315 A CN201410127315 A CN 201410127315A CN 104953839 B CN104953839 B CN 104953839B
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Abstract
The present invention relates to a kind of power supply circuit of stabilization, the circuit includes input module, electricity-fetching module, power supply module and output module, the electricity-fetching module includes resonant inductance Ls and transformer T1, the resonant inductance Ls both ends are connected with input module and transformer T1 primary sides respectively, the transformer T1 secondary sides are connected with output module, and the power supply module is connected with resonant inductance Ls and transformer T1 respectively；The power supply module obtains voltage, and the Parallel opertation after over commutation from resonant inductance Ls and transformer T1 respectively.Compared with prior art, the present invention has the advantages that efficiency high, cost be low and energy-conserving and environment-protective.
Description
Technical field
The present invention relates to a kind of power supply circuit, more particularly, to a kind of power supply circuit of stabilization.
Background technology
At present in Switching Power Supply and LED driver, primary side and secondary side power supply are generally by one above transformer
Winding of powering provides, but the power supply of some constant current outputs and driver, because output voltage is very wide, such as LED driver one
As export the half that minimum load voltage is rated output voltage, and the VCC that we power couples with output voltage, brings
VCC change is very big, and the VCC to power is required to the voltage varied less, therefore can only typically increase in current supply circuit
Add the mu balanced circuit that one-level is linear, this mu balanced circuit brings many side effects, and the first VCC efficiency is very low, and the second increase is very
More auxiliary circuits, reliability reduce, and cost improves, and the 3rd when output voltage is lower, and due to VCC deficiency, power supply is still located
In guard mode, limitation will be still brought to output voltage range.The manufacturer of many manufacturers particularly LED driver at present,
In order to solve these problems, usually in the drive increase an accessory power supply, specially do power supply use, but cost can on
Rise, and because part increase much brings reliability decrease.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of efficiency high, cost are low
With the stable power-supplying circuit for being used for on-off circuit or LED driver primary side and secondary side power supply of energy-conserving and environment-protective.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of power supply circuit of stabilization, it is characterised in that the circuit include input module, electricity-fetching module, power supply module and
Output module, the electricity-fetching module include resonant inductance Ls and transformer T1, and the resonant inductance Ls both ends are respectively with inputting mould
Block is connected with transformer T1 primary sides, and the transformer T1 secondary sides are connected with output module, the power supply module respectively with it is humorous
The inductance Ls that shakes connects with transformer T1；
The power supply module obtains voltage, and the Parallel opertation after over commutation from resonant inductance Ls and transformer T1 respectively.
The power supply module includes the first power supply unit and the second power supply unit, when resonant inductance Ls is placed on transformer T1
When outer, first power supply unit and the second power supply unit have two windings, and one of winding is connected on transformer T1, separately
One winding is connected on resonant inductance Ls.
Output is the first supply voltage VCC after two winding loop parallel connections of first power supply unit, and described second supplies
Output is the second supply voltage VCC1 after two winding loop parallel connections of electric unit；
When output voltage Vout is in nominal operation section, the voltage obtained from winding at transformer T1 is as supply voltage
VCC and VCC1, when output voltage Vout is less than rated voltage section, the voltage obtained from winding at resonant inductance Ls is used as and supplied
Piezoelectric voltage VCC and VCC1, supply voltage VCC and VCC1 stabilization and independent of defeated during so as to accomplish that output voltage Vout is reduced
Go out voltage Vout change.
One end of two groups of windings of first power supply unit passes through respective diode D3, D4 and VCC output end respectively
Connection, the other end are connected by electric capacity C1 with VCC output ends；One end difference of two groups of windings of the second described power supply unit
Connected by respective diode D5, D6 and VCC1 output end, the other end is connected by electric capacity C2 with VCC1 output ends.
The output module includes two diodes D1, D2 and electric capacity Cout, described two diode D1, D2 anode difference
It is connected with transformer T1 secondary side winding, described two diode D1, D2 negative electrodes are connected with the electric capacity Cout other ends respectively, institute
It is output voltage Vout to state electric capacity Cout both end voltages.
The secondary side winding is made up of two windings, and two winding one end share, this share end respectively with electric capacity Cout,
Earth terminal is connected, and two winding other ends are connected with respective diode D1, D2 anode respectively.
When the resonant inductance Ls is built in transformer T1, first power supply unit and the second power supply unit only have one
Individual winding, and rotating around in a transformer T1 side channel；Winding one end of first power supply unit passes through diode D3
It is connected with the first supply voltage VCC output ends, the other end is connected by electric capacity C1 with the first supply voltage VCC output ends；It is described
Winding one end of second power supply unit is connected by diode D5 with the second supply voltage VCC1 output ends, and the other end passes through electric capacity
C2 is connected with the second supply voltage VCC1 output ends；Described electric capacity C2 one end is connected with the second supply voltage VCC1 output ends, separately
One end is connected with the earth terminal in output module.
Compared with prior art, the present invention has advantages below：
1) do not need extra accessory power supply and design very wide supply voltage.
2) it can provide change less power supply circuit in the case where meeting wide output voltage range.
3) efficiency is improved, reduces temperature rise, it is more energy efficient more environmentally friendly.
Brief description of the drawings
Fig. 1 is high-level schematic functional block diagram of the present invention；
Fig. 2 is the power supply plan that the present invention is provided resonant inductance external structure；
Fig. 3 is the transformer principle figure built in resonant inductance；
Fig. 4 provides resonant inductance embedding structure stable power supply plan for the present invention.
When Fig. 5 is resonant inductance embedding structure, secondary side power supply VCC1 winding coiling schematic diagram.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment 1
Herein to being described respectively with external built in the resonant inductance of LLC topologys.A kind of as shown in figure 1, confession of stabilization
Circuit, the circuit include input module 1, electricity-fetching module 2, power supply module 3 and output module 4, and electricity-fetching module 2 includes resonance electricity
Feel Ls and transformer T1, resonant inductance Ls both ends are connected with input module 1 and transformer T1 primary sides respectively, Circuit Fault on Secondary Transformer
It is connected with output module 4, power supply module 3 is connected with resonant inductance Ls and transformer T1 respectively；
Power supply module 3 obtains voltage from resonant inductance Ls and transformer respectively, and is taken transformer after rectifying and wave-filtering
T1 primary sides and secondary side power supply.
As shown in Fig. 2 the power supply module includes the first power supply unit and the second power supply unit, when resonant inductance Ls is external
When outside transformer T1, first power supply unit and the second power supply unit have two windings, and one of winding is connected on change
On depressor T1, another winding is connected on resonant inductance Ls.
Output is the first supply voltage VCC after two winding loop parallel connections of first power supply unit, and described second supplies
Output is the second supply voltage VCC1 after two winding loop parallel connections of electric unit；
When output voltage Vout is in nominal operation section, the voltage obtained from winding at transformer T1 is as supply voltage
VCC and VCC1, when output voltage Vout is less than rated voltage section, the voltage obtained from winding at resonant inductance Ls is used as and supplied
Piezoelectric voltage VCC and VCC1, supply voltage VCC and VCC1 stabilization and independent of defeated during so as to accomplish that output voltage Vout is reduced
Go out voltage Vout change.
One end of two groups of windings of first power supply unit passes through respective diode D3, D4 and VCC output end respectively
Connection, the other end are connected by electric capacity C1 with VCC output ends；One end difference of two groups of windings of the second described power supply unit
Connected by respective diode D5, D6 and VCC1 output end, the other end is connected by electric capacity C2 with VCC1 output ends.
LLC topologys have two resonant frequencies, and respectively fr1 and fr2. specific formula for calculation is as follows：
When the output voltage Vout of output module 4 is rated output, the working frequency fs set as fr2≤fs≤fr1, when
Working frequency falls at this section, and the operating voltage above resonant inductance Ls is than relatively low, and peak value is unstable, so powers
It is inappropriate, now does supply voltage with transformer T1 winding, that is, the electric current powered flows through from D3, D5.With output
The reduction of voltage, working frequency can gradually rise, and be exported with the electric current stablized, when working frequency fs is more than fr1, power supply
Winding voltage reduces with the reduction of output voltage, but Peak Operating Voltage is very stable on resonance Ls, supply voltage with
Now Ls voltages couple, i.e., supply current flows through from D4, D6, therefore doing two power supplies after the two windings respectively rectification parallel connection
With regard to that can meet that supply voltage changes independent of output voltage.
Output module 4 includes two diodes D1, D2 and electric capacity Cout, described two diode D1, D2 anodes respectively with
Transformer T1 secondary side winding connection, described two diode D1, D2 negative electrodes are connected with the electric capacity Cout other ends respectively, described
Electric capacity Cout both end voltages are output voltage Vout.The secondary side winding is made up of two windings, and two winding one end share,
This shares end and is connected respectively with electric capacity Cout, earth terminal, and two winding other ends connect with respective diode D1, D2 anode respectively
Connect.
Embodiment 2
It is illustrated in figure 3 the transformer T1 schematic diagrams built in resonant inductance Ls, it is known that Transformer Selection double-groove transformer, this
Invention is more convenient if for such a structure (built in resonant inductance Ls), this structure and the external area of resonant inductance above
Not, it is exactly rotating around in two grooves of skeleton (a public iron core), so the primary side of transformer and secondary side winding
The resonant inductance Ls needed for LLC is just naturally occurred between primary side and secondary side, it is only necessary to which power supply winding is wound on once
The effect of two winding (respectively on transformer and Ls) above-mentioned can be just completed in side channel, thus needs secondary side to supply
Electric VCC1 winding is also wound in first side winding groove (as shown in Figure 5).
As shown in figure 4, when the resonant inductance Ls is built in transformer T1, first power supply unit and the second power supply are single
Member only has a winding, and rotating around in a transformer T1 side channel；Winding one end of first power supply unit leads to
Cross diode D3 to be connected with the first supply voltage VCC output ends, the other end passes through electric capacity C1 and the first supply voltage VCC output ends
Connection；Winding one end of second power supply unit is connected by diode D5 with the second supply voltage VCC1 output ends, another
End is connected by electric capacity C2 with the second supply voltage VCC1 output ends；Described electric capacity C2 one end exports with the second supply voltage VCC1
End connection, the other end are connected with the earth terminal in output module.
Claims (5)
1. a kind of power supply circuit of stabilization, it is characterised in that the circuit includes input module, electricity-fetching module, power supply module and defeated
Go out module, the electricity-fetching module includes resonant inductance Ls and transformer T1, the resonant inductance Ls both ends respectively with input module
Connected with transformer T1 primary sides, the transformer T1 secondary sides are connected with output module, the power supply module respectively with resonance
Inductance Ls connects with transformer T1；
The power supply module obtains voltage, and the Parallel opertation after over commutation from resonant inductance Ls and transformer T1 respectively；
The power supply module includes the first power supply unit and the second power supply unit, when resonant inductance Ls is placed on outside transformer T1
When, first power supply unit and the second power supply unit have two windings, and one of winding is connected on transformer T1, another
Individual winding is connected on resonant inductance Ls；
Output is the first supply voltage VCC after two winding loop parallel connections of first power supply unit, and second power supply is single
Output is the second supply voltage VCC1 after two winding loop parallel connections of member；
When output voltage Vout is in nominal operation section, the voltage obtained from winding at transformer T1 is as supply voltage VCC
And VCC1, when output voltage Vout is less than rated voltage section, the voltage obtained from winding at resonant inductance Ls is used as power supply
Voltage VCC and VCC1, supply voltage VCC and VCC1 stabilization and independent of output during so as to accomplish that output voltage Vout is reduced
Voltage Vout change.
A kind of 2. power supply circuit of stabilization according to claim 1, it is characterised in that two groups of first power supply unit
One end of winding is connected by respective diode D3, D4 and VCC output end respectively, and the other end is defeated by electric capacity C1 and VCC
Go out end connection；One end of two groups of windings of the second described power supply unit is defeated by respective diode D5, D6 and VCC1 respectively
Go out end connection, the other end is connected by electric capacity C2 with VCC1 output ends.
3. the power supply circuit of a kind of stabilization according to claim 1, it is characterised in that the output module includes two two
Pole pipe D1, D2 and electric capacity Cout, secondary side winding of described two diode D1, D2 anodes respectively with transformer T1 are connected, institute
State two diode D1, D2 negative electrodes to be connected with the electric capacity Cout other ends respectively, the electric capacity Cout both end voltages are output voltage
Vout。
4. the power supply circuit for a kind of stabilization stated according to claim 3, it is characterised in that the secondary side winding is by two windings
Composition, two winding one end share, and this shares end and is connected respectively with electric capacity Cout, earth terminal, two winding other ends respectively with
Respective diode D1, D2 anode connection.
5. the power supply circuit of a kind of stabilization according to claim 3, it is characterised in that the resonant inductance Ls is built in change
During depressor T1, first power supply unit and the second power supply unit only have a winding, and rotating around the one of transformer T1
In secondary side channel；Winding one end of first power supply unit is connected by diode D3 with the first supply voltage VCC output ends, separately
One end is connected by electric capacity C1 with the first supply voltage VCC output ends；Winding one end of second power supply unit passes through two poles
Pipe D5 is connected with the second supply voltage VCC1 output ends, and the other end is connected by electric capacity C2 and the second supply voltage VCC1 output ends
Connect；Described electric capacity C2 one end is connected with the second supply voltage VCC1 output ends, and the other end is connected with the earth terminal in output module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127315.2A CN104953839B (en) | 2014-03-31 | 2014-03-31 | A kind of power supply circuit of stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127315.2A CN104953839B (en) | 2014-03-31 | 2014-03-31 | A kind of power supply circuit of stabilization |
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| Publication Number | Publication Date |
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| CN104953839A CN104953839A (en) | 2015-09-30 |
| CN104953839B true CN104953839B (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410127315.2A Active CN104953839B (en) | 2014-03-31 | 2014-03-31 | A kind of power supply circuit of stabilization |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245108A (en) * | 2015-10-26 | 2016-01-13 | 成都辰来科技有限公司 | Power supply circuit used for FPGA chip to prevent surge current interference |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621621A (en) * | 1993-01-25 | 1997-04-15 | Lindmark Electric Ab | Power unit having self-oscillating series resonance converter |
| US5999433A (en) * | 1998-01-12 | 1999-12-07 | Vpt, Inc. | Half-bridge DC to DC converter with low output current ripple |
| CN103391007A (en) * | 2012-05-07 | 2013-11-13 | 天网电子股份有限公司 | LLC series resonance converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3590153B2 (en) * | 1995-02-21 | 2004-11-17 | 東北リコー株式会社 | Switching power supply |
-
2014
- 2014-03-31 CN CN201410127315.2A patent/CN104953839B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621621A (en) * | 1993-01-25 | 1997-04-15 | Lindmark Electric Ab | Power unit having self-oscillating series resonance converter |
| US5999433A (en) * | 1998-01-12 | 1999-12-07 | Vpt, Inc. | Half-bridge DC to DC converter with low output current ripple |
| CN103391007A (en) * | 2012-05-07 | 2013-11-13 | 天网电子股份有限公司 | LLC series resonance converter |
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| CN104953839A (en) | 2015-09-30 |
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