CN2681444Y - Stabilized voltage power supply circuit for switch - Google Patents
Stabilized voltage power supply circuit for switch Download PDFInfo
- Publication number
- CN2681444Y CN2681444Y CN 200320107737 CN200320107737U CN2681444Y CN 2681444 Y CN2681444 Y CN 2681444Y CN 200320107737 CN200320107737 CN 200320107737 CN 200320107737 U CN200320107737 U CN 200320107737U CN 2681444 Y CN2681444 Y CN 2681444Y
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- CN
- China
- Prior art keywords
- power supply
- switching power
- supply circuit
- output
- switch
- Prior art date
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- Expired - Fee Related
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- 238000004146 energy storage Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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Abstract
The utility model discloses a stabilized voltage power supply circuit for a switch. The power supply circuit for the switch satisfies the requirement of the small power consumption and the small volume of the liquid crystal television with advantages of simple structure and high efficiency. The utility model realizes the purpose of decreasing the ripple and stabilizing the output voltage through adopting one pulse width modulation switching power supply controller and matching with devices, such as a stored energy inductance, a follow current diode, etc. Normal operation of the liquid crystal television is greatly guaranteed. The stabilized voltage power supply circuit for the switch has a certain advancement of decreasing the damage to the components.
Description
Technical field
The utility model relates to a kind of switching power supply circuit, specifically, relates to a kind of switching power supply circuit that is used for liquid crystal TV set.
Background technology
D.C. regulated power supply can be divided into linear stabilized power supply and switching power supply two big classes usually, circuit is simple though linear stabilized power supply has, dynamic response is fast, interference and advantage such as ripple is little, voltage regulation performance is good, but, because the shortcoming that its efficient is low, volume is big and heavy is very inappropriate for wanting the LCD TV that cube is thin and little, power is high.And little, the lightweight characteristics of efficient height, the volume of Switching Power Supply just in time are applicable in the liquid crystal TV set.But present switch power source output voltage ripple is generally bigger, how to reduce ripple, guarantees that the stable output of DC power supply voltage is present urgent problem.
Summary of the invention
The utility model provides a kind of switching power supply circuit in order to overcome the bigger deficiency of the ripple of switch power source output voltage in the prior art, and this circuit structure is simple, and is with low cost, effectively suppressed ripple, has realized the stable output of direct voltage.
For solving the problems of the technologies described above, the utility model takes following technical scheme to be achieved:
A kind of switching power supply circuit includes a switching power source control circuit, can realize the conversion of direct voltage; Output at described switching power source control circuit is connected with an energy storage inductor, exports after the direct voltage after the switching power source control circuit conversion is by this energy storage inductor; In addition, also be connected with a fly-wheel diode between the output of described switching power source control circuit and ground, its negative pole links to each other plus earth with the output of switching power source control circuit.
In addition, between the output of energy storage inductor and ground, also be in series with filter capacitor; Above-mentioned switching power source control circuit has adopted a pulse-width modulation switching power supply controller, and its model is LM2576S.
Compared with prior art, the beneficial effects of the utility model are: this switching power supply circuit is by selecting a pulse-width modulation switching power supply controller for use, and cooperate devices such as energy storage inductor, fly-wheel diode, realize reducing the purpose of ripple, regulated output voltage, advantageously guaranteed the operate as normal of LCD TV.
Description of drawings
Fig. 1 is the physical circuit figure of the utility model switching power supply circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
The disclosed switching power supply circuit of the utility model has adopted the adjusting and voltage-reduction switch power supply, and the 12V direct voltage that external power source can be provided is converted to the 5V direct voltage, and its physical circuit is referring to shown in Figure 1.This switching power circuit mainly is made up of switch power controller N108, energy storage inductor L112, fly-wheel diode VD109, input filter capacitor C177, C179, C180 and output filter capacitor C178, C182～C184, C192.Wherein, described switch power controller N108 has adopted LM2576S type pulse-width modulation switching power supply controller, and its input VIN receives outside 12V power supply power supply through fuse F100, output 5V direct voltage after the internal circuit conversion; Output OUT one tunnel is through energy storage inductor L112 output 5V voltage, and one the tunnel through fly-wheel diode VD109 ground connection.
In addition, described output voltage one tunnel is through filter capacitor C178, C182～C184, C192 ground connection, alternating current component in the filtering direct voltage, one tunnel feedback end FB through switch power controller (hereinafter to be referred as controller) N108 turns back among the controller N108, realizes the rectification to output voltage.Its concrete course of work is as follows:
Outside 12V direct voltage is added to the input VIN of controller N108 after through fuse F100, filter capacitor C177, C179, C180 filtering, and fuse F100 plays a protective role when externally unusual the increasing appears in voltage and fuse.With the switch control end ON/OFF ground connection of controller N108, the state that controller N108 is in out always guarantees the switching power circuit continuous firing.
Controller N108 inside includes oscillator and pulse-width modulation comparator, can produce square-wave signal.During positive half cycle, make its internal transistor conducting, output OUT output 5V direct voltage by controller N108, fly-wheel diode VD109 is because of instead ending partially, electric current powers to the load by energy storage inductor L112, and simultaneously to each filter capacitor C178, C182～C184, C192 charging, at this moment, energy storage inductor L112 is in energy storage state (electric energy is converted to magnetic energy).When negative half period, internal transistor ends, the output OUT no-output of controller N108, and owing to the electric current of energy storage inductor L112 can not suddenly change, so its two ends just induce the negative right positive self-induced e.m.f in a left side, make fly-wheel diode VD109 conducting, at this moment, energy storage inductor L112 just is converted to electric energy to the magnetic energy of original storage, is continuously electric.
In addition, output+5V voltage also will turn back among the controller N108 through the feedback end FB of controller N108, pulse-width modulation comparator among the controller N108 compares itself and internal reference voltage, produce error signal, change the duty ratio of square wave, make output voltage keep stable, thereby realized the stable output of Switching Power Supply.
The utility model has been realized the stable output of Switching Power Supply by adopting said structure, has guaranteed the operate as normal of LCD TV.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (3)
1. a switching power supply circuit is characterized in that: include a switching power source control circuit in the described power circuit, can realize the conversion of direct voltage; Output at described switching power source control circuit is connected with an energy storage inductor, exports after the direct voltage after the described switching power source control circuit conversion is by this energy storage inductor; In addition, also be connected with a fly-wheel diode between the output of described switching power source control circuit and ground, its negative pole links to each other plus earth with the output of switching power source control circuit.
2. switching power supply circuit according to claim 1 is characterized in that: be in series with filter capacitor between the output of described energy storage inductor and ground.
3. switching power supply circuit according to claim 1 and 2 is characterized in that: described switching power source control circuit has adopted a pulse-width modulation switching power supply controller, and its model is LM2576S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320107737 CN2681444Y (en) | 2003-12-19 | 2003-12-19 | Stabilized voltage power supply circuit for switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320107737 CN2681444Y (en) | 2003-12-19 | 2003-12-19 | Stabilized voltage power supply circuit for switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2681444Y true CN2681444Y (en) | 2005-02-23 |
Family
ID=34599284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320107737 Expired - Fee Related CN2681444Y (en) | 2003-12-19 | 2003-12-19 | Stabilized voltage power supply circuit for switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2681444Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100446395C (en) * | 2007-04-28 | 2008-12-24 | 电子科技大学 | Regulated switching power supply with voltage ripple detection circuit |
| CN100527579C (en) * | 2006-08-07 | 2009-08-12 | 广鹏科技股份有限公司 | DC power conversion circuit with its own auxiliary voltage source and load fault protection |
| CN104767377A (en) * | 2015-04-23 | 2015-07-08 | 江苏博克斯自动化控制工程有限公司 | Small ripple wave direct current switching power source |
-
2003
- 2003-12-19 CN CN 200320107737 patent/CN2681444Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100527579C (en) * | 2006-08-07 | 2009-08-12 | 广鹏科技股份有限公司 | DC power conversion circuit with its own auxiliary voltage source and load fault protection |
| CN100446395C (en) * | 2007-04-28 | 2008-12-24 | 电子科技大学 | Regulated switching power supply with voltage ripple detection circuit |
| CN104767377A (en) * | 2015-04-23 | 2015-07-08 | 江苏博克斯自动化控制工程有限公司 | Small ripple wave direct current switching power source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |