CN101639705B - Voltage stabilizing power supply circuit - Google Patents
Voltage stabilizing power supply circuit Download PDFInfo
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- CN101639705B CN101639705B CN2009101019131A CN200910101913A CN101639705B CN 101639705 B CN101639705 B CN 101639705B CN 2009101019131 A CN2009101019131 A CN 2009101019131A CN 200910101913 A CN200910101913 A CN 200910101913A CN 101639705 B CN101639705 B CN 101639705B
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- voltage stabilizer
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Abstract
The invention discloses a voltage stabilizing power supply circuit which comprises a voltage stabilizer, wherein the power supply input end of the voltage stabilizer is connected with a system power supply. The voltage stabilizing power supply circuit also comprises a voltage partitioning device, wherein the voltage partitioning device is connected in series between the voltage stabilizer and the system power supply. The voltage stabilizing power supply circuit can reduce the power consumption on the voltage stabilizer so as to ensure the working reliability and the service life of the voltage stabilizer and have high output power supply quality.
Description
Technical field
The present invention relates to a kind of power circuit for integrated circuit block power supply usefulness, specifically is a kind of big electric current, the low voltage-stabilized power supply circuit that falls.
Background technology
Integrated circuit is also claimed IC, is widely used in the various electronic communication equipments.Because IC has polytype, and dissimilar IC has different operating voltages, therefore when using IC, must convert the required WV of IC into through the supply voltage that voltage-stabilized power supply circuit provides in electronic communication equipment.
The voltage-stabilized power supply circuit of prior art is a high-current low-voltage difference voltage stabilizer (also claiming LDO), and the power input of this voltage stabilizer is connected with the output terminal of system power supply during use, and its power output end is connected with the power input of IC.Because the working current of this circuit is bigger; If it is bigger to act on the difference of input voltage and output voltage on the voltage stabilizer in the above-mentioned voltage-stabilized power supply circuit; Can cause the dissipated power of above-mentioned voltage stabilizer to become very big; Produce great amount of heat, make the working temperature of voltage stabilizer raise, so not only can influence this voltage stabilizer functional reliability, influence serviceable life of this voltage stabilizer; And can seriously influence the quality of this voltage stabilizer out-put supply, the just quality of prior art voltage-stabilized power supply circuit out-put supply.
Summary of the invention
The technical matters that the present invention will solve is, overcomes the defective of above prior art, and a kind of power supply stabilization circuit that reduces power attenuation on the voltage stabilizer is provided.
Technical scheme of the present invention is, a kind of power supply stabilization circuit is provided, and comprises voltage stabilizer, and the power input of said voltage stabilizer is connected with system power supply, and it also comprises partial pressure device, and described partial pressure device is connected between voltage stabilizer and the system power supply.
After adopting above structure, the present invention compared with prior art has the following advantages:
Power supply stabilization circuit of the present invention utilizes the partial pressure device work done; Utilize voltage divider principle; Reduced input voltage on the voltage stabilizer, made that the difference of input voltage and output voltage reduces on the voltage stabilizer, the power consumption that on voltage stabilizer, produces reduces, heat reduces; Make voltage stabilizer functional reliability and be able to serviceable life guarantee, improved the quality of voltage stabilizer out-put supply simultaneously.
As improvement, partial pressure device of the present invention is the resistance commonly used of a plurality of serial or parallel connections, and not only cost is low, and simple in structure, and functional reliability is high, the life-span is long.
Description of drawings
Accompanying drawing is the circuit theory diagrams of power supply stabilization circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
Shown in accompanying drawing, in present embodiment, a kind of voltage-stabilized power supply circuit of the present invention, what input was adopted is the system voltage of 5V, voltage stabilizing output 3.3V voltage supplies IC to use; A kind of voltage-stabilized power supply circuit of the present invention comprises voltage stabilizer U37, and promptly our common LDO falls voltage stabilizing IC for big electric current is low, and the employing model is S-1172B33-U5T1G, and this is the LDO Regulator of Seiko electronics, and it is encapsulated as: SOT-89-5; It also comprises partial pressure device, and described partial pressure device is connected between voltage stabilizer U37 and the system power supply.
Described partial pressure device is a plurality of resistance commonly used, described a plurality of resistance parallel connections commonly used or series connection.In the present embodiment, employing is that parallelly connected R222, R223, these 3 resistance of R211 are connected with R154, R204, these 3 three resistance of R207 of parallel connection.R222, R223, R211 are SMD 2R7 0805 1/8W 5%; R154, R204, R207 are SMD 3R3 08051/8W 5%.
Be parallel with C100, two filter capacitors of C419 between power input 4 pin of said voltage stabilizer U37 and the analogue ground GND-ADSPS; Be parallel with C662 and two filter capacitors of C276 between power input 4 pin of said voltage stabilizer U37 and the digital grounding end DGND; Described C419, C659, C662 are ceramic condenser: specification is 10%, 10V, X7R, Murata:GCM31CR71A106KA64; Said capacitor C 100/C276/C661 is similarly ceramic condenser, specification: 10%, and 16V, X7R, Murata:GCM188R71C104KA37D; Be connected with magnetic bead L1 between described analogue ground GND-ADSPS and the digital grounding end DGND, specification is 600R/100MHZ, MuRata:BLM18HD601SN1; The power input of the said voltage stabilizer U37 inductance L 40 of also connecting, specification is: 6uH 1A-/+30%, TDK:VLCF4020T-6R8N1R0; Described inductance L 40 is connected with power input 4 pin of voltage stabilizer U37 behind above-mentioned partial pressure device.
Be parallel with C661, two electric capacity of C659 between power output end 5 pin of said voltage stabilizer U37 and the analogue ground GND-ADSPS, be used for filtering.1 pin of said voltage stabilizer U37 is the ON/OFF control input pin of chip, system's control level of input 3V3/0V.
The power consumption on voltage stabilizer U37 of prior art, the input voltage of this voltage stabilizer U37 is 5V, and output voltage is 3.3V, and the operate as normal load current is about 500mA, and the dissipated power of this power supply IC is: P=(5-3.3) V*0.5A=0.85W.
Among the present invention: the input voltage after improving on the voltage stabilizer U37 of the present invention and the difference of output voltage are: Δ V=(5-3.3) V-(3.3/3+2.7/3) * 0.5A=0.7V, the dissipated power on the corresponding therewith voltage stabilizer U37 is: P=0.7*0.5A=0.35W.Reduce greatly it is thus clear that voltage stabilizer U37 goes up dissipated power, functional reliability strengthens, the life-span is longer.
Partial pressure device can also be a resistance among the present invention, and its resistance only needs identical with the resistance after R154, R204, these 3 three resistance of R207 of parallel connection connects with R222, R223, these 3 resistance of R211 of parallel connection and power satisfies accordingly that requirement gets final product; This is also in protection scope of the present invention.
Claims (3)
1. a voltage-stabilized power supply circuit comprises voltage stabilizer, and the power input of said voltage stabilizer is connected with system power supply, it is characterized in that: described voltage-stabilized power supply circuit also comprises partial pressure device, and described partial pressure device is connected between voltage stabilizer and the system power supply; Described partial pressure device is a plurality of resistance, described a plurality of resistance parallel connections or series connection; Be connected with an inductance L 40 between described system power supply and the partial pressure device; Be provided with two capacitor C 662 and C276 between described inductance L 40 and the partial pressure device, an end of said capacitor C 662 and capacitor C 276 all is connected with inductance L 40 and partial pressure device, and the other end of said capacitor C 662 and capacitor C 276 all is connected with the digital grounding end; Be provided with two capacitor C 100 and C419 between said partial pressure device and the voltage stabilizer, an end of said capacitor C 100 and capacitor C 419 all is connected with voltage stabilizer and partial pressure device, and the other end of said capacitor C 100 and capacitor C 419 all is connected with analogue ground; Be connected with magnetic bead L1 between described analogue ground and the digital grounding end.
2. voltage-stabilized power supply circuit according to claim 1 is characterized in that: be parallel with C661, two electric capacity of C659 between the power output end of said voltage stabilizer and the analogue ground.
3. voltage-stabilized power supply circuit according to claim 1 is characterized in that: described voltage stabilizer is the low voltage stabilizer that falls of big electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101019131A CN101639705B (en) | 2009-08-18 | 2009-08-18 | Voltage stabilizing power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101019131A CN101639705B (en) | 2009-08-18 | 2009-08-18 | Voltage stabilizing power supply circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN101639705A CN101639705A (en) | 2010-02-03 |
| CN101639705B true CN101639705B (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101019131A Active CN101639705B (en) | 2009-08-18 | 2009-08-18 | Voltage stabilizing power supply circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200965646Y (en) * | 2006-06-02 | 2007-10-24 | 中兴通讯股份有限公司 | A circuit for reducing the power consumption of low voltage drop regulator |
| CN201497920U (en) * | 2009-08-18 | 2010-06-02 | 宁波和真汽车电子系统有限公司 | Voltage-stabilizing power supply circuit |
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2009
- 2009-08-18 CN CN2009101019131A patent/CN101639705B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200965646Y (en) * | 2006-06-02 | 2007-10-24 | 中兴通讯股份有限公司 | A circuit for reducing the power consumption of low voltage drop regulator |
| CN201497920U (en) * | 2009-08-18 | 2010-06-02 | 宁波和真汽车电子系统有限公司 | Voltage-stabilizing power supply circuit |
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| CN101639705A (en) | 2010-02-03 |
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Effective date of registration: 20181012 Address after: 315000 building 4, Jinshan Road, Jiangbei District, Ningbo, Zhejiang, China, 228 Patentee after: Ningbo Feng Mei Video Electronics Co.,Ltd. Address before: 315700 Industrial Zone, Xizhou Town, Xiangshan County, Zhejiang Patentee before: NINGBO HEZHEN AUTO ELECTRIC SYSTEM Co.,Ltd. |
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Address after: 315000 building 4, Jinshan Road, Jiangbei District, Ningbo, Zhejiang, China, 228 Patentee after: Ningbo Huaxiang Video Electronics Co.,Ltd. Address before: 315000 building 4, Jinshan Road, Jiangbei District, Ningbo, Zhejiang, China, 228 Patentee before: Ningbo Feng Mei Video Electronics Co.,Ltd. |