CN201497920U - Voltage-stabilizing power supply circuit - Google Patents
Voltage-stabilizing power supply circuit Download PDFInfo
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- CN201497920U CN201497920U CN2009201923899U CN200920192389U CN201497920U CN 201497920 U CN201497920 U CN 201497920U CN 2009201923899 U CN2009201923899 U CN 2009201923899U CN 200920192389 U CN200920192389 U CN 200920192389U CN 201497920 U CN201497920 U CN 201497920U
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- voltage
- power supply
- voltage stabilizer
- supply circuit
- stabilizer
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Abstract
The utility model discloses a voltage-stabilizing power supply circuit which comprises a voltage stabilizer, a power supply input end of which is connected with a system power supply; and the voltage-stabilizing power supply circuit also comprises a voltage divider which is connected between the voltage stabilizer and the system power supply in series. The voltage-stabilizing power supply circuit can reduce the power consumption of the voltage stabilizer, ensures the work reliability and the service life of the voltage stabilizer, and has high quality output power supply.
Description
Technical field
The utility model 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 also claims IC, is widely used in the various electronic communication equipments.Because IC has polytype, and dissimilar IC has different operating voltage, therefore must be converted to the required operating voltage of IC by the supply voltage that voltage-stabilized power supply circuit provides in electronic communication equipment when using IC.
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 on the voltage stabilizer and output voltage in the above-mentioned voltage-stabilized power supply circuit, can cause the dissipated power of above-mentioned voltage stabilizer to become very big, produce a large amount of heats, 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.
The utility model content
The technical problems to be solved in the utility model 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.
The technical solution of the utility model is, a kind of power supply stabilization circuit is provided, and comprises voltage stabilizer, and the power input of described 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 utility model compared with prior art has the following advantages:
The utility model power supply stabilization circuit utilizes the partial pressure device work done, utilize voltage divider principle, reduced input voltage on the voltage stabilizer, make that the difference of input voltage and output voltage reduces on the voltage stabilizer, the power consumption that produces on voltage stabilizer reduces, heat reduces, make that the functional reliability and the serviceable life of voltage stabilizer are guaranteed, improved the quality of voltage stabilizer out-put supply simultaneously.
As improvement, partial pressure device of the present utility model 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 height, life-span are long.
Description of drawings
Accompanying drawing is the circuit theory diagrams of the utility model power supply stabilization circuit.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in drawings, in present embodiment, a kind of voltage-stabilized power supply circuit of the utility model, what input was adopted is the system voltage of 5V, voltage stabilizing output 3.3V voltage uses for integrated circuit (IC); A kind of voltage-stabilized power supply circuit of the utility model 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, the in parallel or series connection of described a plurality of resistance commonly used.In the present embodiment, employing is that R222, R223, these 3 resistance of R211 in parallel are connected with R154, R204, these 3 three resistance of R207 in parallel.R222, R223, R211 are SMD 2R7 08051/8W 5%; R154, R204, R207 are SMD 3R3 08051/8W 5%.
Be parallel with two filter capacitors of C100, C419 between power input 4 pin of described 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 described voltage stabilizer U37 and the digital grounding end DGND; Described C419, C659, C662 are ceramic condenser: specification is 10%, 10V, X7R, Murata:GCM31CR71A106KA64; Described 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 described 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 two electric capacity of C661, C659 between power output end 5 pin of described voltage stabilizer U37 and the analogue ground GND-ADSPS, be used for filtering.1 pin of described 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.
In the utility model: the input voltage after improving on the utility model voltage stabilizer U37 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 Dui Ying voltage stabilizer U37 is therewith: P=0.7*0.5A=0.35W.As seen the last dissipated power of voltage stabilizer U37 reduces greatly, and functional reliability strengthens, the life-span is longer.
Partial pressure device can also be a resistance in the utility model, and its resistance only needs identical with the resistance after R154, R204, these 3 three resistance of R207 in parallel 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 domain of the present utility model.
Claims (5)
1. a voltage-stabilized power supply circuit comprises voltage stabilizer, and the power input of described voltage stabilizer is connected with system power supply, it is characterized in that: it also comprises partial pressure device, and described partial pressure device is connected between voltage stabilizer and the system power supply.
2. voltage-stabilized power supply circuit according to claim 1 is characterized in that: described partial pressure device is a plurality of resistance commonly used, the in parallel or series connection of described a plurality of resistance commonly used.
3. voltage-stabilized power supply circuit according to claim 1 is characterized in that: be parallel with two electric capacity of C100, C419 between the power input of described voltage stabilizer and the analogue ground; Be parallel with two electric capacity of C662 and C276 between the power input of described voltage stabilizer and the digital grounding end; Be connected with magnetic bead between described analogue ground and the digital grounding end; The power input of the described voltage stabilizer inductance of also connecting, described inductance is connected with the power input of voltage stabilizer through partial pressure device.
4. voltage-stabilized power supply circuit according to claim 1 is characterized in that: be parallel with two electric capacity of C661, C659 between the power output end of described voltage stabilizer and the analogue ground.
5. 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 |
|---|---|---|---|
| CN2009201923899U CN201497920U (en) | 2009-08-18 | 2009-08-18 | Voltage-stabilizing power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201923899U CN201497920U (en) | 2009-08-18 | 2009-08-18 | Voltage-stabilizing power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201497920U true CN201497920U (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201923899U Expired - Lifetime CN201497920U (en) | 2009-08-18 | 2009-08-18 | Voltage-stabilizing power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639705B (en) * | 2009-08-18 | 2012-01-04 | 宁波和真汽车电子系统有限公司 | Voltage stabilizing power supply circuit |
-
2009
- 2009-08-18 CN CN2009201923899U patent/CN201497920U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639705B (en) * | 2009-08-18 | 2012-01-04 | 宁波和真汽车电子系统有限公司 | Voltage stabilizing power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100602 Effective date of abandoning: 20090818 |