CN205880722U - Power voltage stabilizing circuit that high ripple restraines - Google Patents
Power voltage stabilizing circuit that high ripple restraines Download PDFInfo
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- CN205880722U CN205880722U CN201620900702.XU CN201620900702U CN205880722U CN 205880722 U CN205880722 U CN 205880722U CN 201620900702 U CN201620900702 U CN 201620900702U CN 205880722 U CN205880722 U CN 205880722U
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- circuit
- voltage
- error amplifier
- power supply
- electric capacity
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Abstract
The utility model discloses a power voltage stabilizing circuit that high ripple restraines, including a power filter circuit, accurate reference circuit, voltage control network, the 3rd power filter circuit who establishes ties in proper order, set up feedback branch between voltage control network and the 3rd power filter circuit, the branch road is including the error amplifier circuit, PNP transistor circuit, the 2nd power filter circuit and the switch voltage stabilizing circuit that establish ties in proper order, the error amplifier circuit is connected with the voltage control network output end, switch voltage stabilizing circuit is connected with a power filter circuit input. The beneficial effects of the utility model are that: the utility model discloses even work is under ambient temperature on a large scale, still can obtain low temperature floats, the output voltage of high stability, efficient conversion can be realized under the very big condition of input/output pressure differential, the waste of electric flux is reduced as far as possible, through the error amplifier who chooses high power supply rejection ratio for use, be superior to the ripple inhibiting performance of ordinary linear stabilizer circuit.
Description
Technical field
This utility model relates to power supply voltage stabilizing field, the power supply stabilization circuit of a kind of high Ripple Suppression.
Background technology
At present, in numeral, radio frequency (RF) circuit design, the power supply voltage stabilizing chip that main use is integrated, defeated for input
Go out pressure reduction relatively big, generally select Switching Power Supply to carry out voltage stabilizing process, although Switching Power Supply conversion efficiency is high, can do buck, but
It is because its operation principle can produce the switching frequency of 20-200kHz, causes power path produces substantial amounts of ripple and noise, nothing
Method directly uses in RF circuit；In RF circuit, integrated linear voltage stabilization chip is generally selected to carry out power supply voltage stabilizing, because of integrated
Degree height, Ripple Suppression performance is general, and the voltage drop of integrated voltage-stabilized chip simultaneously relatively big (generally >=1V), in High-current output situation
Under, the power consumption of integrated regulated power supply self is relatively big, and power supply output stability is relatively low simultaneously.The present invention is by making up in above-mentioned background
Weak point and the power supply stabilization circuit of the high-efficiency high-precision of a kind of superelevation Ripple Suppression is provided.By insertion switch electricity
Source, band gap reference obtain the output voltage of high efficiency, high stability, are put by the error introducing high PSRR (PSRR)
Big device and distinctive electric source filter circuit obtain the Ripple Suppression performance of superelevation.
In all of integrated circuit, the performance of power supply stabilization circuit directly affects the service behaviour of integrated circuit.Cause
The output voltage precision of this power supply stabilization circuit, power supply ripple rejection, power supply conversion efficiency, output voltage range, output
The design that voltage stability etc. directly affects integrated circuit is good and bad.
The power supply stabilization circuit of present stage realizes the most in the following manner:
For the circuit that input and output pressure reduction is bigger, carry out blood pressure lowering process first by integrated switching power source chip, logical
Within being often depressured to more than output voltage 2V, process as one-level voltage stabilizing, because Switching Power Supply exports with substantial amounts of ripple
And noise, needing to carry out two grades of voltage stabilizings in rear end and process, integrated linear power supply chip is typically selected in two grades of voltage stabilizings.Integrated line
The Ripple Suppression performance of property power supply chip self is general, although ripple and noise signal for causing because of switching frequency have necessarily
Inhibitory action, but in RF circuit, even if carrying out two grades of voltage stabilizings through linear power supply, the ripple of its power path still can
Interfere between RF each several part circuit, the performance of radio circuit can be had a strong impact on.
If directly using linear power supply to carry out multistage voltage stabilizing process in the case of input and output pressure reduction is relatively big, although can
With the Ripple Suppression performance obtained, but being as exporting the increase of electric current, excessive pressure drop can be converted into heat, cause
Circuit efficiency is extremely low, seriously generates heat, and can directly result in circuit when of serious cannot normally work.
The circuit of less for input and output pressure reduction (within 3V), directly uses linear power supply voltage stabilizing chip to carry out one-level steady
Press.Because the precision of power supply is determined by the output accuracy of linear power supply in circuit, general circuit requirements can be met, but
When temperature range relatively wide (-25 DEG C～125 DEG C), output voltage is then susceptible to deviation, and the best reference voltage source sets
Meter directly determines output voltage precision and the temperature drift characteristic of power supply stabilization circuit.
Prior art mainly has a deficiency of following three aspects:
First: a large amount of ripples caused for switching frequency etc. and noise, common integrated linear regulated power supply ripple presses down
Performance processed is general, it is impossible to meet the demand of the circuit higher to Ripple Suppression requirement such as RF circuit；
Second: general power supply stabilization circuit, output voltage range is narrow, and is difficult to obtain bigger output electric current；
3rd: (temperature range is-25 DEG C～125 DEG C), integrated linear voltage stabilizing core in the case of temperature range is relatively wide
The output voltage of sheet can produce temperature drift along with the change of temperature, causes output voltage precision and the temperature stabilization of linear voltage stabilization chip
Property reduce.
Utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, it is provided that the power supply of a kind of high Ripple Suppression is steady
Volt circuit.
For achieving the above object, this utility model employing following technical proposals:
The power supply stabilization circuit of a kind of high Ripple Suppression, including the first electric source filter circuit being sequentially connected in series, Precision reference
Circuit, voltage-regulation network, the 3rd electric source filter circuit, arranged between described voltage-regulation network and the 3rd electric source filter circuit
Feedback branch, described feedback branch includes that the error amplifier circuit being sequentially connected in series, PNP transistor circuit, second source filter
Circuit and switch voltage-stabilizing circuit, described error amplifier circuit is connected with voltage-regulation network output, described switch voltage-stabilizing electricity
Road is connected with the first electric source filter circuit input.
Preferably, described first electric source filter circuit, second source filter circuit and the 3rd electric source filter circuit structure phase
With, including ferrite bean, the first electric capacity, the second electric capacity, described ferrite bean is connected with input voltage, described electric capacity one end
It is connected with ferrite bean, other end ground connection.
Preferably, described Precision reference circuit uses band gap reference.
Preferably, described voltage-regulation network includes the first resistance and the second resistance, described first resistance and Precision reference
Circuit output end connects, and described second resistance one end is connected with the first resistance, other end ground connection.
Described error amplifier circuit includes that error amplifier and the 4th electric capacity, described 4th electric capacity one end amplify with error
Device negative-phase input connects, and the other end is connected with error amplifier output；Described error amplifier negative-phase input connects the
Three electric capacity, the 3rd capacity earth.
Described PNP transistor circuit base stage is connected with error amplifier output, and colelctor electrode output is amplified with error respectively
Device normal phase input end, the 3rd electric source filter circuit input connect, and emitter stage is connected with second source filter circuit.
It is further preferred that described error amplifier uses the chip of high PSRR.Owing to PSRR is the biggest,
The output signal of error amplifier is the least on power-supply fluctuation impact, and the noise inhibiting ability then making whole circuit is the strongest.
Preferably, described PNP transistor circuit uses low saturation transistor.Owing to PNP pipe is in deep saturation, still
Can maintain stable output, described leakage voltage is less, i.e. leakage voltage Vdropout=VCE(sat) ≈ 0.15～0.4V, so protects
Even if card linear voltage-stabilizing circuit is in the case of big electric current, the quiescent dissipation of self is the lowest, has ensured the efficientibility of circuit.
It is more than or equal to the tantalum electric capacity of 20 μ F it is further preferred that described first electric capacity is capacitance, is less than for rejection frequency
Noise signal equal to 200kHz；Described second electric capacity is the ceramic dielectric electric capacity that capacitance is less than or equal to 0.1 μ F, for rejection frequency
Noise signal for MHz level；Described 3rd electric capacity carries out unrestricted choice according to the difference of noise signal；Described 4th electric capacity is for by mistake
The function integrating capacitor of difference amplifier, selects in actual application according to demand.
The beneficial effects of the utility model are:
1., even if this utility model works under a wide range of ambient, still can obtain Low Drift Temperature, high stability
Output voltage；
2. this utility model is in the case of input and output pressure reduction is very big, and this power supply stabilization circuit can also realize high efficiency
Conversion, reduce the waste of electric flux as far as possible；
3. this utility model is by selecting the error amplifier of high PSRR, obtains being better than normal linear mu balanced circuit
Ripple Suppression performance；
4. this utility model output voltage range is wider, can obtain bigger output electric current.
Accompanying drawing explanation
Fig. 1 is the power supply stabilization circuit figure of the high Ripple Suppression that this utility model provides；
Wherein 1. first electric source filter circuit, 2. Precision reference circuit, 3. voltage-regulation network, 4. error amplifier electricity
Road, 5.PNP transistor circuit, 6. second source filter circuit, 7. switch voltage-stabilizing circuit, 8. the 3rd electric source filter circuit.
Detailed description of the invention
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
As it is shown in figure 1, the power supply stabilization circuit of a kind of high Ripple Suppression, including the first electric source filter circuit being sequentially connected in series
1, Precision reference circuit 2, voltage-regulation network the 3, the 3rd electric source filter circuit 8, described voltage-regulation network 3 and the filter of the 3rd power supply
Arranging feedback branch between wave circuit 8, described feedback branch includes error amplifier circuit 4, the PNP transistor electricity being sequentially connected in series
Road 5, second source filter circuit 6 and switch voltage-stabilizing circuit 7, described error amplifier circuit 4 and voltage-regulation network 3 outfan
Connecting, described switch voltage-stabilizing circuit 7 is connected with the first electric source filter circuit 1 input.
Described first electric source filter circuit 1, second source filter circuit 6 are identical with the 3rd electric source filter circuit 8 structure, bag
Including ferrite bean L, the first electric capacity C1, the second electric capacity C2, described ferrite bean L is connected with input voltage, described electric capacity one
End is connected with ferrite bean L, other end ground connection.
Described Precision reference circuit 2 uses band gap reference.Described band gap reference according to the band gap voltage of silicon materials with
The characteristic that temperature is unrelated, utilizes Δ VEBPositive temperature coefficient and bipolar transistor VEBNegative temperature coefficient cancel out each other, it is achieved
Low Drift Temperature, precision voltage reference.Even if the reference voltage so obtained within the scope of the widest temperature it is also ensured that voltage
Output stability.
Described voltage-regulation network 3 includes the first resistance R1 and the second resistance R2, described resistance R1 and Precision reference circuit 2
Outfan connects, and described second resistance R2 one end is connected with the first resistance R1, other end ground connection.
Described error amplifier circuit includes error amplifier and the 4th electric capacity C4, described 4th electric capacity C4 one end and error
Amplifier negative-phase input connects, and the other end is connected with error amplifier output；Described error amplifier negative-phase input is even
Connect the 3rd electric capacity C3, the 3rd electric capacity C3 ground connection.
Described PNP transistor circuit 5 base stage is connected with error amplifier output, and colelctor electrode output is amplified with error respectively
Device normal phase input end, the 3rd electric source filter circuit 8 input connect, and emitter stage is connected with second source filter circuit 6.
Further, described error amplifier uses the chip of high PSRR.Owing to PSRR is the biggest, error is put
The output signal of big device is the least on power-supply fluctuation impact, and the noise inhibiting ability then making whole circuit is the strongest.
Described PNP transistor circuit 5 uses low saturation transistor.Owing to PNP pipe is in deep saturation, still can maintain
Stable output, described leakage voltage is less, i.e. Vdropout=VCE(sat) ≈ 0.15～0.4V, so ensures linear voltage-stabilizing circuit
Even if in the case of big electric current, the quiescent dissipation of self is the lowest, has ensured the efficientibility of circuit.
Further, described first capacitor's capacity uses the tantalum electric capacity more than or equal to 20 μ F, is less than or equal to for rejection frequency
The noise signal of 200kHz；Described second electric capacity uses the ceramic dielectric electric capacity less than or equal to 0.1 μ F, is MHz for rejection frequency
The noise signal of level；Described 3rd electric capacity carries out unrestricted choice according to the difference of noise signal；Described 4th electric capacity is that error is put
The function integrating capacitor of big device, selects in actual application according to demand.Because capacitance is the biggest, respective impedance is the least, corresponding
Filtering performance the best；And for the noise signal of MHz level, use a class ceramic dielectric electric capacity of low-capacitance to filter, ensure
The operating frequency of capacitor is far smaller than the resonant frequency of himself.
Described electric source filter circuit uses ferrite bean.Because its high-frequency loss is big, high resistivity, the spy of high magnetic permeability
Point, can suppress noise jamming in the widest frequency band range, select the ferrite bean of high impedance to carry out the ripple of power supply here
Suppression, finally gives the Ripple Suppression performance of superelevation.
Utility model works principle is as follows:
Input voltage VCCDivide two-way, lead up to after the first electric source filter circuit 1 filters and enter Precision reference circuit 2, produce
The accurate voltage of raw 10V, enters voltage-regulation network 3 afterwards and carries out dividing potential drop, and the output voltage obtaining wanting is sent into error and amplified
The negative-phase input of circuit 4；VCCThe second tunnel access switch mu balanced circuit 7 carry out blood pressure lowering and obtain VE, enter power filter afterwards
Circuit 6 carries out Ripple Suppression, subsequently into the emitter stage of PNP transistor circuit 5；Resistance is passed through in the output of error amplifying circuit 4
Connect the base stage of PNP low saturation transistor 5；The colelctor electrode output of PNP transistor 5 is divided into two-way, and a road is as feedback signal
Send into the normal phase input end of error amplifier, as the feedback signal of power supply stabilization circuit, by carrying out with negative output voltage
Relatively, utilizing " empty short " of error amplifier and the error amplification characteristic to two input signals, the outfan of error amplifier leads to
The break-make overregulating PNP pipe adjusts colelctor electrode output voltage VC, final system stably after, output voltage equal to through overvoltage adjust
The voltage that joint network 3 obtains after carrying out dividing potential drop；The 3rd electric source filter circuit 8 of additionally leading up to of PNP transistor 5 carries out ripple
Export after suppression, finally give low noise, highly purified output voltage.It addition, as input voltage VCCWith output voltage VOUTDifference
Time within 0.3V～3V, switch voltage-stabilizing circuit 7 directly can be removed, by VCCIt is sent directly into this power supply degeneration factor to carry out
Voltage stabilizing exports.
The output electric current of final power supply is by the maximum output current I of PNP transistor 5CAnd the maximum of switch voltage-stabilizing circuit 7
Output electric current determines, and general PNP low saturation transistor output current is greater than switching power source chip；This practicality final is new
The power supply stabilization circuit that type provides, can be at VCCIn the case of >=12V, through power supply voltage stabilizing degeneration factor, finally give defeated
Go out the high efficiency of any voltage value, big electric current, high-purity, the voltage source of low noise in voltage 3V-10V.
By above-mentioned operation principle, on the one hand, this utility model introduces band gap reference and voltage-regulation network, protect
The Low Drift Temperature of output voltage, high stability and high-precision characteristic are demonstrate,proved；On the other hand, this utility model is in input and output pressure
In the case of difference is relatively big, carries out one-level voltage stabilizing by insertion switch mu balanced circuit, be simultaneously introduced PNP transistor so that whole power supply
The power supply conversion efficiency of mu balanced circuit is high, it addition, by selecting the error amplifier that PSRR is bigger, exportable high-purity
Degree, the voltage of low noise.
Although detailed description of the invention of the present utility model is described by the above-mentioned accompanying drawing that combines, but not new to this practicality
The restriction of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability
Field technique personnel need not to pay various amendments or deformation that creative work can make still at protection model of the present utility model
Within enclosing.
Claims (8)
1. a power supply stabilization circuit for high Ripple Suppression, is characterized in that, including the first electric source filter circuit being sequentially connected in series, essence
Close reference circuit, voltage-regulation network, the 3rd electric source filter circuit, described voltage-regulation network and the 3rd electric source filter circuit it
Between feedback branch is set, error amplifier circuit that described feedback branch includes being sequentially connected in series, PNP transistor circuit, the second electricity
Power filter and switch voltage-stabilizing circuit, described error amplifier circuit is connected with voltage-regulation network output, described switch
Mu balanced circuit and the first electric source filter circuit input connect.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 1, is characterized in that, described first power filter electricity
Road, second source filter circuit and the 3rd electric source filter circuit structure are identical, including ferrite bean, the first electric capacity, the second electricity
Holding, described ferrite bean is connected with input voltage, and described electric capacity one end is connected with ferrite bean, other end ground connection.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 2, is characterized in that, described Precision reference circuit uses
Band gap reference.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 3, is characterized in that, described voltage-regulation network includes
First resistance and the second resistance, described resistance is connected with Precision reference circuit output end, described second resistance one end and the first electricity
Resistance connects, other end ground connection.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 2, is characterized in that, described error amplifier circuit bag
Including error amplifier and the 4th electric capacity, described 4th electric capacity one end is connected with error amplifier negative-phase input, the other end and mistake
Difference amplifier out connects；Described error amplifier negative-phase input connects the 3rd electric capacity, the 3rd capacity earth；
Described PNP transistor circuit base stage is connected with error amplifier output, and colelctor electrode respectively with error amplifier is just exporting
Phase input, the 3rd electric source filter circuit input connect, and emitter stage is connected with second source filter circuit.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 5, is characterized in that, described error amplifier uses height
The chip of PSRR.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 5, is characterized in that, described PNP transistor circuit is adopted
Use low saturation transistor.
The power supply stabilization circuit of high Ripple Suppression the most as claimed in claim 5, is characterized in that, described first electric capacity is that capacitance is big
In the tantalum electric capacity equal to 20 μ F, for the rejection frequency noise signal less than or equal to 200kHz；Described second electric capacity is that capacitance is little
In the ceramic dielectric electric capacity equal to 0.1 μ F, for the noise signal that rejection frequency is MHz level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620900702.XU CN205880722U (en) | 2016-08-17 | 2016-08-17 | Power voltage stabilizing circuit that high ripple restraines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620900702.XU CN205880722U (en) | 2016-08-17 | 2016-08-17 | Power voltage stabilizing circuit that high ripple restraines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205880722U true CN205880722U (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620900702.XU Expired - Fee Related CN205880722U (en) | 2016-08-17 | 2016-08-17 | Power voltage stabilizing circuit that high ripple restraines |
Country Status (1)
| Country | Link |
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| CN (1) | CN205880722U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957288A (en) * | 2018-06-11 | 2018-12-07 | 南京尤尼泰信息科技有限公司 | A kind of test substrate suitable for plurality of specifications crystal oscillator |
-
2016
- 2016-08-17 CN CN201620900702.XU patent/CN205880722U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957288A (en) * | 2018-06-11 | 2018-12-07 | 南京尤尼泰信息科技有限公司 | A kind of test substrate suitable for plurality of specifications crystal oscillator |
| CN108957288B (en) * | 2018-06-11 | 2023-10-13 | 南京尤尼泰信息科技有限公司 | Test substrate suitable for multiple specification crystal oscillator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190220 Address after: 266555 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 266555 No. 98 Xiangjiang Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: The 41st Institute of CETC |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20180817 |