CN201937460U - Stabilized voltage supply - Google Patents
Stabilized voltage supply Download PDFInfo
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- CN201937460U CN201937460U CN2010206564289U CN201020656428U CN201937460U CN 201937460 U CN201937460 U CN 201937460U CN 2010206564289 U CN2010206564289 U CN 2010206564289U CN 201020656428 U CN201020656428 U CN 201020656428U CN 201937460 U CN201937460 U CN 201937460U
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Abstract
The utility model provides a stabilized voltage supply, comprising a switch part, a sampling part, a feedback comparison control part, a PWM (Pulse-Width Modulation) control signal generation and amplification part, a constant flow source control part and an output filter part, wherein the sampling part is used for bearing a part of current output by the output filter part to obtain feedback voltage; the constant flow source control part is used for controlling current flowing through the sampling part; the feedback comparison control part is used for comparing the feedback voltage with reference voltage to generate a small-signal pulse signal; the PWM control signal generation and amplification part is used for modulating and then amplifying the small-signal pulse signal to obtain a PWM control signal; the switch part is used for carrying out pulse width modulation of input voltage under the control of the PWM control signal and then providing the modulated input voltage for the output filter part; and the output filter part is used for filtering and then outputting the pulse width-modulated voltage. The stabilized voltage supply reduces output voltage ripples.
Description
Technical field
The utility model relates to the circuit engineering field, in particular to a kind of stabilized voltage power supply.
Background technology
Structure based on the stabilized voltage power supply of sluggish pattern is generally: form the control winding and stablize needed actual voltage stabilizing output thereby the final output of stabilized voltage power supply feeds back to the FEEDBACK CONTROL end of power supply control chip after by electric resistance partial pressure.
The structure of its The whole control winding as shown in Figure 1, mainly adopted the transistor Q1 that is used for on-off action, be used to export PWM (Pulse Width Modulation, pulse-width modulation) power supply chip of switching pulse, the inductance L 1 and the capacitor C 2 that are used for the filtering voltage regulation of rear end output are used for divider resistance R1, the R2 etc. of sampling feedback.Control chip can not to make the The whole control loop produce vibration and a sluggish comparative voltage is provided in order to guarantee.Hysteresis voltage among Fig. 1 is equivalent to V
fWith V
RefMaximum difference.V
RefBe a steady state value, V
fCan change with the height of output voltage, so both have a difference.When this difference reached the hysteresis voltage value of control chip, control chip just had corresponding action to control actual output voltage V
OutSize, therefore also changed V
fSize, thereby guaranteed V
fValue approximate V
RefValue, also guaranteed V simultaneously
OutIt is the fixedly output voltage of a design.
The inventor finds usually to adopt passes through the stabilized voltage power supply that electric resistance partial pressure obtains the designed sluggish pattern of the control mode of sampling feedback voltage, the problem that exists the virtual voltage ripple to increase along with the increase of output voltage, this has limited its scope in practical application greatly.
The inventor thinks that the generation reason of this problem is based on hysteresis comparator of the interior existence of stabilized voltage power supply chip of sluggish pattern, if comparator hysteresis voltage is V
HYST, feedback voltage is V
f=V
Ref, stabilized voltage power supply is output as V
Out, know V according to Theoretical Calculation
OUTIn AC portion, i.e. actual output voltage ripple V
RIPPLECan be more than or equal to V
HYST* V
Out/ V
Ref
The utility model content
The utility model aims to provide a kind of stabilized voltage power supply, the problem that can increase along with the increase of output voltage with the output voltage ripple of the stabilized voltage power supply that solves prior art.
In embodiment of the present utility model, a kind of stabilized voltage power supply is provided, comprise: switch sections, sampling section, feedback ratio be than control section, pwm control signal generation and amplifier section, constant-current source control section, output filtering part, and sampling section is used to carry one part of current that output filtering partly exports to obtain feedback voltage; The constant-current source control section is used for the electric current of control flows over-sampling part; Feedback ratio is used for feedback voltage and reference voltage are compared than control section, to produce the small-signal pulse signal; Pwm control signal generates and amplifier section, is used for and will amplifies after the small-signal pulse signal modulation, thereby obtain pwm control signal; Switch sections is used under the control of pwm control signal with the pulse-width modulation of input voltage process, to offer output filtering part; Output filtering partly is used for exporting after the pwm voltage filtering.
The stabilized voltage power supply of present embodiment is because adopted the electric current of constant-current source control section control flows over-sampling part to obtain the feedback controling mode of sampled voltage, so overcome the problem that the output voltage ripple of prior art can increase along with the increase of output voltage, reached the effect that reduces the output voltage ripple.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows the circuit diagram of conventional stabilized voltage power supply;
Fig. 2 shows the schematic diagram according to the stabilized voltage power supply of an embodiment of the utility model;
Fig. 3 shows the circuit diagram according to the stabilized voltage power supply of a preferred embodiment of the utility model;
Fig. 4 shows the circuit diagram according to the stabilized voltage power supply of another preferred embodiment of the utility model.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Fig. 2 shows the schematic diagram according to the stabilized voltage power supply of an embodiment of the utility model, comprise: switch sections 10, sampling section 20, feedback ratio are than control section 30, pwm control signal generation and amplifier section 40, constant-current source control section 50, output filtering part 60, wherein, sampling section 20 is used to carry the one part of current of exporting 60 outputs of filtering part, and (this electric current is a control signal, the very little one part of current so only need sample, the electric current that output filtering is partly exported is a constant current) to obtain feedback voltage (this voltage is dynamic electric voltage); Constant-current source control section 20 is used for the electric current (this electric current is a constant current) of control flows over-sampling part 20; Feedback ratio is used for feedback voltage and reference voltage are compared than control section 30, to produce the small-signal pulse signal; Pwm control signal generates and amplifier section 40, is used for and will amplifies after the small-signal pulse signal modulation, thereby obtain pwm control signal; Switch sections 10 is used under the control of pwm control signal with the pulse-width modulation of input voltage process, to offer output filtering part 60; Output filtering part 60 is used for exporting after the pwm voltage filtering.
The stabilized voltage power supply of present embodiment is because adopt the electric current of constant-current source control section control flows over-sampling part to obtain the feedback controling mode of sampled voltage, so overcome the problem that the output voltage ripple of prior art can increase along with the increase of output voltage, reached the effect that reduces the output voltage ripple.
Fig. 3 shows the circuit diagram according to the stabilized voltage power supply of a preferred embodiment of the utility model.
Preferably, as shown in Figure 3, switch sections is a transistor Q1 as on-off action, for example adopts MOSFET (metal oxide semiconductor field effect tube), and its source electrode connects, its connection that drains, and its grid connects pwm control signal and generates and amplifier section.It is the MOSFET of FDC5614P that Q1 selects model in a preferred embodiment for use.
Preferably, as shown in Figure 3, output filtering partly comprises the inductor L1 and the capacitor C2 of series connection, and the input of inductor L1 connects the output of switch sections Q1, and the output head grounding of capacitor C2, capacitor C2 are used to carry the voltage V of output
Out, this circuit purpose is that the voltage signal of pulsation is smoothed to stable output level.
Preferably, as shown in Figure 3, sampling section comprises that first resistance R 1 of series connection and the input of second resistance R, 2, the first resistance R 1 connect the output of inductor L1 and the input of capacitor C2, the output head grounding of second resistance R 2.
Preferably, as shown in Figure 3, the constant-current source control section comprises an operational amplifier U1 and a triode Q2, the reverse input end of the emitter concatenation operation amplifier U1 of triode Q2 and the input of second resistance R 2, the collector electrode of triode Q2 connects the output of first resistance R 1, the output of the base stage concatenation operation amplifier U1 of triode Q2, the positive input of operational amplifier U1 connects burning voltage V
CThis can be converted to the stabling current that flows through load resistance to the burning voltage from the positive input of operational amplifier, so this voltage has also been controlled the size that flows into the stabling current of transistor collector end.It among Fig. 3 NPN type triode.Wherein, the electric current of constant-current source control section control flows over-sampling resistance R 1 obtains a controlled constant voltage and falls on sampling resistor R1, and this pressure drop adds the feedback voltage V of control chip
f(size of its value should equal the reference voltage V of control chip inside
Ref) can obtain actual output voltage V
Out
Preferably, as shown in Figure 3, stabilized voltage power supply also comprises a diode D1, its plus earth, and its negative electrode connects the input of inductor L1.
Preferably, as shown in Figure 2, stabilized voltage power supply also comprises input filtering part 70, is used for obtaining input voltage behind the voltage filter with input voltage source, offers switch sections 10.
Preferably, as shown in Figure 3, input filtering part 70 is a capacitor C1, and the one end connects input voltage source V
InWith switch sections Q1, other end ground connection.
As shown in Figure 3, described sampling section 20, feedback ratio generate than control section 30, pwm control signal and amplifier section 40 can add peripheral capacitance resistance and sampling resistor constitutes by a power supply control chip.It is actual that (positive input of hysteresis comparator is a benchmark source of stable pressure V through the reverse input end that feeds back to the hysteresis comparator in the power supply control chip after the constant pressure drop of filtered output voltage by sampling resistor R1
Ref), the pulse signal that comes modulation pulse generator to generate by the result of this comparator after relatively, and by obtaining being used for the pwm control signal (i.e. the pulse of figure output) of control switch part after amplifying.When actual output voltage is too high, after the sampling feedback voltage be higher than hysteresis comparator forward input voltage and hysteresis voltage and the time, power supply control chip cuts off the output of switch sections; When virtual voltage is crossed when low, when voltage is lower than hysteresis comparator forward input voltage value after the sampling feedback, power supply control chip output pwm control signal, switch sections is started working.Such negative feedback closed loop just can the actual output of automatic stabilisation voltage.
Input capacitance C1 is a storage capacitor, for back-end circuit and output provide electric energy.Switch sections such as Q1 are depicted as a MOSFET (metal oxide semiconductor field effect tube), and the electric energy that act as in the following storage capacitor of effect of grid impulse control voltage is given the rear end filter unit.It is the MOSFET of FDC5614P that Q1 selects model in the present embodiment for use, and the S utmost point (source electrode) connects the forward of C1 to be exported into end, and the D utmost point (drain electrode) connects the output filtering part of rear end, and its G utmost point (grid) is controlled by power supply chip.Exporting the filtering part as shown in Figure 3 is made of inductance L 1, output capacitance C2.Inductance L 1 serial connection switching tube and output capacitance C2 forward end.D1 is a fly-wheel diode as shown in Figure 2,
When switching tube turn-offed, the electric energy that stores in the inductance can continue by the afterflow of this diode to charge in output capacitance C2.The anode of D1 is connected to ground, and negative electrode is connected to the input of L1.
It mainly is to be on its control loop that the power supply of present embodiment is different from present usually the power supply of usefulness.Referring to Fig. 1, the sampling feedback part mainly is to be composed in series with divider resistance R1, R2, R3 in the power supply of the at present common usefulness control winding, and sampling voltage is V
F=V
OUT* R3/ (R1+R2+R3).Therefore under sluggish pattern according to calculating V
RIPPLE=V
HYST* (R1+R2+R3)/R3 knows that its ripple size is that power supply chip hysteresis voltage fixing doubly taken advantage of relation (multiplication factor is (R1+R2+R3)/R3).If when designing the circuit of high output voltage value more with same power supply chip, its factor becomes bigger, so its ripple also can rise along with rise of output voltage.
Referring to Fig. 3, the sampling feedback control section of the power supply of present embodiment is to realize by feedback resistance R1 under the effect of voltage controlled current source control.Wherein, the electric current of voltage controlled current source is I
E=V
C/ R
2, and I
C=I
E, the pressure drop that therefore can calculate the feedback resistance two ends is, and the magnitude of voltage that feeds back to power supply chip is
According to the close loop negative feedback stable condition as can be known: when stablizing, V
F=V
REFBecause
Be at R under the control of constant-current source
1Two ends obtain, so
Be a constant value, and V
FVariable quantity reflected is exactly V
OUTVariable quantity.Therefore under the control of this feedback arrangement, can realize: V
RIPPLE=V
HYST, the output ripple amplitude does not only have multiplication factor, but also does not increase with the increase of output voltage.
Referring to Fig. 3, the constant-current source control module in the present embodiment is made of operational amplifier U1, universal triode Q2 and precision resistance R2.The positive input of U1 is imported a voltage stabilizing V
C, reverse input end is connected to the node place that the emitter of Q2 is connected with R2, and the output of operational amplifier directly drives the base stage of Q2.This circuit also is to be a negative feedback closed loop structural circuit, can realize exporting high-precision constant current I
E=V
C/ R
2Because this is a constant-current source, so its internal resistance is want the sampling resistor R of series connection with it
1Be infinitely great, so voltage controlled current source can be ignored to the influence of feedback point.
Fig. 4 shows the circuit diagram according to the stabilized voltage power supply of another preferred embodiment of present embodiment.The preferred embodiment can change the voltage drop that the size that flows through the sample resistance electric current has also promptly changed the sample resistance two ends by the control voltage input of the voltage controlled current source in the control as shown in Figure 2.Present embodiment has increased the smart machine supervisory circuit on the basis of system as shown in Figure 3.The DAC control module of dotted portion and PWM output module and filtration module all can be realized the function of control output voltage size respectively as shown in the figure.The ADC module that increases is in order to realize the size of on-line monitoring actual output voltage value, and this road feedback can realize the size of secondary loop control actual output voltage value by MCU/FPGA module as shown in the figure.
Because the power supply virtual voltage output valve V of present embodiment
OUT=V
f+ V
R(wherein, V
OUTBe actual output voltage; V
FBe feedback voltage, this voltage equals the power supply reference voltage in degeneration factor; V
RBe the voltage drop on the sample resistance), so can change the size of actual output voltage value by the electric current that changes above-mentioned constant-current source.But all need online separately continuous timing in multichannel output and each road, adopt the circuit of this preferred embodiment can obtain good effect.
Because it is constant flowing through the electric current of sampling resistor, knows that according to ohm theorem V=I * R the voltage drop at sampling resistor two ends also is constant.Therefore, the size of the actual output end voltage fluctuation of stabilized power supply can fully be reflected in the feedback end of power supply control chip, this ripple amplitude does not only increase with the increase of actual output voltage amplitude, and only is slightly larger than the hysteresis voltage V of power supply control chip comparator under the situation of considering the loop hysteresis phenomenon
HYSTThis circuit has enlarged the application based on the stabilized voltage power supply of sluggish pattern.Owing to can control the size of power supply actual output voltage by the voltage of control voltage controlled current source, promptly control actual output voltage after therefore employing control appliance output digital signal converts voltage to by D/A in multichannel output and the continuously adjustable application system of the online single channel of every Lu Junxu.
In sum, the circuit structure in the utility model can realize that lower ripple and its amplitude do not increase with the rising of output voltage.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. a stabilized voltage power supply is characterized in that, comprising: switch sections, sampling section, feedback ratio be than control section, pwm control signal generation and amplifier section, constant-current source control section, output filtering part,
Described sampling section is used to carry one part of current that described output filtering partly exports to obtain feedback voltage;
Described constant-current source control section is used for the electric current that control flows is crossed described sampling section;
Described feedback ratio is used for described feedback voltage and reference voltage are compared than control section, to produce the small-signal pulse signal;
Described pwm control signal generates and amplifier section, is used for and will amplifies after the described small-signal pulse signal modulation, thereby obtain pwm control signal;
Described switch sections is used under the control of described pwm control signal with the pulse-width modulation of input voltage process, to offer described output filtering part;
Described output filtering partly is used for exporting after the described pwm voltage filtering.
2. stabilized voltage power supply according to claim 1 is characterized in that, described switch sections is a metal oxide semiconductor field effect tube, and its source electrode connects, its connection that drains, and its grid connects described pwm control signal and generates and amplifier section.
3. stabilized voltage power supply according to claim 1, it is characterized in that described output filtering partly comprises the inductor and the capacitor of series connection, the input of described inductor connects the output of described switch sections, the output head grounding of described capacitor, described capacitor is used to carry the voltage of output.
4. stabilized voltage power supply according to claim 3, it is characterized in that, described sampling section comprises first resistance and second resistance of series connection, and the input of described first resistance connects the output of described inductor and the input of described capacitor, the output head grounding of described second resistance.
5. stabilized voltage power supply according to claim 4, it is characterized in that, described constant-current source control section comprises an operational amplifier and a triode, the emitter of described triode connects the reverse input end of described operational amplifier and the input of described second resistance, the collector electrode of described triode connects the output of described first resistance, the base stage of described triode connects the output of described operational amplifier, and the positive input of described operational amplifier connects burning voltage.
6. stabilized voltage power supply according to claim 3 is characterized in that, also comprises a diode, its plus earth, and its negative electrode connects the input of described inductor.
7. stabilized voltage power supply according to claim 1 is characterized in that, also comprises input filtering part, is used for obtaining described input voltage behind the voltage filter with input voltage source, offers described switch sections.
8. stabilized voltage power supply according to claim 7 is characterized in that, described input filtering partly is a capacitor, and the one end connects described input voltage source and described switch sections, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206564289U CN201937460U (en) | 2010-12-07 | 2010-12-07 | Stabilized voltage supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206564289U CN201937460U (en) | 2010-12-07 | 2010-12-07 | Stabilized voltage supply |
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|---|---|
| CN201937460U true CN201937460U (en) | 2011-08-17 |
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| CN2010206564289U Expired - Fee Related CN201937460U (en) | 2010-12-07 | 2010-12-07 | Stabilized voltage supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545599A (en) * | 2010-12-07 | 2012-07-04 | 北大方正集团有限公司 | Switch voltage-stabilized power supply and voltage stabilizing method thereof |
| CN103414333A (en) * | 2013-07-05 | 2013-11-27 | 电子科技大学 | Active power factor correction controller |
| CN104882856A (en) * | 2015-05-25 | 2015-09-02 | 重庆大学 | High-precision over-current detection circuit |
-
2010
- 2010-12-07 CN CN2010206564289U patent/CN201937460U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545599A (en) * | 2010-12-07 | 2012-07-04 | 北大方正集团有限公司 | Switch voltage-stabilized power supply and voltage stabilizing method thereof |
| CN102545599B (en) * | 2010-12-07 | 2015-08-19 | 北大方正集团有限公司 | Switching power supply and method for stabilizing voltage thereof |
| CN103414333A (en) * | 2013-07-05 | 2013-11-27 | 电子科技大学 | Active power factor correction controller |
| CN103414333B (en) * | 2013-07-05 | 2015-10-21 | 电子科技大学 | A kind of active power factor correction controller |
| CN104882856A (en) * | 2015-05-25 | 2015-09-02 | 重庆大学 | High-precision over-current detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING UNIV. BEIDA FANGZHENG ELECTRONICS CO., LTD Free format text: FORMER OWNER: BEIJING UNIV. BEIJING FOUNDER DIGITAL PRINTING TECHNOLOGY CO., LTD. Effective date: 20120330 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120330 Address after: 100871 Beijing, Haidian District into the house road, founder of the building on the 5 floor, No. 298 Co-patentee after: Peking University Patentee after: Peking Founder Group Co., Ltd. Co-patentee after: Beida Fangzheng Electronics Co., Ltd., Beijing Address before: 100871 Beijing, Haidian District into the house road, founder of the building on the 5 floor, No. 298 Co-patentee before: Peking University Patentee before: Peking Founder Group Co., Ltd. Co-patentee before: Digital printing technology, Beijing Founder Electronics Co., Ltd. |
|
| 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: 20110817 Termination date: 20191207 |