CN202159282U - Micro dropout linear voltage stabilization power supply circuit - Google Patents
Micro dropout linear voltage stabilization power supply circuit Download PDFInfo
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- CN202159282U CN202159282U CN201120136331XU CN201120136331U CN202159282U CN 202159282 U CN202159282 U CN 202159282U CN 201120136331X U CN201120136331X U CN 201120136331XU CN 201120136331 U CN201120136331 U CN 201120136331U CN 202159282 U CN202159282 U CN 202159282U
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Abstract
The utility model discloses a micro dropout linear voltage stabilization power supply circuit, which at least comprises a first path output and a second path output, and output voltage of the first path output is higher than output voltage of the second path output. The power supply circuit comprises an auxiliary power supply, a driving circuit, a feedback circuit and a power adjustment component. A positive end of the second path output is coupled with the input end of the feedback circuit, the output end of the feedback circuit is coupled with the control end of the driving circuit, the input end of the driving circuit is coupled with the positive end of the first path output of the auxiliary power supply, the output end of the driving circuit is coupled with the control end of the power adjustment component, and the output end of the power adjustment component is coupled with the positive end of the second path output. The driving circuit converts output signals of auxiliary voltage into signals controlling the power adjustment component to output according to output of the feedback circuit to achieve micro dropout output. Output short-circuit protection can be achieved by further arranging a short-circuit protection circuit.
Description
Technical field
The utility model relates to power-supply device, particularly relates to a kind of minute-pressure difference linear voltage-stabilized power supply circuit.
Background technology
After general two groups of Switching Power Supplies adopt secondary commutation filtering, directly export to system's power supply to voltage, because the characteristic of Switching Power Supply; When system load was uneven, the two-way of Switching Power Supply common transformer or multichannel output voltage intersection were drawn the bound of voltage meeting offset criteria value when carrying, and for example one tunnel load is minimum; When other one tunnel load is maximum; Two groups of voltages can produce drift, and load is the upper limit that minimum one tunnel voltage can exceed standard, and load is that maximum one tunnel voltage can substandard lower limit; The operating voltage range that exceeds system, causes system can't operate as normal.For addressing this problem two kinds of schemes are arranged usually: one, increase a three terminal regulator on that little road of output current; More than the minimum 2V of the pressure reduction at general three terminal regulator two ends; For guaranteeing stable output voltage, the pressure reduction at three terminal regulator two ends will be more than 3-4V.The power consumption of three terminal regulator itself just very big (is that example calculating just has the 3-4W loss with 1A) so just must be used very big heating radiator like this, has not only increased cost but also strengthened the space.Two, adopt the DC-DC scheme to convert high voltage to low-voltage little electric current, 1A for example, it works on off state, and high frequency interference is very big, and needing increases the EMI element, will increase cost so, and the DC-DC chip of 1A is also somewhat expensive in addition.
The utility model content
The fundamental purpose of the utility model is exactly the deficiency to prior art, and a kind of high-efficiency and low-cost minute-pressure difference linear voltage-stabilized power supply circuit is provided.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of minute-pressure difference linear voltage-stabilized power supply circuit; Has the first via output at least and the second tunnel output; The output voltage of said first via output is higher than the output voltage of said the second tunnel output; Said power circuit comprises auxilliary help electric source ﹑ driving circuit, feedback circuit and power adjustments device; The anode of said the second tunnel output is coupled to the input end of said feedback circuit, and the output terminal of said feedback circuit is coupled to the control end of said driving circuit, and the input end of said driving circuit is coupled to the anode as the said first via output of said accessory power supply; The output terminal of said driving circuit is coupled to the control end of said power adjustments device, and the output terminal of said power adjustments device is coupled to the anode of said the second tunnel output.
Embodiment preferred:
Said power adjustments device is first triode, and said first triode provides said the second tunnel output by its collector-emitter.
Said first triode is the NPN triode.
Said driving circuit comprises second triode; Said accessory power supply is coupled to the collector of said second triode through first resistance; And be coupled to the base stage of said second triode through second resistance; The emitter-coupled of said second triode arrives the control end of said power adjustments device, and is coupled to the negative terminal of said the second tunnel output through the 3rd resistance, and the base stage of said second triode is coupled to the output terminal of said feedback circuit.
Said power circuit also comprises short-circuit protection circuit, and the input end of said short-circuit protection circuit is coupled to the anode of said the second tunnel output, and the output terminal of said short-circuit protection circuit is coupled to the base stage of said second triode.
Said short-circuit protection circuit comprises the 3rd triode and the 4th triode; The anode of said first via output is coupled to the emitter of said the 3rd triode and an end of first electric capacity through first divider resistance; And through the second divider resistance ground connection, the base stage of said the 3rd triode of another termination of said first electric capacity, and be coupled to the anode of said the second tunnel output through the 4th resistance; The collector of said the 3rd triode connects the base stage of said the 4th triode; And through the 5th resistance eutral grounding, the grounded emitter of said the 4th triode, the collector of said the 4th triode connects the base stage of the output terminal and said second triode of said feedback circuit.
Said the 3rd triode is the PNP triode, and said the 4th triode is the NPN triode.
Said feedback circuit comprises the reference voltage controller; The anode of said the second tunnel output is coupled to the sampling end of said reference voltage controller through the 3rd divider resistance; And through the 4th divider resistance ground connection, the output terminal of said reference voltage controller is coupled to the said control end that is coupled to said driving circuit.
Said feedback circuit also comprises the sampling end that is connected in parallel on said reference voltage controller and the compensating circuit between the output terminal, and said compensating circuit comprises the 6th resistance and the 3rd electric capacity that is in series.
The utility model beneficial technical effects is:
Compare prior art; The minute-pressure difference linear voltage-stabilized power supply circuit of the utility model can fine solution two-way or multi-output switch power source draw the voltage drift when carrying in intersection; Thereby guaranteeing that every group of voltage of Switching Power Supply is independent separately works reliably, and realizes that cost is very low.Adopt the output of the Switching Power Supply power supply realization minute-pressure difference of the utility model, its most effective reaching more than 95%.
Further, the power adjustments device adopts triode, because the pressure reduction at power adjustments device collector-emitter two ends is very little, so only need smaller radiator heat-dissipation just passable.In addition, because the manufacturing process of triode is very ripe at present, the price of triode is very cheap, and cost is just lower so.
Further, increase short-circuit protection circuit, solved the problem of linear voltage-stabilized power supply circuit output short circuit protection, protected the power adjustments device.
Description of drawings
Fig. 1 is the block diagram of a Switching Power Supply of the minute-pressure difference linear voltage-stabilized power supply circuit of employing the utility model embodiment;
Fig. 2 is the circuit block diagram of the minute-pressure difference linear voltage-stabilized power supply circuit of an embodiment of the utility model;
Fig. 3 is the concrete circuit theory diagrams of minute-pressure difference linear voltage-stabilized power supply circuit of a preferred embodiment of the utility model.
Embodiment
Below combine accompanying drawing that the utility model is further specified through embodiment.
See also Fig. 1, a Switching Power Supply comprises main circuit and minute-pressure difference linear voltage-stabilized power supply circuit, main circuit have first via output+VH OUT ,-VH OUT and the second tunnel output+VL OUT ,-VL OUT.In one embodiment, minute-pressure difference linear voltage-stabilized power supply circuit comprises power adjustments device Q2, accessory power supply+VH OUT, feedback circuit and driving circuit.
As depicted in figs. 1 and 2; In one embodiment; Output voltage+VH the OUT of first via output is higher than the output voltage+VL OUT of the second tunnel output; The anode of the second tunnel output is coupled to the input end of feedback circuit, and the output terminal of feedback circuit is coupled to the control end of driving circuit, and the input end of driving circuit is coupled to the anode as the first via output of accessory power supply; The output terminal of driving circuit is coupled to the control end of power adjustments device; The output terminal of power adjustments device is coupled to the anode of the second tunnel output, and driving circuit is according to the output of feedback circuit, and the signal that the output conversion of signals of boosting voltage is become power controlling trim Q2 output is to realize the output of minute-pressure difference.Preferably, the output voltage+VH OUT of first via output output voltage+VL OUT 3V at least of being higher than the second tunnel output.
See also Fig. 1 and Fig. 3; In a preferred embodiment; The power adjustments device is the first triode Q2, and the first triode Q2 provides the second tunnel output+VL OUT by its collector C-emitter E, and driving circuit becomes the output conversion of signals of boosting voltage the drive signal of the base stage B voltage of the control first triode Q2; The pressure drop VCE of its collector C-emitter E is less than the magnitude of voltage of setting when making the first triode saturation conduction, as less than 0.1V.Preferably, the first triode Q2 is the NPN triode, and its saturation conduction voltage VBE is 0.7V.
In a preferred embodiment; Utilization is bigger to the B utmost point of controlling the first triode Q2 more than the high voltage of 3V than low-voltage output; The pressure drop of CE is less than 0.1V when making the first triode Q2 saturation conduction, thereby realizes the output of minute-pressure difference, most effective reaching more than 95%.
In a preferred embodiment, before the voltage stabilizing output voltage+VLOUT of the output terminal of the voltage+VL of input end after than its voltage stabilizing more than or equal to 0.1V.
See also Fig. 1-Fig. 3; In a preferred embodiment, driving circuit comprises the second triode Q3, and accessory power supply is coupled to the collector of the second triode Q3 through the first resistance R V1; And be coupled to the base stage of the second triode Q3 through second resistance R 21; The emitter-coupled of the second triode Q3 is to the control end of power adjustments device, and is coupled to the negative terminal of the second tunnel output through the 3rd resistance R 22, and the base stage of the second triode Q3 is coupled to the output terminal of feedback circuit.
See also Fig. 2 and Fig. 3; In another preferred embodiment; Minute-pressure difference linear voltage-stabilized power supply circuit also comprises short-circuit protection circuit; The input end of short-circuit protection circuit is coupled to the anode of the second tunnel output, and the output terminal of short-circuit protection circuit is coupled to the base stage of the second triode Q3, and short-circuit protection circuit is reduced to setting threshold at the output voltage that detects the second tunnel output and makes the second triode Q3 ground connection when following and lose bias voltage; And then power controlling trim Q2 no-output, realize short-circuit protection.
See also Fig. 2 and Fig. 3; In a preferred embodiment; Feedback circuit comprises that the anode of reference voltage controller IC 3, the second tunnel output is coupled to the sampling end of reference voltage controller IC 3 through the 3rd divider resistance R27, and passes through the 4th divider resistance R28 ground connection; The output terminal of reference voltage controller IC 3 is coupled to the control end of driving circuit; Reference voltage controller IC 3 amplifies with internal reference voltage Jin is capable the sampling voltage of input Bi Jiao ﹑, export the output voltage of signal control drive circuit, thereby stablize the output voltage of the first triode Q2.More preferably, feedback circuit also comprises the sampling end that is connected in parallel on reference voltage controller IC 3 and the compensating circuit between the output terminal, and compensating circuit comprises the 6th resistance R 29 and the 3rd capacitor C 13 that is in series.
The principle that realizes the output of minute-pressure difference sees also Fig. 3.After Switching Power Supply was opened ,+VH OUT high voltage had voltage to exist with+VL low-voltage simultaneously, for example+and VH OUT >=+VL OUT+ 3V; + VH OUT is added to the B utmost point of the second triode Q3, the second triode Q3 conducting to voltage through resistance R 21; + VH OUT provides driving voltage, the first triode Q2 conducting of power adjustments device for the B utmost point of the power adjustments device first triode Q2 through the CE utmost point of the resistance R V1 and the second triode Q3; + VLOUT is added to voltage+VL OUT through the CE utmost point of the power adjustments device first triode Q2.Internal reference voltage Jin is capable amplifies Bi Jiao ﹑ through divider resistance R27 and R28 sampling voltage and accurate reference voltage controller IC 3 for+VL OUT; Control the voltage of the B utmost point of the second triode Q3 through the C of accurate reference voltage controller IC 3 end; Again through the voltage of the B utmost point of the E utmost point power controlling trim first triode Q2 of the second triode Q3, thus the output voltage of the firm power trim first triode Q2.In a preferred embodiment, the base voltage V Q2B of the NPN first triode Q2 equals+VL OUT adds the saturation conduction voltage VBE of 0.7V, during the power adjustments device first triode Q2 saturation conduction pressure drop of CE less than 0.1V, thereby realize the output of minute-pressure difference.Preferably resistance R 29 and capacitor C 13 are added in the compensating circuit of the CR end composition IC3 of IC3, play the effect of stable reference voltage controller IC 3 work.Resistance R 22 is the biasing resistor of the first triode Q2.
See also Fig. 2 and Fig. 3; In a preferred embodiment; Short-circuit protection circuit comprises the 3rd triode Q4 and the 4th triode Q5, and the anode of first via output is coupled to the emitter of the 3rd triode Q4 and an end of first capacitor C 11 through the first divider resistance R23, and through the second divider resistance R24 ground connection; The base stage of another termination the 3rd triode Q4 of first capacitor C 11; And being coupled to the anode of the second tunnel output through the 4th resistance R 26, the collector of the 3rd triode Q4 connects the base stage of the 4th triode Q5, and through the 5th resistance R 25 ground connection; The grounded emitter of the 4th triode Q5, the collector of the 4th triode Q5 connect the base stage of the output terminal and the second triode Q3 of feedback circuit.
The principle that realizes short-circuit protection sees also Fig. 3.After Switching Power Supply is opened; + VH OUT process resistance R 23 and R24 dividing potential drop are that the E utmost point of the 3rd triode Q4 provides bias voltage; The 3rd triode Q4 can adopt the PNP triode; Saturation conduction voltage VEB is 0.3V, and it for example is that 90%+VL OUT adds 0.3V that the E utmost point of the 3rd triode Q4 provides bias voltage.Capacitor C 11 connects the EB utmost point of the 3rd triode Q4; Moment C11 two ends in energising are equivalent to short circuit; The emitter voltage VQ4E of the 3rd triode Q4 charges to C11; Simultaneously+and VL OUT provides bias voltage for the B utmost point of the 3rd triode Q4 through resistance R 26, and voltage VQ4B is greater than voltage VQ4E, and the 3rd triode Q4 ends.This moment, the C utmost point of the 3rd triode Q4 did not have voltage, and the C utmost point of the 3rd triode Q4 is connected to the B utmost point of the 4th triode Q5, so thereby the BE utmost point of the 4th triode Q5 does not have bias voltage that the 4th triode Q5 ends.This makes the second triode Q3 operate as normal, also operate as normal of the first triode Q2 so, thus there is voltage+VL OUT normally to export.The biasing and the anti-jamming circuit of the resistance R 25 and the B utmost point of capacitor C 12 compositions the 4th triode Q5 are to stablize the work of the 4th triode Q5.
When output short-circuit or system load are unusual; As long as output voltage+VL OUT is reduced to below the setting threshold, when for example 90%+VL OUT ratings was following, this voltage was added to the B utmost point of the 3rd triode Q4 through resistance R 26; When its voltage VQ4EB greater than 0.3V, the EC utmost point conducting of the 3rd triode Q4.+ VH OUT is after resistance R 23 and R24 dividing potential drop; Through the EB utmost point of the 3rd triode Q4, through being added to the B utmost point of the 4th triode Q5 after the shunting of resistance R 25, the BE utmost point of the 4th triode Q5 obtains bias voltage VQ5BE; The CE utmost point conducting of the 4th triode Q5, voltage VQ5C is almost nil.Because the C utmost point of the 4th triode Q5 is connected to the B utmost point of the second triode Q3; Q3 ended after the B utmost point of the second triode Q3 lost bias voltage VQ3BE; So the E pole tension of the second triode Q3 is zero; And the E utmost point of the second triode Q3 is connected to the B utmost point of the first triode Q2, thus therefore this moment the power adjustments device first triode Q2 the B utmost point lose bias voltage VQ2BE and end.Because the E utmost point of the first triode Q2 does not have voltage ,+VL OUT is output not, the existing output short circuit protection of historical facts or anecdotes.
For example; When output 5V short circuit; Output voltage is reduced to below the 4.5V, and the EC conducting of the 3rd triode Q4 provides forward voltage, the CE conducting of the 4th triode Q5 for the B utmost point of the 4th triode Q5; The second triode Q3 ends after making the B utmost point of the second triode Q3 lose bias voltage, thereby the B utmost point of the power adjustments device first triode Q2 loses bias voltage by not output simultaneously.
See also Fig. 1 and Fig. 3, preferably, Switching Power Supply also comprises capacitor C 9 and the EC6 that is connected across between the second road output plus terminal+VL OUT, the negative terminal-VL OUT, and the filtering of composition+VL OUT and anti-jamming circuit are with the output voltage of stable+VL OUT.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (9)
1. minute-pressure difference linear voltage-stabilized power supply circuit; Has the first via output at least and the second tunnel output; The output voltage of said first via output is higher than the output voltage of said the second tunnel output; It is characterized in that said power circuit comprises auxilliary help electric source ﹑ driving circuit, feedback circuit and power adjustments device, the anode of said the second tunnel output is coupled to the input end of said feedback circuit; The output terminal of said feedback circuit is coupled to the control end of said driving circuit; The input end of said driving circuit is coupled to the anode as the said first via output of said accessory power supply, and the output terminal of said driving circuit is coupled to the control end of said power adjustments device, and the output terminal of said power adjustments device is coupled to the anode of said the second tunnel output.
2. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 1 is characterized in that, said power adjustments device is first triode (Q2), and said first triode (Q2) provides said the second tunnel output by its collector-emitter.
3. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 2 is characterized in that said first triode is the NPN triode.
4. like each described minute-pressure difference linear voltage-stabilized power supply circuit of claim 1 to 3; It is characterized in that; Said driving circuit comprises second triode (Q3); Said accessory power supply is coupled to the collector of said second triode (Q3) through first resistance (RV1), and is coupled to the base stage of said second triode (Q3) through second resistance (R21), and the emitter-coupled of said second triode (Q3) is to the control end of said power adjustments device; And through the 3rd resistance (R22) be coupled to said the second the tunnel output negative terminal, the base stage of said second triode (Q3) is coupled to the output terminal of said feedback circuit.
5. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 4; It is characterized in that; Said power circuit also comprises short-circuit protection circuit; The input end of said short-circuit protection circuit is coupled to the anode of said the second tunnel output, and the output terminal of said short-circuit protection circuit is coupled to the base stage of said second triode (Q3).
6. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 5; It is characterized in that; Said short-circuit protection circuit comprises the 3rd triode (Q4) and the 4th triode (Q5); The anode of said first via output is coupled to the emitter of said the 3rd triode (Q4) and an end of first electric capacity (C11) through first divider resistance (R23); And through second divider resistance (R24) ground connection, the base stage of said the 3rd triode of another termination of said first electric capacity (C11) (Q4), and be coupled to said the second tunnel anode exported through the 4th resistance (R26); The collector of said the 3rd triode (Q4) connects the base stage of said the 4th triode (Q5); And through the 5th resistance (R25) ground connection, the grounded emitter of said the 4th triode (Q5), the collector of said the 4th triode (Q5) connects the base stage of the output terminal and said second triode (Q3) of said feedback circuit.
7. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 6 is characterized in that said the 3rd triode (Q4) is the PNP triode, and said the 4th triode (Q5) is the NPN triode.
8. like each described minute-pressure difference linear voltage-stabilized power supply circuit of claim 1 to 3; It is characterized in that; Said feedback circuit comprises reference voltage controller (IC3); The anode of said the second tunnel output is coupled to the sampling end of said reference voltage controller (IC3) through the 3rd divider resistance (R27), and passes through the 4th divider resistance (R28) ground connection, and the output terminal of said reference voltage controller (IC3) is coupled to the said control end that is coupled to said driving circuit.
9. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 8; It is characterized in that; Said feedback circuit also comprises the sampling end that is connected in parallel on said reference voltage controller (IC3) and the compensating circuit between the output terminal, and said compensating circuit comprises the 6th resistance (R29) and the 3rd electric capacity (C13) that is in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120136331XU CN202159282U (en) | 2011-05-03 | 2011-05-03 | Micro dropout linear voltage stabilization power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120136331XU CN202159282U (en) | 2011-05-03 | 2011-05-03 | Micro dropout linear voltage stabilization power supply circuit |
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| Publication Number | Publication Date |
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| CN202159282U true CN202159282U (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120136331XU Expired - Fee Related CN202159282U (en) | 2011-05-03 | 2011-05-03 | Micro dropout linear voltage stabilization power supply circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123511A (en) * | 2013-01-23 | 2013-05-29 | 浙江工业大学 | Hybrid type voltage-stabilized power supply |
| CN104466912A (en) * | 2014-11-27 | 2015-03-25 | 矽力杰半导体技术(杭州)有限公司 | Linear voltage regulator with short-circuit protection function |
-
2011
- 2011-05-03 CN CN201120136331XU patent/CN202159282U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123511A (en) * | 2013-01-23 | 2013-05-29 | 浙江工业大学 | Hybrid type voltage-stabilized power supply |
| CN103123511B (en) * | 2013-01-23 | 2014-11-12 | 浙江工业大学 | Hybrid type voltage-stabilized power supply |
| CN104466912A (en) * | 2014-11-27 | 2015-03-25 | 矽力杰半导体技术(杭州)有限公司 | Linear voltage regulator with short-circuit protection function |
| CN104466912B (en) * | 2014-11-27 | 2017-08-25 | 矽力杰半导体技术(杭州)有限公司 | A kind of linear voltage regulator with short-circuit protection |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20120307 Termination date: 20160503 |