CN102214996B - Micro-voltage-difference linear voltage-stabilizing power circuit - Google Patents
Micro-voltage-difference linear voltage-stabilizing power circuit Download PDFInfo
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Abstract
The invention discloses a micro-voltage-difference linear voltage-stabilizing power circuit, which at least has a first path of output and a second path of output, wherein an output voltage of the first path of output is higher than the output voltage of the second path of output; the power circuit comprises an auxiliary power supply, a driving circuit, a feedback circuit and a power regulation device; a positive end of the second path of output is coupled to an input end of the feedback circuit; an output end of the feedback circuit is coupled to a control end of the driving circuit; the input end of the driving circuit is coupled to the positive end of the first path of output serving as the auxiliary power supply; the output end of the driving circuit is coupled to the control end of the power regulation device; the output end of the power regulation device is coupled to the positive end of the second path of output; and the driving circuit converts an output signal of an auxiliary voltage into a signal for controlling the output of the power regulation device according to the output of the feedback circuit to realize the output of a micro voltage difference. Output short circuit protection can be realized by further arranging a short-circuit protection circuit.
Description
Technical field
The present invention relates to power-supply device, particularly relate 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 voltage is exported to system's power supply, because the characteristic of Switching Power Supply, when system load is uneven, the two-way of Switching Power Supply common transformer or multichannel output voltage intersection are drawn the bound of voltage meeting offset criteria value when carrying, for example one tunnel load is minimum, when other one tunnel load is maximum, two groups of voltages can produce drift, load is the upper limit that minimum one tunnel voltage can exceed standard, load is that maximum one tunnel voltage can substandard lower limit, exceeds the operating voltage range of system, causes the 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 (be with 1A example calculate the 3-4W loss is just arranged) so just must be used very big radiator like this, has not only increased cost but also strengthened the space.Two, adopt the DC-DC scheme that high voltage is converted to the little electric current of low-voltage, 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.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of high-efficiency and low-cost minute-pressure difference linear voltage-stabilized power supply circuit is provided.
For achieving the above object, the present invention is by the following technical solutions:
A kind of minute-pressure difference linear voltage-stabilized power supply circuit, has first via output at least and the second tunnel output, the output voltage of described first via output is higher than the output voltage of described the second tunnel output, described power circuit comprises that Fu helps Dian Yuan ﹑ drive circuit, feedback circuit and power adjustments device, the anode of described the second tunnel output is coupled to the input of described feedback circuit, the output of described feedback circuit is coupled to the control end of described drive circuit, the input of described drive circuit is coupled to the anode as the described first via output of described accessory power supply, the output of described drive circuit is coupled to the control end of described power adjustments device, the output of described power adjustments device is coupled to the anode of described the second tunnel output, described drive circuit is according to the output of described feedback circuit, converts the output signal of described accessory power supply the signal of the described power adjustments device output of control to realize the output of minute-pressure difference.
Preferably, described power adjustments device is first triode, described first triode provides described the second tunnel output by its collector electrode-emitter, described drive circuit converts the output signal of described accessory power supply to the driving signal of the base voltage of described first triode of control, the pressure drop of its collector electrode-emitter is less than the low voltage value of setting, as 0.1V when making the described first triode saturation conduction.
More preferably, described first triode is the NPN triode,
Preferably, the output voltage of described first via output exceeds described the second tunnel output voltage of exporting 3V at least.
Preferably, described drive circuit comprises second triode, described accessory power supply is coupled to the collector electrode of described second triode by first resistance, and be coupled to the base stage of described second triode by second resistance, the emitter-coupled of described second triode is to the control end of described power adjustments device, and by the 3rd resistance be coupled to described the second the tunnel output negative terminal, the base stage of described second triode is coupled to the output of described feedback circuit.
Preferably; described power circuit also comprises short-circuit protection circuit; the input of described short-circuit protection circuit is coupled to the anode of described the second tunnel output; the output of described short-circuit protection circuit is coupled to the base stage of described second triode; described short-circuit protection circuit is reduced to setting threshold at the output voltage that detects described the second tunnel output and makes the described second triode ground connection when following and lose bias voltage, and then controls described power adjustments device no-output.Setting threshold for example is 90%+VL OUT rated value.
More preferably; described short-circuit protection circuit comprises the 3rd triode and the 4th triode; the anode of described first via output is coupled to the emitter of described the 3rd triode and an end of first electric capacity by first divider resistance; and by the second divider resistance ground connection; the base stage of described the 3rd triode of another termination of described first electric capacity; and by the 4th resistance be coupled to described the second the tunnel output anode; the collector electrode of described the 3rd triode connects the base stage of described the 4th triode; and by the 5th grounding through resistance; the grounded emitter of described the 4th triode, the collector electrode of described the 4th triode connect the base stage of output and described second triode of described feedback circuit.
More preferably, described the 3rd triode is the PNP triode, and described the 4th triode is the NPN triode.
Preferably, described feedback circuit comprises the reference voltage controller, the anode of described the second tunnel output is coupled to the sampling end of described reference voltage controller by the 3rd divider resistance, and by the 4th divider resistance ground connection, the output of described reference voltage controller is coupled to the control end of described drive circuit, described reference voltage controller amplifies with internal reference voltage Jin is capable the sampling voltage of input Bi Jiao ﹑, output signal is controlled the output voltage of described drive circuit, thereby stablizes the output voltage of described first triode.
More preferably, described feedback circuit also comprises the sampling end that is connected in parallel on described reference voltage controller and the compensating circuit between the output, and described compensating circuit comprises the 6th resistance and the 3rd electric capacity that is in series.
Beneficial technical effects of the present invention is:
Compare prior art, minute-pressure difference linear voltage-stabilized power supply circuit of the present invention can fine solution two-way or multi-output switch power source draw 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 Switching Power Supply power supply of the present invention to realize the output of minute-pressure difference, its most effective reaching more than 95%.
Further, the power adjustments device adopts triode, because the pressure reduction at power adjustments device collector electrode-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 the employing embodiment of the invention;
Fig. 2 is the circuit block diagram of the minute-pressure difference linear voltage-stabilized power supply circuit of one embodiment of the invention;
Fig. 3 is the concrete circuit theory diagrams of minute-pressure difference linear voltage-stabilized power supply circuit of a preferred embodiment of the invention.
Embodiment
By reference to the accompanying drawings the present invention is further described in detail by the following examples.
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 drive 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 of feedback circuit, the output of feedback circuit is coupled to the control end of drive circuit, the input of drive circuit is coupled to the anode as the first via output of accessory power supply, the output of drive circuit is coupled to the control end of power adjustments device, the output of power adjustments device is coupled to the anode of the second tunnel output, drive circuit is according to the output of feedback circuit, converts the output signal of accessory power supply the signal of control power adjustments device Q2 output to realize the output of minute-pressure difference.Preferably, the output voltage+VH OUT of first via output is higher than the second tunnel output voltage+VL OUT that exports 3V at least.
See also Fig. 1 and Fig. 3, in a preferred embodiment, the power adjustments device is the first triode Q2, the first triode Q2 provides the second tunnel output+VL OUT by its collector electrode C-emitter E, drive circuit converts the output signal of accessory power supply to the driving signal of the base stage B voltage of the control first triode Q2, the pressure drop VCE of its collector electrode 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 of the voltage+VL of input after than its voltage stabilizing more than or equal to 0.1V.
See also Fig. 1-Fig. 3, in a preferred embodiment, drive circuit comprises the second triode Q3, accessory power supply is coupled to the collector electrode of the second triode Q3 by the first resistance R V1, and be coupled to the base stage of the second triode Q3 by 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 by the 3rd resistance R 22, and the base stage of the second triode Q3 is coupled to the output 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 of short-circuit protection circuit is coupled to the anode of the second tunnel output; the output of short-circuit protection circuit is coupled to the base stage of the second triode Q3; 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 control power adjustments device Q2 no-output, realize short-circuit protection.
See also Fig. 2 and Fig. 3, in a preferred embodiment, feedback circuit comprises reference voltage controller IC 3, the anode of the second tunnel output is coupled to the sampling end of reference voltage controller IC 3 by the 3rd divider resistance R27, and by the 4th divider resistance R28 ground connection, the output of reference voltage controller IC 3 is coupled to the control end of drive circuit, reference voltage controller IC 3 amplifies with internal reference voltage Jin is capable the sampling voltage of input Bi Jiao ﹑, output signal is controlled the output voltage of drive circuit, thereby stablizes 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, 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 resistance R V1 and the second triode Q3; + VLOUT is added to voltage+VL OUT by 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, control the voltage of the B utmost point of the power adjustments device first triode Q2 again through the E utmost point of the second triode Q3, thereby firm power is regulated the output voltage of the device 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.The CR end that preferably resistance R 29 and capacitor C 13 is added in IC3 is formed the compensating circuit of IC3, plays 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; the anode of first via output is coupled to the emitter of the 3rd triode Q4 and an end of first capacitor C 11 by the first divider resistance R23; and by the second divider resistance R24 ground connection; the base stage of another termination the 3rd triode Q4 of first capacitor C 11; and by the 4th resistance R 26 be coupled to the second the tunnel output anode; the collector electrode of the 3rd triode Q4 connects the base stage of the 4th triode Q5; and by the 5th resistance R 25 ground connection; the grounded emitter of the 4th triode Q5, the collector electrode of the 4th triode Q5 connect the base stage of output 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 provide bias voltage for the E utmost point of the 3rd triode Q4, the 3rd triode Q4 can adopt the PNP triode, and saturation conduction voltage VEB is 0.3V, and the E utmost point of the 3rd triode Q4 provides bias voltage for example to add 0.3V for 90%+VL OUT.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+VL OUT provides bias voltage for the B utmost point of the 3rd triode Q4 through resistance R 26, 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.Resistance R 25 and capacitor C 12 are formed biasing and the anti-jamming circuit of the B utmost point of the 4th triode Q5, 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 rated value 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, by 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, the EC conducting of the 3rd triode Q4 provides conducting voltage for the B utmost point of the 4th triode Q5, the CE conducting 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 be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. minute-pressure difference linear voltage-stabilized power supply circuit, has first via output at least and the second tunnel output, the output voltage of described first via output is higher than the output voltage of described the second tunnel output, it is characterized in that, described power circuit comprises that Fu helps Dian Yuan ﹑ drive circuit, feedback circuit and power adjustments device, the anode of described the second tunnel output is coupled to the input of described feedback circuit, the output of described feedback circuit is coupled to the control end of described drive circuit, the input of described drive circuit is coupled to the anode as the described first via output of described accessory power supply, the output of described drive circuit is coupled to the control end of described power adjustments device, the output of described power adjustments device is coupled to the anode of described the second tunnel output, described drive circuit is according to the output of described feedback circuit, convert the output signal of described accessory power supply the signal of the described power adjustments device output of control to realize the output of minute-pressure difference, described drive circuit comprises second triode (Q3), described accessory power supply is coupled to the collector electrode of described second triode (Q3) by first resistance (RV1), and be coupled to the base stage of described second triode (Q3) by second resistance (R21), the emitter-coupled of described second triode (Q3) is to the control end of described power adjustments device, and by the 3rd resistance (R22) be coupled to described the second the tunnel output negative terminal, the base stage of described second triode (Q3) is coupled to the output of described feedback circuit.
2. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that, described power adjustments device is first triode (Q2), described first triode (Q2) provides described the second tunnel output by its collector electrode-emitter, described drive circuit converts the output signal of described accessory power supply the driving signal of the base voltage of described first triode of control (Q2) to according to the output of described feedback circuit, and the pressure drop of its collector electrode-emitter is less than the low voltage value of setting when making described first triode (Q2) saturation conduction.
3. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 2 is characterized in that, described first triode is the NPN triode.
4. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 1 is characterized in that, the output voltage of described first via output exceeds described the second tunnel output voltage of exporting 3V at least.
5. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 1; it is characterized in that; described power circuit also comprises short-circuit protection circuit; the input of described short-circuit protection circuit is coupled to the anode of described the second tunnel output; the output of described short-circuit protection circuit is coupled to the base stage of described second triode (Q3); described short-circuit protection circuit is reduced to setting threshold at the output voltage that detects described the second tunnel output and makes described second triode (Q3) ground connection when following and lose bias voltage, and then controls described power adjustments device no-output.
6. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 5; it is characterized in that; described short-circuit protection circuit comprises the 3rd triode (Q4) and the 4th triode (Q5); the anode of described first via output is coupled to the emitter of described the 3rd triode (Q4) and an end of first electric capacity (C11) by first divider resistance (R23); and by second divider resistance (R24) ground connection; the base stage of described the 3rd triode of another termination of described first electric capacity (C11) (Q4); and by the 4th resistance (R26) be coupled to described the second the tunnel output anode; the collector electrode of described the 3rd triode (Q4) connects the base stage of described the 4th triode (Q5); and by the 5th resistance (R25) ground connection; the grounded emitter of described the 4th triode (Q5), the collector electrode of described the 4th triode (Q5) connect the base stage of output and described second triode (Q3) of described feedback circuit.
7. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 6 is characterized in that, described the 3rd triode (Q4) is the PNP triode, and described the 4th triode (Q5) is the NPN triode.
8. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 2, it is characterized in that, described feedback circuit comprises reference voltage controller (IC3), the anode of described the second tunnel output is coupled to the sampling end of described reference voltage controller (IC3) by the 3rd divider resistance (R27), and by the 4th divider resistance (R28) ground connection, the output of described reference voltage controller (IC3) is coupled to the base stage of described second triode (Q3), described reference voltage controller (IC3) amplifies with internal reference voltage Jin is capable the sampling voltage of input Bi Jiao ﹑, output signal is controlled the output voltage of described drive circuit, thereby stablizes the output voltage of described first triode (Q2).
9. minute-pressure difference linear voltage-stabilized power supply circuit as claimed in claim 8, it is characterized in that, described feedback circuit also comprises the sampling end that is connected in parallel on described reference voltage controller (IC3) and the compensating circuit between the output, and described compensating circuit comprises the 6th resistance (R29) and the 3rd electric capacity (C13) that is in series.
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| CN108109484B (en) * | 2017-12-27 | 2021-06-22 | 周口师范学院 | Pythagorean theorem demonstration device capable of being adjusted in proper amount |
| CN112448600A (en) * | 2019-09-03 | 2021-03-05 | 西安航兴海拓电子科技有限公司 | Integrated power supply |
| CN110557024B (en) * | 2019-09-12 | 2020-12-18 | 北京精密机电控制设备研究所 | Magnetic feedback DCDC conversion circuit |
| CN113659831B (en) * | 2021-08-06 | 2023-03-31 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
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| CN1684350A (en) * | 2004-04-12 | 2005-10-19 | 台达电子工业股份有限公司 | Time delay control scheme for a power supply with multiple outputs |
| CN101714820A (en) * | 2009-12-22 | 2010-05-26 | 中国航空工业集团公司第六三一研究所 | Multiplexed output power of low-voltage power supply |
| CN201699585U (en) * | 2010-05-21 | 2011-01-05 | 深圳市易能电气技术有限公司 | Novel intelligent voltage stabilizing circuit |
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| JP2001236130A (en) * | 2000-02-21 | 2001-08-31 | Alps Electric Co Ltd | Power supply circuit |
| JP4094487B2 (en) * | 2003-05-21 | 2008-06-04 | ローム株式会社 | Power supply for positive / negative output voltage |
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| CN1684350A (en) * | 2004-04-12 | 2005-10-19 | 台达电子工业股份有限公司 | Time delay control scheme for a power supply with multiple outputs |
| CN101714820A (en) * | 2009-12-22 | 2010-05-26 | 中国航空工业集团公司第六三一研究所 | Multiplexed output power of low-voltage power supply |
| CN201699585U (en) * | 2010-05-21 | 2011-01-05 | 深圳市易能电气技术有限公司 | Novel intelligent voltage stabilizing circuit |
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