CN102570800A - Constant-voltage output device - Google Patents
Constant-voltage output device Download PDFInfo
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- CN102570800A CN102570800A CN2011104495476A CN201110449547A CN102570800A CN 102570800 A CN102570800 A CN 102570800A CN 2011104495476 A CN2011104495476 A CN 2011104495476A CN 201110449547 A CN201110449547 A CN 201110449547A CN 102570800 A CN102570800 A CN 102570800A
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Abstract
The invention discloses a constant-voltage output device comprising an electric double-layer capacitor, an energy storage unit, a switch unit, a voltage sampling unit and a control unit, wherein the energy storage unit is used for storing electric energy output by the electric double-layer capacitor and outputting voltages to an external load; the switch unit is used for controlling the electric connection or disconnection between the electric double-layer capacitor and the energy storage unit; the voltage sampling unit is used for acquiring the voltages output by the energy storage unit; the control unit is used for generating a pulse signal for controlling the switch unit to be switched on or off; the electric double-layer capacitor is used for supplying electrical energy to the energy storage unit through the switch unit; and the control unit is used for adjusting the pulse width of the pulse signal on the basis of the voltages output by the energy storage unit and the voltages output by the electric double-layer capacitor. A voltage-stabilizing circuit with voltage increment and reduction functions is adopted in the constant-voltage output device, thus, the ratio of the residual electric quantity in the electric double-layer capacitor to the whole stored electric quantity of the capacitor is further reduced to realize the sufficient utilization of the electric double-layer capacitor.
Description
Technical field
The present invention relates to a kind of device of exporting stable constant voltage, particularly relate to a kind of constant voltage output device that is used for farad capacitor.
Background technology
Farad capacitor has another name called electrochemical capacitor or super capacitor, is a kind of novel energy storage device that grows up the 1970s and 1980s in last century.It is a kind of between traditional capacitor and battery, power supply with property, mainly rely on electric double layer and redox pseudocapacity Charge Storage electric energy, thereby be different from traditional chemical power source.The outstanding advantage of farad capacitor is that power density is high, the time that discharges and recharges lacks, has extended cycle life and operating temperature range is wide.So wide application prospect is arranged, particularly in some fields, can replace storage battery, and realize that product need not change the target of storage battery in the military service cycle, thereby become real non-maintaining stand-by power supply.
But farad capacitor has similar discharge curve with common electrical, i.e. load one timing, and output voltage descends exponentially.But,, always hope it and can export constant voltage constantly during with farad capacitor as stand-by power supply, therefore just need to adopt voltage stabilizing circuit to make said farad capacitor can export and decide very much voltage as power supply.
Yet if adopt decompression voltage regulator, farad capacitor voltage must be greater than output voltage, and when farad capacitor voltage equates with output voltage, reduction voltage circuit can't work on, and can cause dump energy to make full use of.
If adopt voltage boosting and stabilizing circuit, then farad capacitor voltage can not surpass output voltage in addition, and when farad capacitor voltage is discharged to 1/3～1/4 voltage, booster circuit can't work on, and can cause the farad capacitor electric weight to make full use of equally.
Summary of the invention
The technical problem that the present invention will solve is the defective that can't make full use of for the electric weight that overcomes farad capacitor storage in the prior art; A kind of constant voltage output device is provided, has to boost through use and improve the utilance of electric weight in the farad capacitor with the voltage stabilizing circuit of buck functionality.
The present invention solves above-mentioned technical problem through following technical proposals:
The invention provides a kind of constant voltage output device, comprise a farad capacitor, be used to store electric energy and the extraneous load of output voltage to of said farad capacitor output an energy-storage units, be used to control the switch element that conducts between said farad capacitor and the said energy-storage units or break off, a control unit that the voltage sample unit and being used to that is used to gather the voltage of said energy-storage units output generates a pulse signal of the said switch element closure or openness of control; Wherein said farad capacitor is that said energy-storage units provides electric energy through said switch element, and said control unit is also based on the pulse duration of the said pulse signal of voltage-regulation of the voltage of said energy-storage units output and the output of said farad capacitor.
Preferably, said constant voltage output device also comprises a plurality of farad capacitors, each farad capacitor connection parallel with one another and be that said energy-storage units provides electric energy through said switch element all.
Preferably, said energy-storage units comprises that an energy-storage travelling wave tube, is exported switch module and a voltage is kept module, and said control unit also is used to control the closure or openness of said output switch module; Wherein when said output switch module was closed, said energy-storage travelling wave tube received and stores the electric energy of said farad capacitor output, and said voltage is kept module and kept the voltage that said energy-storage units exports said extraneous load to; When said output switch module was opened, said energy-storage travelling wave tube output voltage to extraneous load was also kept the module electric energy supplement for said voltage.
Preferably; Said switch element comprises one first metal-oxide-semiconductor; The grid of said first metal-oxide-semiconductor is electrically connected with said control unit, and the drain electrode of said first metal-oxide-semiconductor is electrically connected with said farad capacitor, and the source electrode of said first metal-oxide-semiconductor is electrically connected with said energy-storage units.
Preferably, said switch element also comprises one first driver that is used to drive said first metal-oxide-semiconductor, and said first driver is serially connected with between the grid and said control unit of said first metal-oxide-semiconductor.
Preferably, said output switch module comprises one second metal-oxide-semiconductor, and the grid of said second metal-oxide-semiconductor is electrically connected with said control unit, and the drain electrode of said second metal-oxide-semiconductor is electrically connected with said energy-storage travelling wave tube, the source ground of said second metal-oxide-semiconductor.
Preferably, said output switch module also comprises one second driver that is used to drive said second metal-oxide-semiconductor, and said second driver is serially connected with between the grid and said control unit of said second metal-oxide-semiconductor.
Preferably, said voltage is kept module and is comprised an electrochemical capacitor, and the anode of said electrochemical capacitor is electrically connected on the drain electrode of said second metal-oxide-semiconductor, the minus earth of said electrochemical capacitor.
Preferably; Said voltage is kept module and is also comprised one first fly-wheel diode; Said first fly-wheel diode is serially connected with between the anode of drain electrode and said electrochemical capacitor of said second metal-oxide-semiconductor; The anode of wherein said first fly-wheel diode is electrically connected on the drain electrode of said second metal-oxide-semiconductor, and the cathodic electricity of said first fly-wheel diode is connected in the anode of said electrochemical capacitor.
Preferably, said voltage is kept module and is also comprised one second fly-wheel diode, and the anode of said second fly-wheel diode is electrically connected on the source electrode of said first metal-oxide-semiconductor, and the cathodic electricity of said second fly-wheel diode is connected in the negative electrode of said electrochemical capacitor.
Positive progressive effect of the present invention is:
Constant voltage output device of the present invention has the voltage stabilizing circuit of step-down and boost function through employing, when farad capacitor voltage is higher than output voltage, carries out lowering and stabilizing blood pressure automatically.Along with the decline of farad capacitor voltage,, transfer the voltage stabilizing of boosting automatically to when farad capacitor during smaller or equal to output voltage.Thereby make that dump energy will dwindle in the ratio of whole capacitor storing electricity further in the said farad capacitor, thereby realize making full use of of farad capacitor.
Description of drawings
Fig. 1 is the circuit structure diagram of the preferred embodiment of constant voltage output device of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to specify technical scheme of the present invention.
Embodiment:
As shown in Figure 1, the constant voltage output device of present embodiment comprises: a farad capacitor group 1, one first metal-oxide-semiconductor 2 (mos field effect transistor), one second metal-oxide-semiconductor 3, a MCU (microcontroller) 4, an inductance 5, an electrochemical capacitor 6, one first fly-wheel diode 7, one second fly-wheel diode 8, a resistance 9a and a resistance 9b, one first driver 10a and one second driver 10b.
Wherein the group of farad capacitor described in the present embodiment 1 is electrically connected on the drain electrode of said first metal-oxide-semiconductor 2; The source electrode of said first metal-oxide-semiconductor 2 is electrically connected with an end of said inductance 5, and the grid of said first metal-oxide-semiconductor 2 is electrically connected with said MCU4 through the said first driver 10a.
The other end of said inductance 5 is electrically connected with the drain electrode of said second metal-oxide-semiconductor 3, the source ground of said second metal-oxide-semiconductor 3, and the grid of said second metal-oxide-semiconductor 3 is electrically connected with said MCU4 through the said second driver 10b; The other end of said inductance 5 also is electrically connected with the anode of said first fly-wheel diode 7, and the negative electrode of said fly-wheel diode 7 is electrically connected with the anode of said electrochemical capacitor 6; The anode of said electrochemical capacitor is connected to extraneous load through an output terminals A, the minus earth of said electrochemical capacitor.One end of said inductance 5 also is connected with the cathodic electricity of said second fly-wheel diode 8, the plus earth of said second fly-wheel diode 8.
Said in addition output terminals A is electrically connected with a voltage acquisition end B through said resistance 9a, and said voltage acquisition end B is also through said resistance 9b ground connection.Said MCU4 also is electrically connected with said voltage acquisition end B.Said MCU4 also is electrically connected with said farad capacitor group 1.
Comprise 3 farad capacitors that are connected in parallel 11 in the farad capacitor group 1 of present embodiment; The anode of wherein said farad capacitor 11 is electrically connected mutually; The negative electrode of said farad capacitor 11 also is electrically connected each other, can export the requirement of electric energy or the farad capacitor group that demand adopts one or more farad capacitors to constitute to farad capacitor according to external device in addition.
Adopt said inductance 5 to store the electric energy of said farad capacitor group 1 output in the present embodiment, can adopt the energy-storage travelling wave tube of other kinds in addition and store the electric energy of said farad capacitor group 1 output.
Electrochemical capacitor described in the present embodiment 6 can be stored the electric energy of said inductance 5 outputs, and keeps the amplitude of the voltage of said inductance 5 outputs, thereby stablizes the voltage of said inductance 5 outputs.Voltage fluctuation in the voltage of said inductance 5 outputs of said in addition electrochemical capacitor 6 all right filterings.Can adopt the voltage of other energy storage exoergic device formation to keep the output voltage that module is kept said output terminals A in addition.
Said in addition first fly-wheel diode 7 and second fly-wheel diode 8 and said second metal-oxide-semiconductor 3, electrochemical capacitor 6 and inductance 5 constituted said electrochemical capacitor 6 fill can and the exoergic circuit; Conducting through said second metal-oxide-semiconductor 3 and by and the charging and the discharge of inductance 5, whether said first fly-wheel diode 7 and the 8 common controls of second fly-wheel diode are that said electrochemical capacitor 6 charges.
Inductance described in the present embodiment 5, second metal-oxide-semiconductor 3, electrochemical capacitor 6, first fly-wheel diode 7 and second fly-wheel diode 8 have constituted the energy-storage units of storing said farad capacitor group 1 output electric energy jointly.
Input voltage amplitude owing to MCU4 in the present embodiment is limited; So the output voltage that said inductance 5 exports in the extraneous load is carried out dividing potential drop through said resistance 9a and resistance 9b; Gather the suitable output voltage of amplitude thereby be convenient to said MCU4, thereby prevent the excessive damage of output voltage amplitude said MCU4.Can adopt the output voltage acquisition mode or the output voltage collecting unit of other kinds in addition according to the use needs.
MCU4 described in the present embodiment generates a pulse signal P; Said pulse signal P injects the said first driver 10a and the second driver 10b; Thereby control the voltage on the grid of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 respectively through the said first driver 10a and the second driver 10b; Thereby control the conducting of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 and end, promptly control in said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 conducting between the source electrode and drain electrode and end.
Said in addition MCU4 also gathers the output voltage U out that inputs to extraneous load through said voltage acquisition end B, and said MCU4 also gathers the voltage U in that said farad capacitor group 1 exports inductance 5 to.Wherein said MCU4 regulates the pulse duration W of the pulse signal P of its generation based on said Uout and Uin, for example when said Uout＞Uin, and increase pulse duration W; When said Uout＜Uin; Reduce pulse duration W, when said Uout=Uin, W is constant for the value preserving pulse duration.
Whether first metal-oxide-semiconductor 2 described in the present embodiment is used to control conducting and the disconnection between said inductance 5 and the farad capacitor group 1, promptly control said farad capacitor group 1 and said inductance 5 is charged.Said second metal-oxide-semiconductor 3 is used to control whether ground connection of said inductance 5, promptly when said inductance 5 ground connection, inductance 5 is charged, and this moment, electrochemical capacitor 6 was kept the output voltage of said output terminals A; When said inductance 5 was earth-free, said inductance 5 to extraneous load output voltage, was said electrochemical capacitor 6 electric energy supplement through said output terminals A simultaneously.Can adopt other switching device to realize conducting and shutoff and said inductance 5 ground connection whether between said inductance 5 and the farad capacitor group 1 in addition.
The operation principle of present embodiment is following:
At first, said MCU4 gathers through the output voltage U out after said resistance 9a and the resistance 9b dividing potential drop through said voltage acquisition end B, and said MCU4 also gathers the input voltage Uin in the said inductance 5 of said farad capacitor group 1 input simultaneously.
Said then MCU4 production burst signal P also regulates the pulse duration W of said pulse signal P based on the magnitude relationship between said Uout and the Uin.
After this; The said first driver 10a and the second driver 10b control the duration of the voltage on the grid of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 based on the pulse duration W of said pulse signal P; And then control said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 source electrode and the drain electrode between conducting or disconnection; Promptly in the one-period of said pulse signal P; In the time of pulse duration W, the source electrode of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 and drain electrode conducting, otherwise the source electrode of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 is connected with the drain electrode disconnection.
Thereafter when between the source electrode of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 and the drain electrode during conducting; This moment, said farad capacitor group 1, first metal-oxide-semiconductor 2, inductance 5 and second metal-oxide-semiconductor 3 constituted a loop; This moment, said farad capacitor group 1 began to said inductance 5 chargings; This moment, first fly-wheel diode 7 ended, so thereby have only electrochemical capacitor 6 discharges to keep the output voltage on the said output terminals A.
When breaking off between the source electrode of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 and the drain electrode; Break off between said farad capacitor group 1 and the said inductance 5 this moment; So said farad capacitor group 1 stops to be said inductance 5 chargings; And constitute the loop between said inductance 5, first fly-wheel diode 7, electrochemical capacitor 6, second fly-wheel diode 8; This moment, said inductance 5 discharged electric energy, and wherein a part of electric energy exports extraneous load with the form of voltage to through said output terminals A, in a part of in addition power delivery to the said electrochemical capacitor 6; Thereby replenish the electric energy in the said electrochemical capacitor 6, thus said electrochemical capacitor 6 have enough electric energy between the source electrode of said first metal-oxide-semiconductor 2 and second metal-oxide-semiconductor 3 next time and drain electrode during conducting discharge keep the output voltage of output terminals A.
Present embodiment passes through to regulate the said charging interval to said inductance 5, thereby when farad capacitor voltage is higher than output voltage, carries out lowering and stabilizing blood pressure automatically.And, transfer the voltage stabilizing of boosting automatically to when farad capacitor during smaller or equal to output voltage.Thereby make that dump energy will dwindle in the ratio of whole capacitor storing electricity further in the said farad capacitor, thereby realize making full use of of farad capacitor.
Though more than described embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited appended claims.Those skilled in the art can make numerous variations or modification to these execution modes under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (10)
1. constant voltage output device, comprise a farad capacitor, be used to store electric energy and the extraneous load of output voltage to of said farad capacitor output an energy-storage units, be used to control the switch element that conducts between said farad capacitor and the said energy-storage units or break off, a control unit that the voltage sample unit and being used to that is used to gather the voltage of said energy-storage units output generates a pulse signal of the said switch element closure or openness of control;
Wherein said farad capacitor is that said energy-storage units provides electric energy through said switch element, and said control unit is also based on the pulse duration of the said pulse signal of voltage-regulation of the voltage of said energy-storage units output and the output of said farad capacitor.
2. constant voltage output device as claimed in claim 1 is characterized in that, said constant voltage output device also comprises a plurality of farad capacitors, each farad capacitor connection parallel with one another and be that said energy-storage units provides electric energy through said switch element all.
3. according to claim 1 or claim 2 constant voltage output device is characterized in that, said energy-storage units comprises that an energy-storage travelling wave tube, an output switch module and a voltage keeps module, and said control unit also is used to control the closure or openness of said output switch module;
Wherein when said output switch module was closed, said energy-storage travelling wave tube received and stores the electric energy of said farad capacitor output, and said voltage is kept module and kept the voltage that said energy-storage units exports said extraneous load to; When said output switch module was opened, said energy-storage travelling wave tube output voltage to extraneous load was also kept the module electric energy supplement for said voltage.
4. constant voltage output device as claimed in claim 3; It is characterized in that; Said switch element comprises one first metal-oxide-semiconductor; The grid of said first metal-oxide-semiconductor is electrically connected with said control unit, and the drain electrode of said first metal-oxide-semiconductor is electrically connected with said farad capacitor, and the source electrode of said first metal-oxide-semiconductor is electrically connected with said energy-storage units.
5. constant voltage output device as claimed in claim 4 is characterized in that, said switch element also comprises one first driver that is used to drive said first metal-oxide-semiconductor, and said first driver is serially connected with between the grid and said control unit of said first metal-oxide-semiconductor.
6. constant voltage output device as claimed in claim 5; It is characterized in that; Said output switch module comprises one second metal-oxide-semiconductor; The grid of said second metal-oxide-semiconductor is electrically connected with said control unit, and the drain electrode of said second metal-oxide-semiconductor is electrically connected with said energy-storage travelling wave tube, the source ground of said second metal-oxide-semiconductor.
7. constant voltage output device as claimed in claim 6; It is characterized in that; Said output switch module also comprises one second driver that is used to drive said second metal-oxide-semiconductor, and said second driver is serially connected with between the grid and said control unit of said second metal-oxide-semiconductor.
8. like claim 6 or 7 described constant voltage output devices, it is characterized in that said voltage is kept module and comprised an electrochemical capacitor, the anode of said electrochemical capacitor is electrically connected on the drain electrode of said second metal-oxide-semiconductor, the minus earth of said electrochemical capacitor.
9. constant voltage output device as claimed in claim 8; It is characterized in that; Said voltage is kept module and is also comprised one first fly-wheel diode; Said first fly-wheel diode is serially connected with between the anode of drain electrode and said electrochemical capacitor of said second metal-oxide-semiconductor, and the anode of wherein said first fly-wheel diode is electrically connected on the drain electrode of said second metal-oxide-semiconductor, and the cathodic electricity of said first fly-wheel diode is connected in the anode of said electrochemical capacitor.
10. constant voltage output device as claimed in claim 9; It is characterized in that; Said voltage is kept module and is also comprised one second fly-wheel diode; The anode of said second fly-wheel diode is electrically connected on the source electrode of said first metal-oxide-semiconductor, and the cathodic electricity of said second fly-wheel diode is connected in the negative electrode of said electrochemical capacitor.
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| CN2011104495476A CN102570800A (en) | 2011-12-28 | 2011-12-28 | Constant-voltage output device |
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| CN2011104495476A CN102570800A (en) | 2011-12-28 | 2011-12-28 | Constant-voltage output device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104682735A (en) * | 2013-11-28 | 2015-06-03 | 德昌电机(深圳)有限公司 | Power conversion circuit |
| CN110773855A (en) * | 2019-09-20 | 2020-02-11 | 东莞市台七机械设备科技有限公司 | Energy storage spot welder device |
| CN111405719A (en) * | 2020-03-27 | 2020-07-10 | 杰华特微电子（杭州）有限公司 | BIFRED converter, control method thereof and L ED driving circuit applying BIFRED converter |
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Application publication date: 20120711 |