CN104935164A - Direct current converter capable of outputting positive and negative voltage - Google Patents
Direct current converter capable of outputting positive and negative voltage Download PDFInfo
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- CN104935164A CN104935164A CN201410104733.XA CN201410104733A CN104935164A CN 104935164 A CN104935164 A CN 104935164A CN 201410104733 A CN201410104733 A CN 201410104733A CN 104935164 A CN104935164 A CN 104935164A
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Abstract
The invention relates to the technical field of direct current converters, particularly to a direct current converter capable of outputting positive and negative voltage. A voltage value input by a voltage input end V-in of the converter passes through a switching tube and is provided to two output branches isolated by an isolation branch at the same time, one of the output branches and the voltage input end V-in form a boost conversion circuit or a buck conversion circuit which performs voltage stabilization operation of voltage boosting/voltage reduction on input voltage to output voltage having the same polarity as the voltage input end V-in, the other output branch and the voltage input end V-in form a buck-boost conversion circuit which performs polarity reversal and voltage boosting/voltage reduction on the input voltage to output voltage with polarity opposite to the voltage input end V-in. The circuit can realize two voltage outputs by adoption of one PWM chip, and can effectively reduce the usage amount of PWM chips while satisfying component requirements, thereby saving cost.
Description
Technical field
The invention relates to DC converter technical field, particularly the DC converter of exportable generating positive and negative voltage.
Background technology
In modern electronic equipment, the components and parts related to become increasingly complex, and more and more accurate, the power supply that many components and parts need electronic equipment to provide stable for it, such as, form the primary element operational amplifier of the tandem circuit such as sample circuit, modulate circuit.Because the stability requirement of these components and parts to power supply is higher, certain power circuit therefore must be adopted to provide reliable power supply for it.Direct current (DC-DC) converter is the power circuit commonly used in the electronic device.
DC converter generally adopts isolation type switching power supply circuit, such as boost(boosting) circuit, buck(step-down) circuit and buck-boost(buck) circuit, wherein boost circuit is stable after being used for carrying out boosting to the voltage of input exports, buck circuit is used for exporting stable after input voltage step-down, and buck-boost circuit exports at step-up/down after being used for carrying out polarity upset to input voltage.Isolation type switching power supply circuit has switching tube, is carried out the ON/OFF of the switching tube of control switch pipe by a PWM module, realizes the object that regulation voltage exports.
At present, a DC converter generally can only provide a kind of voltage, but in the electronic device, because components and parts type is various, it is also not quite similar to the requirement of power supply, some components and parts needs electronic equipment to provide positive supply for it, and some needs to provide negative supply for it, and its power supply required of such as dissimilar operational amplifier is just different.Therefore, generally need employing two converters in the electronic device, one is used for exporting positive voltage, one is used for exporting negative voltage, because a converter circuit needs a PWM module, and in each PWM module, need employing PWM chip, therefore, in current electronic equipment, at least need outfit two PWM chip, cause product cost higher.
Summary of the invention
The object of the invention is to provide a kind of DC converter utilizing a PWM module simultaneously can export positive voltage and negative voltage, thus can reduce the use of PWM chip, reduces production cost.
Provide the DC converter of exportable generating positive and negative voltage for this reason, comprise voltage input end V-in and PWM switch module, described PWM switch module is according to its inner pwm signal produced periodically conduction and cut-off, it is characterized in that: also comprise the first output branch road and second and export branch road, voltage input end Vin exports branch road through PWM switch module and first and forms boost translation circuit or buck translation circuit, voltage input end Vin exports branch road through PWM switch module and second and forms buck-boost translation circuit and make the second output branch road export the voltage of opposite polarity, first output branch road and second exports between branch road and is provided with buffer circuit.
Wherein, PWM switch module regulates its conduction and cut-off cycle according to the output feedack that first exports branch road and/or the second output branch road.
Wherein, PWM switch module regulates its conduction and cut-off cycle according to the output feedack that first exports branch road.
Wherein, first exports branch road and second exports in the middle of branch road, and the output feedback signal of an output branch road is to PWM switch module to regulate the conduction and cut-off cycle of PWM switch module, and another output exporting branch road is connected with voltage stabilizing chip.
Wherein, described buffer circuit comprises diode D2, first input and second exporting branch road exports in the input of branch road, and the input that current potential is high when the conducting of PWM switch module is connected with the negative pole of diode D2, and one end that current potential is low is connected with the positive pole of diode D2.
Wherein, first exports branch road forms buck translation circuit through PWM switch module and voltage input end Vin, it comprises diode D1, energy storage inductor L1, input capacitance C2 and the first voltage output end V1, described energy storage inductor L1 forms the first supply access when the conducting of PWM switch module through PWM switch module connection voltage input end V-in and powers to the first voltage output end V1, energy storage inductor L1 forms second supply access with connecting power supply when PWM switch module closes through diode D1 and powers to the first voltage output end V1, input capacitance C2 one end is connected with the first voltage output end V1, the other end is connected with power supply ground.
Wherein, second exports branch road comprises diode D3, energy storage inductor L2, input capacitance C4 and the second voltage output end V2, energy storage inductor L2 is communicated with voltage input end V-in when the conducting of PWM switch module through PWM switch module and forms energy storage path to inductance L 2 storage of electrical energy, described energy storage inductor L2 forms supply access with connecting power supply when PWM switch module closes through diode D3 and powers to the second voltage output end V2, input capacitance C4 one end is connected with the second voltage output end V2, and the other end is connected with power supply ground.
The beneficial effect of the invention: the invention provides a kind of DC converter, the magnitude of voltage that the voltage input end V-in of this converter inputs is supplied to two output branch roads being isolated branch road and keeping apart after switching tube simultaneously, one of them exports branch road and voltage input end V-in forms boost translation circuit or buck translation circuit, it exports the voltage identical with voltage input end V-in polarity after carrying out the voltage stabilizing operations such as lifting/voltage reducing to the voltage of input, another exports branch road and voltage input end V-in forms buck-boost translation circuit, it carries out polarity upset to the voltage of input and exports and the opposite polarity voltage of voltage input end V-in after lifting/voltage reducing, owing to there is isolation branch road, two output branch roads can not disturb mutually, effective guarantee two output branch roads effectively work.This circuit achieves two kinds of voltages (positive voltage and negative voltage) and exports in a converter, namely adopts a PWM chip can realize two kinds of voltages and exports, effectively can reduce the use amount of PWM chip, saved cost while meeting components and parts demand.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the DC converter of exportable generating positive and negative voltage.
Embodiment
The DC converter of exportable generating positive and negative voltage as shown in Figure 1, in the present embodiment, PWM switch module adopts control chip U1, control chip U1 is specially MC34063 cake core, this integrated chip PWM chip and the switching tube that controls by PWM chip, 1 pin of this chip can be considered the collector electrode of switching tube, 2 pin of this chip can be considered the emitter of switching tube, the base stage (namely controlling pole) of switching tube makes between its collector and emitter according to pwm control signal periodically conduction and cut-off with being connected with PWM chip at chip internal, namely 1 pin of control chip U1 and 2 pin are according to the pwm signal periodically conduction and cut-off of control chip U1 inside.According to actual conditions, also can select and there is no the PWM chip of integrated switch pipe and a switching tube be connected with PWM chip to form function and the similar PWM switch module of control chip U1.
Particularly, the structure of this circuit is that 1 pin of control chip U1 is connected with the voltage input end Vin of positive pole through resistance R3, what the emitter of control chip U1 was formed with by diode D1, energy storage inductor L1, input capacitance C2 and the first voltage output end V1 on the one hand after isolating diode D2 first exports branch road 1 and is connected, and what the opposing party was formed with by diode D3, energy storage inductor L2, input capacitance C4 and the second voltage output end V2 second exports branch road 2 and be connected.
Can learn significantly from Fig. 1, first exports branch road 1 forms buck translation circuit through the built-in switching tube of control chip U1 and voltage input end Vin.When the switching tube conducting that control chip U1 is built-in, the voltage that voltage input end Vin inputs is loaded into the left end of energy storage inductor L1 by resistance R3, switching tube and isolating diode D2, diode D1 is in reverse-bias state.Because the pressure drop of resistance R3 and switching tube is very low, ignore at this.If the magnitude of voltage of voltage input end Vin is Vin, the magnitude of voltage of the first voltage output end V1 is V1, then the voltage be loaded on energy storage inductor L1 is VL=Vin-V1.If the ON time of switching tube is t1, during this period, inductive current linearly rises, and the energy part that inputting provides is supplied to load through the first voltage output end, and another part is stored in energy storage inductor L1.
When switching tube ends, according to Faraday's law, induced electromotive force polarity inversion on energy storage inductor L1, diode D1 conducting, the current potential of energy storage L1 left end reduces to earth potential, the energy transferring that energy storage L1 stores is to the first voltage output end, if the ON time of switching tube is t2, then the pass of output voltage and input voltage is:
, in formula, D is duty ratio, namely
.
In the present embodiment, the first branch road adopts the hypotensive effect of buck translation circuit realization to input voltage, as required, boost circuit also can be adopted to export after input voltage boosting.
Can also learn significantly from Fig. 1, second exports branch road 2 forms buck-boost translation circuit through the built-in switching tube of control chip U1 and voltage input end Vin.When switching tube conducting, the voltage that voltage input end Vin inputs is loaded into the upper end of energy storage inductor L2 by resistance R3, switching tube, because diode D3 oppositely ends, the electric current of energy storage inductor L2 linearly rises, storage power.When Q1 ends, the induced electromotive force polarity inversion at energy storage inductor L2 two ends, energy storage L2 upper end becomes negative value, diode D3 conducting, as described above simultaneously, now energy storage inductor L1 left end is ground level, and therefore isolating diode D2 ends, energy storage inductor L2 by store energy transferring to the second voltage output end V2.Concrete, the pass of the output voltage Vo2 of the second voltage output end V2 and the input voltage vin of voltage input end Vin is:
.According to the relation of V1 and input voltage, can release:
.
It should be noted that, the connection of isolating diode D2 is not unique, this connection is adopted to determine according to physical circuit, its Main Function isolates two-way to export branch road (voltage influence that the inductance mainly avoiding two-way to export branch road produces exports branch road to another) when switching tube conducting, those skilled in the art can adjust according to physical circuit, as long as can realize above object.
In addition, the polarity connected in the present embodiment is positive voltage input end Vin, but also can connect polarity is in actual use negative voltage input end Vin, as long as adjust accordingly circuit structure, does not repeat them here.
Also there is bleeder circuit in the present embodiment that be made up of resistance R1 and resistance R2, control chip U1 is fed back to after its voltage exported by the first voltage output end carries out dividing potential drop, control chip U1 regulates pwm signal to export according to this feedback, and namely the ON/OFF of by-pass cock pipe controls.The output voltage of the first voltage output end can be made according to stable by this feedback regulation, effectively can meet the demand of each components and parts.Certainly, control chip U1 is fed back to because the second voltage output end is not outputed signal, its stability exported is not as the first voltage output end, to this, a voltage stabilizing chip can be connected at the second voltage output end, such as 7905 or 7912 chip (not shown), carry out voltage stabilizing process to the output voltage of the second voltage output end, ensure its output stability.
Certainly, according to actual needs, also can to control chip U1, the first voltage output end carry out the scheme fed back by the Voltage Feedback of the second voltage output end, its effect and the present embodiment are also consistent, do not repeat them here.In addition, can also sample the voltage of two voltage output ends as feedback signal, but this mode intersects adjustment due to needs, and the output accuracy of two outputs is than low when only adopting a road feedback simultaneously, and circuit is more complicated, practicality is not as good as the scheme in the present embodiment.
Claims (7)
1. the DC converter of exportable generating positive and negative voltage, comprise voltage input end V-in and PWM switch module, described PWM switch module is according to its inner pwm signal produced periodically conduction and cut-off, it is characterized in that: also comprise the first output branch road and second and export branch road, voltage input end Vin exports branch road through PWM switch module and first and forms boost translation circuit or buck translation circuit, voltage input end Vin exports branch road through PWM switch module and second and forms buck-boost translation circuit and make the second output branch road export the voltage of opposite polarity, first output branch road and second exports between branch road and is provided with buffer circuit.
2. the DC converter of exportable generating positive and negative voltage as claimed in claim 1, is characterized in that: PWM switch module exports branch road according to first and/or the second output feedack exporting branch road regulates its conduction and cut-off cycle.
3. the DC converter of exportable generating positive and negative voltage as claimed in claim 2, is characterized in that: PWM switch module regulates its conduction and cut-off cycle according to the output feedack that first exports branch road.
4. the DC converter of exportable generating positive and negative voltage as claimed in claim 1, it is characterized in that: first exports branch road and second exports in the middle of branch road, output branch road output feedback signal is to PWM switch module to regulate the conduction and cut-off cycle of PWM switch module, and another output exporting branch road is connected with voltage stabilizing chip.
5. the DC converter of exportable generating positive and negative voltage as claimed in claim 1, it is characterized in that: described buffer circuit comprises diode D2, first input and second exporting branch road exports in the input of branch road, the input that current potential is high when the conducting of PWM switch module is connected with the negative pole of diode D2, and one end that current potential is low is connected with the positive pole of diode D2.
6. the DC converter of exportable generating positive and negative voltage as claimed in claim 1, it is characterized in that: first exports branch road forms buck translation circuit through PWM switch module and voltage input end Vin, it comprises diode D1, energy storage inductor L1, input capacitance C2 and the first voltage output end V1, described energy storage inductor L1 forms the first supply access when the conducting of PWM switch module through PWM switch module connection voltage input end V-in and powers to the first voltage output end V1, energy storage inductor L1 forms second supply access with connecting power supply when PWM switch module closes through diode D1 and powers to the first voltage output end V1, input capacitance C2 one end is connected with the first voltage output end V1, the other end is connected with power supply ground.
7. the DC converter of exportable generating positive and negative voltage as claimed in claim 1, it is characterized in that: second exports branch road comprises diode D3, energy storage inductor L2, input capacitance C4 and the second voltage output end V2, energy storage inductor L2 is communicated with voltage input end V-in when the conducting of PWM switch module through PWM switch module and forms energy storage path to inductance L 2 storage of electrical energy, described energy storage inductor L2 forms supply access with connecting power supply when PWM switch module closes through diode D3 and powers to the second voltage output end V2, input capacitance C4 one end is connected with the second voltage output end V2, the other end is connected with power supply ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410104733.XA CN104935164A (en) | 2014-03-20 | 2014-03-20 | Direct current converter capable of outputting positive and negative voltage |
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| CN201410104733.XA CN104935164A (en) | 2014-03-20 | 2014-03-20 | Direct current converter capable of outputting positive and negative voltage |
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| CN104935164A true CN104935164A (en) | 2015-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112054679A (en) * | 2020-09-11 | 2020-12-08 | 国网智能科技股份有限公司 | Positive and negative voltage conversion direct-current power supply and control method thereof |
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| CN101632984A (en) * | 2008-07-24 | 2010-01-27 | Ge医疗***环球技术有限公司 | Voltage generator circuit and ultrasonic diagnostic equipment |
| TW201220658A (en) * | 2010-11-05 | 2012-05-16 | Univ Nat Taipei Technology | for boosting the voltages at the positive and negative output terminals |
| CN102688069A (en) * | 2011-02-04 | 2012-09-26 | Ge医疗***环球技术有限公司 | Ultrasonic image display apparatus power circuit and ultrasonic image display apparatus |
| CN102801319A (en) * | 2012-06-15 | 2012-11-28 | 张太平 | Direct current step-down switch |
| CN203761267U (en) * | 2014-03-20 | 2014-08-06 | 广东易事特电源股份有限公司 | Direct-current converter capable of outputting positive and negative voltage |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070273306A1 (en) * | 2006-05-24 | 2007-11-29 | Takashi Fujino | LED Lighting Apparatus |
| CN101632984A (en) * | 2008-07-24 | 2010-01-27 | Ge医疗***环球技术有限公司 | Voltage generator circuit and ultrasonic diagnostic equipment |
| TW201220658A (en) * | 2010-11-05 | 2012-05-16 | Univ Nat Taipei Technology | for boosting the voltages at the positive and negative output terminals |
| CN102688069A (en) * | 2011-02-04 | 2012-09-26 | Ge医疗***环球技术有限公司 | Ultrasonic image display apparatus power circuit and ultrasonic image display apparatus |
| CN102801319A (en) * | 2012-06-15 | 2012-11-28 | 张太平 | Direct current step-down switch |
| CN203761267U (en) * | 2014-03-20 | 2014-08-06 | 广东易事特电源股份有限公司 | Direct-current converter capable of outputting positive and negative voltage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112054679A (en) * | 2020-09-11 | 2020-12-08 | 国网智能科技股份有限公司 | Positive and negative voltage conversion direct-current power supply and control method thereof |
| CN112054679B (en) * | 2020-09-11 | 2021-09-17 | 山东鲁软数字科技有限公司智慧能源分公司 | Positive and negative voltage conversion direct-current power supply and control method thereof |
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Application publication date: 20150923 |