CN115842388A - Portable adjustable direct current stabilized voltage power supply - Google Patents
Portable adjustable direct current stabilized voltage power supply Download PDFInfo
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- CN115842388A CN115842388A CN202211093798.XA CN202211093798A CN115842388A CN 115842388 A CN115842388 A CN 115842388A CN 202211093798 A CN202211093798 A CN 202211093798A CN 115842388 A CN115842388 A CN 115842388A
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- charging
- power supply
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- 238000007600 charging Methods 0.000 claims abstract description 63
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 238000010280 constant potential charging Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052744 lithium Inorganic materials 0.000 abstract description 13
- 150000002500 ions Chemical class 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 238000007599 discharging Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 240000005561 Musa balbisiana Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention discloses a portable adjustable DC stabilized power supply, which comprises: ion battery group, buck-boost converting circuit, display screen, USB output interface that charges, wherein: the lithium ion battery pack is used for storing electric energy; the buck-boost conversion circuit is used for transmitting the input direct current of the external power adapter and the output direct current of the lithium ion battery pack; the display screen is an OLED display screen and is used for working state, voltage value, current value and battery power; the USB charging output interface is used for providing a digital product charging function. The portable adjustable direct current stabilized power supply provided by the invention is internally provided with the large-capacity lithium battery pack, can work without commercial power, adopts a synchronous voltage boosting and reducing technology, is high in working efficiency, small in heat productivity, safe and reliable, can adjust voltage and current through the knob, is simple to operate, and is intuitive and understandable in display screen indication information.
Description
Technical Field
The invention belongs to the technical field of direct current stabilized power supplies, and particularly relates to a portable adjustable direct current stabilized power supply.
Background
The invention of electricity brings rapid development to human science and technology, people can hardly leave electricity at present, digital equipment, household appliances, unmanned aerial vehicles, electric vehicles, industrial equipment and the like all work by virtue of a power supply, but the electric equipment can break down due to aging of internal elements or external factors, and various tool instruments can be used for maintaining the electric equipment, wherein the most important electric equipment is stabilized voltage power supply and electric soldering iron. The power supply voltage used in different devices is different, but basically all direct current, so that the adjustable direct current stabilized power supply plays a great role in the electrical and electronic industry. Various adjustable direct current stabilized power supplies on the market are supplied with power by alternating current, and cannot work under the condition of no commercial power. At present, the outdoor environment generally adopts modes such as oil engine power generation, vehicle-mounted inverter and the like, but the outdoor environment is heavy and inconvenient to carry and is also not favorable for protecting the environment.
Disclosure of Invention
The invention aims to provide a portable adjustable direct current stabilized power supply to solve the problems in the prior art.
In order to achieve the above object, the present invention provides a portable adjustable dc voltage-stabilized power supply, comprising:
the device comprises a lithium ion battery pack, a buck-boost conversion circuit, a display screen and a USB charging output interface;
the lithium ion battery pack is used for storing electric energy;
the buck-boost conversion circuit is used for transmitting the input direct current of an external power adapter and the output direct current of the lithium ion battery pack;
the display screen is an OLED display screen and is used for working state, voltage value, current value and battery power;
the USB charging output interface is used for providing a digital product charging function.
Optionally, the lithium ion battery pack adopts a CC-CV charging mode, and comprises three charging stages of trickle charging, constant-current quick charging and constant-voltage charging.
Optionally, when the lithium ion battery pack is in the trickle charge stage, charging with 10% of low current;
when the lithium ion battery pack is in a constant-current quick-charging stage, the battery voltage of the lithium ion battery pack reaches a quick-charging threshold, and the charging current is 100%;
when the lithium ion battery pack is in a constant voltage charging stage, the battery voltage of the lithium ion battery pack reaches a full cut-off voltage, and the charging current is reduced;
and when the battery voltage of the lithium ion battery pack is reduced to the recharging threshold voltage, the charging process is carried out again.
Optionally, the buck-boost conversion circuit adopts a bidirectional charging and discharging technology, and a synchronous buck-boost function is realized by driving a switching tube through a PWM signal.
Optionally, the buck-boost conversion circuit includes a boost topology and a buck topology, and the boost topology and the buck topology respectively include two switching tubes.
Optionally, the buck-boost conversion circuit includes a buck mode, a boost mode, and a buck-boost mode;
when the input voltage is higher than the output voltage, entering a boosting working mode; entering a buck mode when the input voltage is greater than the output voltage; enter buck-boost mode when the input voltage equals the output voltage.
Optionally, when the buck-boost conversion circuit enters the buck working mode, two switching tubes in the buck topology of the buck-boost conversion circuit are of opposite PWM waveforms, and two switching tubes in the boost topology are one high and one low.
Optionally, the buck-boost operating mode includes a buck-boost state and a boost-buck state;
when the switching tube is in a voltage reduction-to-voltage increase state, the time sequence of the switching tube in the voltage reduction topology is advanced by 120 degrees than the time sequence of the switching tube in the voltage increase topology;
when in the boost-to-buck state, the timing of the switching tubes in the buck topology lags the timing of the switching tubes in the boost topology by 120 °.
Optionally, when the buck-boost conversion circuit enters the boost working mode, two switching tubes in the boost topology of the buck-boost conversion circuit are of opposite PWM waveforms, and two switching tubes in the buck topology are one high and one low.
Optionally, the USB charging output interface adopts a full-protocol compatible charging technology, and includes two paths of output circuits that do not affect each other, and the maximum output power of the output circuit is 30W
The invention has the technical effects that:
1. the portable adjustable direct current stabilized power supply provided by the invention is internally provided with a large-capacity lithium battery pack, can work without commercial power and works all day long.
2. And a synchronous buck-boost technology is adopted, so that the working efficiency is high, the heat productivity is small, and the device is safe and reliable.
3. Voltage and current can be adjusted through the knob, operation is simple, and display screen indication information is visual and understandable.
4. The aluminum alloy section bar shell is firm, durable, safe and reliable, and meets the outdoor use environment.
5. The charging input meets the requirements of a conventional vehicle-mounted power supply or a power adapter, and the charging is convenient and quick. The USB output interface with various charging protocols is suitable for quick charging of the mobile phone.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a block diagram of a portable adjustable DC voltage regulator system according to an embodiment of the present invention;
FIG. 2 is a synchronous buck-boost topology diagram in an embodiment of the present invention;
FIG. 3 is a diagram illustrating a step-down mode of operation of the synchronous buck-boost power supply according to an embodiment of the present invention;
fig. 4 is a diagram of a buck-boost transition mode in an embodiment of the invention, in which (a) is a diagram of a buck-boost mode when an input voltage is greater than or equal to an output voltage, and (b) is a diagram of a buck-boost mode when the input voltage is less than or equal to the output voltage;
FIG. 5 is a diagram illustrating a boost operation mode according to an embodiment of the present invention;
FIG. 6 is a graph illustrating a charging curve of a lithium battery according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a circuit in an embodiment of the invention;
fig. 8 is a schematic structural diagram of an external shape of a portable adjustable dc voltage-stabilized power supply in an embodiment of the invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than here.
Example one
As shown in fig. 1-8, the present embodiment provides a portable adjustable dc voltage regulator.
According to the voltage range commonly used by various equipment mainboards, the integrated design is realized by adopting the lithium ion battery pack with mature technology and the synchronous buck-boost power supply topology and combining the digital analog processing technology, and the performance indexes of small power, low ripple, light weight, small size and the like.
The working principle of the invention is composed of five parts, as shown in figure 1: the lithium ion battery pack, the buck-boost conversion circuit, the operation processing control circuit, the buck conversion circuit, the display screen and the auxiliary pack circuit. 12V/24V direct current input by the external power adapter is used for charging the lithium ion battery pack through the synchronous buck-boost power conversion circuit. The electric energy stored by the lithium ion battery pack is converted into stable direct current for output through the synchronous buck-boost conversion circuit. The other path of electric energy provided by the lithium ion battery pack is supplied to the synchronous buck conversion circuit and is supplied to the USB output interface through the multiple protocol identification circuits, so that the charging of different mobile phone devices is met. The display screen adopts OLED, can show operating condition and voltage, current value. The illuminating lamp adopts a constant current driving LED circuit, and can provide convenient operation for emergency illumination.
The buck-boost conversion circuit adopts the latest bidirectional charging and discharging technology, the controller drives 4 switching tubes through PWM signals to realize the synchronous buck-boost function, the conversion efficiency is high, the input voltage range is wide, and the buck-boost conversion circuit is suitable for charging a 12V/24V vehicle-mounted power supply or a power adapter. The synchronous buck-boost power conversion topology is shown in fig. 2, wherein a Vin end is used as power input during charging, a Vout end is used as a battery pack, switch tubes A and B form a buck topology, and switch tubes C and D form a boost topology. And the Vin end is a battery pack during discharging at the moment, and the Vout end is power output. The switching tubes D and C form a voltage reduction topology, and the switching tubes B and A form a voltage boosting topology.
The synchronous buck-boost power supply conversion topology has three working modes, namely buck, boost and buck-boost. When the input voltage is higher than the output voltage, the voltage boosting mode is adopted, when the input voltage is higher than the output voltage, the voltage reducing mode is adopted, when the input voltage is equal to the output voltage, the voltage boosting mode is adopted, and waveforms of 4 switching tubes corresponding to three different modes are different.
When in the buck mode, as shown in fig. 3, the switching tubes a and B are opposite PWM to form a synchronous buck topology, the switching tube C is low and does not work, the switching tube D is high and serves as an ideal diode, the waveform on the inductor is sawtooth chopping, and the duty ratio corresponds to the PWM waveform of the tube a.
When in buck-boost transition mode, there are two states, buck-boost or boost-buck, the P primary waveforms are shown in fig. 4a and 4b, respectively. In both cases, the four switching tubes operate simultaneously, with only a slight difference in timing. When the voltage is reduced and increased, the time sequence of the switch tubes A and B is advanced by 120 degrees than that of the switch tubes C and D. The switching tubes A and B lag behind the timing sequence of the switching tubes C and D by 120 DEG when the voltage rises and falls.
When in the boost mode, as shown in fig. 5, the switching tubes C and D are opposite PWM to form a synchronous boost topology, the switching tube B is low and does not work, the switching tube a is high and serves as an ideal diode, the waveform on the inductor is sawtooth chopping, and the duty ratio corresponds to the PWM waveform of the C tube.
The battery pack adopts a 18650 lithium ion battery with mature technology, has the advantages of high specific energy, light weight, low internal resistance, small heat productivity, convenient use and maintenance, safety, reliability and the like, and has the rated voltage of 18.5V and the rated capacity of 10Ah according to a combined structure of 5 strings and 4 parallel batteries.
The lithium ion battery pack generally employs a CC-CV charging mode, and the entire charging process has 3 stages, each of which is related to the voltage of the battery pack, as shown in fig. 6 below. Such a mode can extend the service life of the battery and protect the battery from damage. Stage 1 is trickle charging, which will charge the lithium battery with 10% of low current when the voltage of the lithium battery is lower than the fast charging threshold. And in the stage 2, in the constant-current quick-charging stage, the voltage of the lithium battery reaches a quick-charging threshold along with the rise of the voltage of the lithium battery, and the charging current is 100 percent. The 3 rd stage is constant voltage charging, and as the voltage of the lithium battery rises, the voltage of the lithium battery reaches a full-charge cut-off voltage, and the charging current begins to decrease. When the charging current decreases to the cutoff current threshold. The lithium battery is now fully charged and the charging process is complete. When the voltage of the lithium battery is placed or discharged for working for a long time, the voltage of the lithium battery is reduced, and when the voltage is reduced to a recharging threshold voltage, namely 98%, a new charging process is started.
The invention also has a USB charging output interface, which is convenient for users to charge digital products such as mobile phones and the like. In consideration of the rapid development of the existing charging technology, many digital devices have a quick charging function, so that the charging time can be greatly shortened. The survey finds that the current charging protocols mainly comprise: BC1.2, high-pass QC protocol, apple PE protocol, samsung AFC, huashang FCP and SCP, VOOC low-voltage fast charge, super flash charge and the like. The invention adopts a special IC integrating various protocols to realize the full-protocol compatible charging technology. Two ways of USB output work independently, and the single way can realize the output of maximum 30W and not influence each other.
In order to better and more intuitively know the working state of the portable adjustable direct current stabilized power supply, the invention uses the high and low temperature resistant OLED display screen to indicate the working state, the voltage value, the current value and the battery power. The working principle diagram of the portable adjustable DC stabilized power supply is shown in the following figure 7.
The portable multifunctional desk is convenient to carry, and has the characteristics of small size, light weight and compact internal layout structure. The outline structure is shown in fig. 8. The overall arrangement of front panel at first, output socket adopts 4mm banana socket and constant voltage power supply's output form unanimous commonly used, and voltage current adjust knob installs and conveniently use in the upper left corner and do not shelter from the sight, and operating condition and parameter are conveniently looked over at the upper left corner to the display screen, and the lower right corner is total button switch. The back panel has an LED lamp and its button switch, and a power input socket interface for charging the internal battery. The shell is made of high-hardness aluminum alloy, and has the characteristics of good heat dissipation, light weight, firmness and durability.
All devices used in the embodiment are domestic devices, core components of the control part are MOS (metal oxide semiconductor) tubes and driving ICs (integrated circuits), devices with the same function have various types in domestic brands, and if foreign devices are used, the types are replaced more.
The invention adopts the latest four-switch synchronous buck-boost conversion power supply topology, and a special control mode can realize charging and discharging, so that the size of the circuit board is reduced, the conversion efficiency is improved, the input voltage range is wide, and the power supply is suitable for charging in various environments. The auxiliary output USB interface has various fast charging protocols and is compatible with most smart phones and digital products on the market. The adjustable voltage-stabilized power supply is compact in structural design, small in size, light in weight and convenient to carry, has built-in lithium battery pack power supply compared with an adjustable voltage-stabilized power supply on the market, and meets the outdoor maintenance and debugging work requirement.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A portable adjustable DC stabilized power supply is characterized by comprising: the device comprises a lithium ion battery pack, a buck-boost conversion circuit, a display screen and a USB charging output interface;
the lithium ion battery pack is used for storing electric energy;
the buck-boost conversion circuit is used for transmitting the input direct current of an external power adapter and the output direct current of the lithium ion battery pack;
the display screen is an OLED display screen and is used for working state, voltage value, current value and battery electric quantity;
the USB charging output interface is used for providing a digital product charging function.
2. The portable adjustable DC voltage-stabilized power supply according to claim 1, wherein the lithium ion battery pack adopts a CC-CV charging mode, which comprises three charging stages of trickle charging, constant-current fast charging and constant-voltage charging.
3. The regulated portable regulated dc power supply according to claim 2 wherein said lithium ion battery pack is charged at a trickle charge level with 10% trickle charge;
when the lithium ion battery pack is in a constant-current quick-charging stage, the battery voltage of the lithium ion battery pack reaches a quick-charging threshold, and the charging current is 100%;
when the lithium ion battery pack is in a constant voltage charging stage, the battery voltage of the lithium ion battery pack reaches a full cut-off voltage, and the charging current is reduced;
and when the battery voltage of the lithium ion battery pack is reduced to the recharging threshold voltage, the charging process is carried out again.
4. The portable adjustable DC voltage-stabilized power supply according to claim 1, wherein the buck-boost conversion circuit adopts a bidirectional charge-discharge technology, and a switching tube is driven by a PWM signal to realize a synchronous buck-boost function.
5. The portable adjustable DC voltage-stabilized power supply according to claim 1, wherein the buck-boost conversion circuit comprises a boost topology and a buck topology, and the boost topology and the buck topology respectively comprise two switching tubes.
6. The portable adjustable DC stabilized power supply according to claim 1, wherein the buck-boost conversion circuit comprises a buck mode, a boost mode, and a buck-boost mode;
when the input voltage is higher than the output voltage, entering a boosting working mode; entering a buck mode when the input voltage is greater than the output voltage; enter buck-boost mode when the input voltage equals the output voltage.
7. The portable adjustable dc regulated power supply according to claim 6 wherein when the buck-boost converter enters the buck mode of operation, the two switching transistors in the buck topology of the buck-boost converter have opposite PWM waveforms, and the two switching transistors in the boost topology have a high one and a low one.
8. The portable adjustable regulated dc power supply according to claim 6, wherein the buck-boost operating mode comprises a buck-boost state and a boost-buck state;
when the switching tube is in a voltage reduction-to-voltage boosting state, the time sequence of the switching tube in the voltage reduction topology is advanced by 120 degrees than that of the switching tube in the voltage boosting topology;
when in the boost-to-buck state, the timing of the switching tubes in the buck topology lags the timing of the switching tubes in the boost topology by 120 °.
9. The portable adjustable dc regulated power supply according to claim 6, wherein when the buck-boost converter circuit enters the boost operating mode, two switching tubes in the boost topology of the buck-boost converter circuit have opposite PWM waveforms, and two switching tubes in the buck topology have one high and one low.
10. The portable adjustable DC voltage-stabilized source according to claim 1, wherein the USB charging output interface adopts a full protocol compatible charging technology, and comprises two paths of output circuits which are not affected with each other, and the maximum output power of the output circuits is 30W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211093798.XA CN115842388A (en) | 2022-09-08 | 2022-09-08 | Portable adjustable direct current stabilized voltage power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211093798.XA CN115842388A (en) | 2022-09-08 | 2022-09-08 | Portable adjustable direct current stabilized voltage power supply |
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| CN115842388A true CN115842388A (en) | 2023-03-24 |
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| CN202211093798.XA Pending CN115842388A (en) | 2022-09-08 | 2022-09-08 | Portable adjustable direct current stabilized voltage power supply |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829055A (en) * | 2005-03-02 | 2006-09-06 | 富士通株式会社 | DC-DC converter, DC-DC converter control apparatus, power supply apparatus, electronic equipment and control method for dc-dc converter |
| CN105518969A (en) * | 2013-09-09 | 2016-04-20 | 苹果公司 | Battery charger with buck-boost operation |
| CN206673616U (en) * | 2017-03-09 | 2017-11-24 | 湖南海翼电子商务股份有限公司 | Compact power |
| CN210379328U (en) * | 2019-08-28 | 2020-04-21 | 深圳市圭石南方科技发展有限公司 | Battery charging system |
| CN212849883U (en) * | 2020-03-17 | 2021-03-30 | 北京和众视野科技有限公司 | Lithium battery charging and discharging management and electric quantity display protection device |
-
2022
- 2022-09-08 CN CN202211093798.XA patent/CN115842388A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829055A (en) * | 2005-03-02 | 2006-09-06 | 富士通株式会社 | DC-DC converter, DC-DC converter control apparatus, power supply apparatus, electronic equipment and control method for dc-dc converter |
| CN105518969A (en) * | 2013-09-09 | 2016-04-20 | 苹果公司 | Battery charger with buck-boost operation |
| CN206673616U (en) * | 2017-03-09 | 2017-11-24 | 湖南海翼电子商务股份有限公司 | Compact power |
| CN210379328U (en) * | 2019-08-28 | 2020-04-21 | 深圳市圭石南方科技发展有限公司 | Battery charging system |
| CN212849883U (en) * | 2020-03-17 | 2021-03-30 | 北京和众视野科技有限公司 | Lithium battery charging and discharging management and electric quantity display protection device |
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